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High Harmonic Generation by Bright Squeezed Vacuum (2403.15337v2)
Published 22 Mar 2024 in quant-ph and physics.optics
Abstract: We observe non-perturbative high harmonic generation in solids driven by a macroscopic quantum state of light, bright squeezed vacuum (BSV), which we generate in a single spatiotemporal mode. The BSV-driven process is considerably more efficient in the generation of high harmonics than classical light of the same mean intensity. Due to its broad photon-number distribution, covering states from $0$ to $2 \times 10{13}$ photons per pulse, and sub-cycle electric field fluctuations over $\pm1\hbox{V}/\hbox{\r{A}}$, BSV provides access to free carrier dynamics within a much broader range of peak intensities than accessible with classical light. Our findings contribute to recent developments of quantum optics with extreme intensities, moving beyond its traditional focus on low photon numbers, and providing a new method for exploring extreme nonlinearities in solids.
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[2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Krausz, F., Ivanov, M.: Attosecond physics. Rev. Mod. Phys. 81, 163–234 (2009) https://doi.org/10.1103/RevModPhys.81.163 Popmintchev et al. [2012] Popmintchev, T., Chen, M.-C., Popmintchev, D., Arpin, P., Brown, S., Ališauskas, S., Andriukaitis, G., Balčiunas, T., Mücke, O.D., Pugzlys, A., Baltuška, A., Shim, B., Schrauth, S.E., Gaeta, A., Hernández-García, C., Plaja, L., Becker, A., Jaron-Becker, A., Murnane, M.M., Kapteyn, H.C.: Bright coherent ultrahigh harmonics in the kev x-ray regime from mid-infrared femtosecond lasers. Science 336(6086), 1287–1291 (2012) https://doi.org/10.1126/science.1218497 Ghimire et al. [2011] Ghimire, S., DiChiara, A.D., Sistrunk, E., Agostini, P., DiMauro, L.F., Reis, D.A.: Observation of high-order harmonic generation in a bulk crystal. Nature Physics 7, 138–141 (2011) https://doi.org/10.1038/nphys1847 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Klug, D.D., Corkum, P.B.: All-optical reconstruction of crystal band structure. Phys. Rev. Lett. 115, 193603 (2015) https://doi.org/10.1103/PhysRevLett.115.193603 Goulielmakis and Brabec [2022] Goulielmakis, E., Brabec, T.: High harmonic generation in condensed matter. Nature Photonics 16(6), 411–421 (2022) https://doi.org/10.1038/s41566-022-00988-y Hentschel et al. [2001] Hentschel, M., Kienberger, R., Spielmann, C., Reider, G.A., Brabec, T., Corkum, P., Heinzmann, U., Drescher, M., Krausz, F.: Attosecond metrology. Nature 414, 509–513 (2001) https://doi.org/10.1038/35107000 Paul et al. [2001] Paul, P.M., Toma, E.S., Breger, P., Mullot, G., Augé, F., Balcou, P., Muller, H.G., Agostini, P.: Observation of a train of attosecond pulses from high harmonic generation. Science 292(5522), 1689–1692 (2001) https://doi.org/10.1126/science.1059413 Corkum [1993] Corkum, P.B.: Plasma perspective on strong field multiphoton ionization. Phys. Rev. Lett. 71(13), 1994–1997 (1993) https://doi.org/10.1103/PhysRevLett.71.1994 Lewenstein et al. [1994] Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Goulielmakis, E., Brabec, T.: High harmonic generation in condensed matter. Nature Photonics 16(6), 411–421 (2022) https://doi.org/10.1038/s41566-022-00988-y Hentschel et al. [2001] Hentschel, M., Kienberger, R., Spielmann, C., Reider, G.A., Brabec, T., Corkum, P., Heinzmann, U., Drescher, M., Krausz, F.: Attosecond metrology. Nature 414, 509–513 (2001) https://doi.org/10.1038/35107000 Paul et al. [2001] Paul, P.M., Toma, E.S., Breger, P., Mullot, G., Augé, F., Balcou, P., Muller, H.G., Agostini, P.: Observation of a train of attosecond pulses from high harmonic generation. Science 292(5522), 1689–1692 (2001) https://doi.org/10.1126/science.1059413 Corkum [1993] Corkum, P.B.: Plasma perspective on strong field multiphoton ionization. Phys. Rev. Lett. 71(13), 1994–1997 (1993) https://doi.org/10.1103/PhysRevLett.71.1994 Lewenstein et al. [1994] Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. 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[2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. 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[2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. 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[2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. 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[2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. 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[2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. 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[2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Hentschel, M., Kienberger, R., Spielmann, C., Reider, G.A., Brabec, T., Corkum, P., Heinzmann, U., Drescher, M., Krausz, F.: Attosecond metrology. Nature 414, 509–513 (2001) https://doi.org/10.1038/35107000 Paul et al. [2001] Paul, P.M., Toma, E.S., Breger, P., Mullot, G., Augé, F., Balcou, P., Muller, H.G., Agostini, P.: Observation of a train of attosecond pulses from high harmonic generation. Science 292(5522), 1689–1692 (2001) https://doi.org/10.1126/science.1059413 Corkum [1993] Corkum, P.B.: Plasma perspective on strong field multiphoton ionization. Phys. Rev. Lett. 71(13), 1994–1997 (1993) https://doi.org/10.1103/PhysRevLett.71.1994 Lewenstein et al. [1994] Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Paul, P.M., Toma, E.S., Breger, P., Mullot, G., Augé, F., Balcou, P., Muller, H.G., Agostini, P.: Observation of a train of attosecond pulses from high harmonic generation. Science 292(5522), 1689–1692 (2001) https://doi.org/10.1126/science.1059413 Corkum [1993] Corkum, P.B.: Plasma perspective on strong field multiphoton ionization. Phys. Rev. Lett. 71(13), 1994–1997 (1993) https://doi.org/10.1103/PhysRevLett.71.1994 Lewenstein et al. [1994] Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Corkum, P.B.: Plasma perspective on strong field multiphoton ionization. Phys. Rev. Lett. 71(13), 1994–1997 (1993) https://doi.org/10.1103/PhysRevLett.71.1994 Lewenstein et al. [1994] Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. 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[2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. 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[2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. 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[2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. 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[2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. 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[2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Goulielmakis, E., Brabec, T.: High harmonic generation in condensed matter. Nature Photonics 16(6), 411–421 (2022) https://doi.org/10.1038/s41566-022-00988-y Hentschel et al. [2001] Hentschel, M., Kienberger, R., Spielmann, C., Reider, G.A., Brabec, T., Corkum, P., Heinzmann, U., Drescher, M., Krausz, F.: Attosecond metrology. Nature 414, 509–513 (2001) https://doi.org/10.1038/35107000 Paul et al. [2001] Paul, P.M., Toma, E.S., Breger, P., Mullot, G., Augé, F., Balcou, P., Muller, H.G., Agostini, P.: Observation of a train of attosecond pulses from high harmonic generation. Science 292(5522), 1689–1692 (2001) https://doi.org/10.1126/science.1059413 Corkum [1993] Corkum, P.B.: Plasma perspective on strong field multiphoton ionization. Phys. Rev. Lett. 71(13), 1994–1997 (1993) https://doi.org/10.1103/PhysRevLett.71.1994 Lewenstein et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Paul, P.M., Toma, E.S., Breger, P., Mullot, G., Augé, F., Balcou, P., Muller, H.G., Agostini, P.: Observation of a train of attosecond pulses from high harmonic generation. Science 292(5522), 1689–1692 (2001) https://doi.org/10.1126/science.1059413 Corkum [1993] Corkum, P.B.: Plasma perspective on strong field multiphoton ionization. Phys. Rev. Lett. 71(13), 1994–1997 (1993) https://doi.org/10.1103/PhysRevLett.71.1994 Lewenstein et al. [1994] Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Corkum, P.B.: Plasma perspective on strong field multiphoton ionization. Phys. Rev. Lett. 71(13), 1994–1997 (1993) https://doi.org/10.1103/PhysRevLett.71.1994 Lewenstein et al. [1994] Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. 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[2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. 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[2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. 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[2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. 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[2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. 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[2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Goulielmakis, E., Brabec, T.: High harmonic generation in condensed matter. Nature Photonics 16(6), 411–421 (2022) https://doi.org/10.1038/s41566-022-00988-y Hentschel et al. [2001] Hentschel, M., Kienberger, R., Spielmann, C., Reider, G.A., Brabec, T., Corkum, P., Heinzmann, U., Drescher, M., Krausz, F.: Attosecond metrology. Nature 414, 509–513 (2001) https://doi.org/10.1038/35107000 Paul et al. [2001] Paul, P.M., Toma, E.S., Breger, P., Mullot, G., Augé, F., Balcou, P., Muller, H.G., Agostini, P.: Observation of a train of attosecond pulses from high harmonic generation. Science 292(5522), 1689–1692 (2001) https://doi.org/10.1126/science.1059413 Corkum [1993] Corkum, P.B.: Plasma perspective on strong field multiphoton ionization. Phys. Rev. Lett. 71(13), 1994–1997 (1993) https://doi.org/10.1103/PhysRevLett.71.1994 Lewenstein et al. 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[2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. 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[2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Hentschel, M., Kienberger, R., Spielmann, C., Reider, G.A., Brabec, T., Corkum, P., Heinzmann, U., Drescher, M., Krausz, F.: Attosecond metrology. Nature 414, 509–513 (2001) https://doi.org/10.1038/35107000 Paul et al. [2001] Paul, P.M., Toma, E.S., Breger, P., Mullot, G., Augé, F., Balcou, P., Muller, H.G., Agostini, P.: Observation of a train of attosecond pulses from high harmonic generation. Science 292(5522), 1689–1692 (2001) https://doi.org/10.1126/science.1059413 Corkum [1993] Corkum, P.B.: Plasma perspective on strong field multiphoton ionization. Phys. Rev. Lett. 71(13), 1994–1997 (1993) https://doi.org/10.1103/PhysRevLett.71.1994 Lewenstein et al. [1994] Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Paul, P.M., Toma, E.S., Breger, P., Mullot, G., Augé, F., Balcou, P., Muller, H.G., Agostini, P.: Observation of a train of attosecond pulses from high harmonic generation. Science 292(5522), 1689–1692 (2001) https://doi.org/10.1126/science.1059413 Corkum [1993] Corkum, P.B.: Plasma perspective on strong field multiphoton ionization. Phys. Rev. Lett. 71(13), 1994–1997 (1993) https://doi.org/10.1103/PhysRevLett.71.1994 Lewenstein et al. [1994] Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Corkum, P.B.: Plasma perspective on strong field multiphoton ionization. Phys. Rev. Lett. 71(13), 1994–1997 (1993) https://doi.org/10.1103/PhysRevLett.71.1994 Lewenstein et al. [1994] Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. 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[2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. 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[2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Corkum, P.B.: Plasma perspective on strong field multiphoton ionization. Phys. Rev. Lett. 71(13), 1994–1997 (1993) https://doi.org/10.1103/PhysRevLett.71.1994 Lewenstein et al. [1994] Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. 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[2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Paul, P.M., Toma, E.S., Breger, P., Mullot, G., Augé, F., Balcou, P., Muller, H.G., Agostini, P.: Observation of a train of attosecond pulses from high harmonic generation. Science 292(5522), 1689–1692 (2001) https://doi.org/10.1126/science.1059413 Corkum [1993] Corkum, P.B.: Plasma perspective on strong field multiphoton ionization. Phys. Rev. Lett. 71(13), 1994–1997 (1993) https://doi.org/10.1103/PhysRevLett.71.1994 Lewenstein et al. [1994] Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Corkum, P.B.: Plasma perspective on strong field multiphoton ionization. Phys. Rev. Lett. 71(13), 1994–1997 (1993) https://doi.org/10.1103/PhysRevLett.71.1994 Lewenstein et al. [1994] Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. 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[2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. 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[2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. 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[2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. 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[2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. 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[2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. 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[2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. 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[2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. 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[2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. 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[2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. 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[2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. 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[2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. 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[2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. 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[2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. 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[2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Balcou, P., Ivanov, M.Y., L’Huillier, A., Corkum, P.B.: Theory of high-harmonic generation by low-frequency laser fields. Phys. Rev. A 49, 2117–2132 (1994) https://doi.org/10.1103/PhysRevA.49.2117 Vampa et al. [2015] Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. 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[2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vampa, G., Hammond, T.J., Thiré, N., Schmidt, B.E., Légaré, F., McDonald, C.R., Brabec, T., Corkum, P.B.: Linking high harmonics from gases and solids. Nature 522, 462–464 (2015) https://doi.org/10.1038/nature14517 Borsch et al. [2023] Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Borsch, M., Meierhofer, M., Huber, R., Kira, M.: Lightwave electronics in condensed matter. Nature Reviews Materials 8(10), 668–687 (2023) https://doi.org/10.1038/s41578-023-00592-8 Luu et al. [2015] Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. 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[2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Luu, T.T., Garg, M., Kruchinin, S.Y., Moulet, A., Hassan, M.T., Goulielmakis, E.: Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521(7553), 498–502 (2015) https://doi.org/10.1038/nature14456 Lakhotia et al. [2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. 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[2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. 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[2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. 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[2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. 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[2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2020] Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lakhotia, H., Kim, H.Y., Zhan, M., Hu, S., Meng, S., Goulielmakis, E.: Laser picoscopy of valence electrons in solids. Nature 583, 55–59 (2020) https://doi.org/10.1038/s41586-020-2429-z Alcalà et al. [2022] Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. 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[2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. 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[2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Alcalà, J., Bhattacharya, U., Biegert, J., Ciappina, M., Elu, U., Graß, T., Grochowski, P.T., Lewenstein, M., Palau, A., Sidiropoulos, T.P.H., Steinle, T., Tyulnev, I.: High-harmonic spectroscopy of quantum phase transitions in a high-tc superconductor. Proceedings of the National Academy of Sciences 119(40), 2207766119 (2022) https://doi.org/10.1073/pnas.2207766119 Uzan-Narovlansky et al. [2024] Uzan-Narovlansky, A.J., Faeyrman, L., Brown, G.G., Shames, S., Narovlansky, V., Xiao, J., Arusi-Parpar, T., Kneller, O., Bruner, B.D., Smirnova, O., Silva, R.E.F., Yan, B., Jiménez-Galán, Ivanov, M., Dudovich, N.: Observation of interband berry phase in laser-driven crystals. Nature 626, 66–71 (2024) https://doi.org/10.1038/s41586-023-06828-5 Gorlach et al. [2020] Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. 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[2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. 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[2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. 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Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Neufeld, O., Rivera, N., Cohen, O., Kaminer, I.: The quantum-optical nature of high harmonic generation. Nature Communications 11(1), 4598 (2020) https://doi.org/10.1038/s41467-020-18218-w Sloan et al. [2023] Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. 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[2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. 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[2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. 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[2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. 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[2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. 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Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Sloan, J., Gorlach, A., Tzur, M.E., Rivera, N., Cohen, O., Kaminer, I., Soljačić, M.: Entangling extreme ultraviolet photons through strong field pair generation (2023). https://doi.org/10.48550/arXiv.2309.16466 Yi et al. [2024] Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. 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[2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Yi, S., Babushkin, I., Smirnova, O., Ivanov, M.: Generation of massively entangled bright states of light during harmonic generation in resonant media (2024). https://doi.org/10.48550/arXiv.2401.02817 Tsatrafyllis et al. [2017] Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. 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[2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. 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[2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. 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[2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. 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[2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. [2019] Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kominis, I.K., Gonoskov, I.A., Tzallas, P.: High-order harmonics measured by the photon statistics of the infrared driving-field exiting the atomic medium. Nature Communications 8(1), 15170 (2017) https://doi.org/10.1038/ncomms15170 Tsatrafyllis et al. 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[2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. 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[2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Tsatrafyllis, N., Kühn, S., Dumergue, M., Foldi, P., Kahaly, S., Cormier, E., Gonoskov, I.A., Kiss, B., Varju, K., Varro, S., Tzallas, P.: Quantum optical signatures in a strong laser pulse after interaction with semiconductors. Phys. Rev. Lett. 122, 193602 (2019) https://doi.org/10.1103/PhysRevLett.122.193602 Lewenstein et al. [2021] Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. 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[2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. 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[2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. 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[2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. 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[2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. 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Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lewenstein, M., Ciappina, M.F., Pisanty, E., Rivera-Dean, J., Stammer, P., Lamprou, T., Tzallas, P.: Generation of optical schrödinger cat states in intense laser–matter interactions. Nature Physics 17(10), 1104–1108 (2021) https://doi.org/10.1038/s41567-021-01317-w Gorlach et al. [2023] Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., Kaminer, I.: High-harmonic generation driven by quantum light. Nature Physics 19(11), 1689–1696 (2023) https://doi.org/10.1038/s41567-023-02127-y Even Tzur et al. [2023] Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. 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[2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., Cohen, O.: Photon-statistics force in ultrafast electron dynamics. Nature Photonics 17(6), 501–509 (2023) https://doi.org/10.1038/s41566-023-01209-w Vahlbruch et al. [2016] Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. 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Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Vahlbruch, H., Mehmet, M., Danzmann, K., Schnabel, R.: Detection of 15 db squeezed states of light and their application for the absolute calibration of photoelectric quantum efficiency. Phys. Rev. Lett. 117, 110801 (2016) https://doi.org/10.1103/PhysRevLett.117.110801 Bruno et al. [2013] Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Bruno, N., Martin, A., Sekatski, P., Sangouard, N., Thew, R.T., Gisin, N.: Displacement of entanglement back and forth between the micro and macro domains. Nature Physics 9(9), 545–548 (2013) https://doi.org/10.1038/nphys2681 Lvovsky et al. [2013] Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Lvovsky, A.I., Ghobadi, R., Chandra, A., Prasad, A.S., Simon, C.: Observation of micro–macro entanglement of light. Nature Physics 9(9), 541–544 (2013) https://doi.org/10.1038/nphys2682 Laghaout et al. [2015] Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Laghaout, A., Neergaard-Nielsen, J.S., Andersen, U.L.: Assessments of macroscopicity for quantum optical states. Optics Communications 337, 96–101 (2015) https://doi.org/10.1016/j.optcom.2014.07.046 . Macroscopic quantumness: theory and applications in optical sciences Spasibko et al. [2017] Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Spasibko, K.Y., Kopylov, D.A., Krutyanskiy, V.L., Murzina, T.V., Leuchs, G., Chekhova, M.V.: Multiphoton effects enhanced due to ultrafast photon-number fluctuations. Phys. Rev. Lett. 119, 223603 (2017) https://doi.org/10.1103/PhysRevLett.119.223603 Manceau et al. [2019] Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Manceau, M., Spasibko, K.Y., Leuchs, G., Filip, R., Chekhova, M.V.: Indefinite-mean pareto photon distribution from amplified quantum noise. Phys. Rev. Lett. 123, 123606 (2019) https://doi.org/10.1103/PhysRevLett.123.123606 Finger et al. [2015] Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. [2012] Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. [2015] Riek, C., Seletskiy, D.V., Moskalenko, A.S., Schmidt, J.F., Krauspe, P., Eckart, S., Eggert, S., Burkard, G., Leitenstorfer, A.: Direct sampling of electric-field vacuum fluctuations. Science 350(6259), 420–423 (2015) https://doi.org/10.1126/science.aac9788 Riek et al. [2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Finger, M.A., Iskhakov, T.S., Joly, N.Y., Chekhova, M.V., Russell, P.S.J.: Raman-free, noble-gas-filled photonic-crystal fiber source for ultrafast, very bright twin-beam squeezed vacuum. Phys. Rev. Lett. 115, 143602 (2015) https://doi.org/10.1103/PhysRevLett.115.143602 Iskhakov et al. 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Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Iskhakov, T.S., Agafonov, I.N., Chekhova, M.V., Leuchs, G.: Polarization-entangled light pulses of 105superscript105{10}^{5}10 start_POSTSUPERSCRIPT 5 end_POSTSUPERSCRIPT photons. Phys. Rev. Lett. 109, 150502 (2012) https://doi.org/10.1103/PhysRevLett.109.150502 Virally et al. [2021] Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. 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[2017] Riek, C., Sulzer, P., Seeger, M., Moskalenko, A.S., Burkard, G., Seletskiy, D.V., Leitenstorfer, A.: Subcycle quantum electrodynamics. Nature 541(7637), 376–379 (2017) https://doi.org/10.1038/nature21024 Kase and Ohi [1974] Kase, S., Ohi, K.: Optical absorption and interband faraday rotation in litao3 and linbo3. Ferroelectrics 8(1), 419–420 (1974) https://doi.org/10.1080/00150197408234114 Pérez et al. [2014] Pérez, A.M., Iskhakov, T.S., Sharapova, P., Lemieux, S., Tikhonova, O.V., Chekhova, M.V., Leuchs, G.: Bright squeezed-vacuum source with 1.1 spatial mode. Opt. Lett. 39(8), 2403–2406 (2014) https://doi.org/10.1364/OL.39.002403 Luu and Wörner [2016] Luu, T.T., Wörner, H.J.: High-order harmonic generation in solids: A unifying approach. Phys. Rev. B 94, 115164 (2016) https://doi.org/10.1103/PhysRevB.94.115164 Shao et al. [2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Virally, S., Cusson, P., Seletskiy, D.V.: Enhanced electro-optic sampling with quantum probes. Phys. Rev. Lett. 127, 270504 (2021) https://doi.org/10.1103/PhysRevLett.127.270504 Iskhakov et al. [2012] Iskhakov, T.S., Pérez, A.M., Spasibko, K.Y., Chekhova, M.V., Leuchs, G.: Superbunched bright squeezed vacuum state. Opt. Lett. 37(11), 1919–1921 (2012) https://doi.org/10.1364/OL.37.001919 Heimerl et al. [2023] Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. 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[2021] Shao, T.-J., Hu, F., Chen, H.-B.: Spontaneous polarization effects on solid high harmonic generation in ferroelectric lithium niobate crystals. J. Phys. B: At. Mol. Opt. Phys. 54(24) (2021) https://doi.org/10.1088/1361-6455/ac43f5 Heimerl, J., Mikhaylov, A., Meier, S., Höllerer, H., Kaminer, I., Chekhova, M., Hommelhoff, P.: Multi-photon electron emission with non-classical light (2023). https://doi.org/10.48550/arXiv.2307.14153 Even Tzur and Cohen [2024] Even Tzur, M., Cohen, O.: Motion of charged particles in bright squeezed vacuum. Light: Science & Applications 13(1), 41 (2024) https://doi.org/10.1038/s41377-024-01381-w Tzur et al. [2023] Tzur, M.E., Birk, M., Gorlach, A., Kaminer, I., Krüger, M., Cohen, O.: Generation of squeezed high-order harmonics (2023). https://doi.org/10.48550/arXiv.2311.11257 Riek et al. 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