Site-selective preparation and multi-state readout of molecules in optical tweezers (2401.13659v1)
Abstract: Polar molecules are a quantum resource with rich internal structure that can be coherently controlled. The structure, however, also makes the state preparation and measurement (SPAM) of molecules challenging. We advance the SPAM of individual molecules assembled from constituent atoms trapped in optical tweezer arrays. Sites without NaCs molecules are eliminated using high-fidelity Cs atom detection, increasing the peak molecule filling fraction of the array threefold. We site-selectively initialize the array in a rotational qubit subspace that is insensitive to differential AC Stark shifts from the optical tweezer. Lastly, we detect multiple rotational states per experimental cycle by imaging atoms after sequential state-selective dissociations. These demonstrations extend the SPAM capabilities of molecules for quantum information, simulation, and metrology.
- C. M. Holland, Y. Lu, and L. W. Cheuk, On-demand entanglement of molecules in a reconfigurable optical tweezer array, Science 382, 1143 (2023).
- K.-K. Ni, T. Rosenband, and D. D. Grimes, Dipolar exchange quantum logic gate with polar molecules, Chem. Sci. 9, 6830 (2018).
- P. J. Low, B. White, and C. Senko, Control and readout of a 13-level trapped ion qudit (2023), arXiv:2306.03340 [quant-ph] .
- M. R. Tarbutt, Laser cooling of molecules, Contemp. Phys. 59, 356 (2018).
- E. S. Shuman, J. F. Barry, and D. DeMille, Laser cooling of a diatomic molecule, Nature 467, 820 (2010).
- T. Kohler, K. Goral, and P. S. Julienne, Production of cold molecules via magnetically tunable Feshbach resonances, Rev. Mod. Phys. 78, 1311 (2006).
- J. W. Park, S. A. Will, and M. W. Zwierlein, Ultracold dipolar gas of fermionic Na4023KsuperscriptsuperscriptNa4023K{}^{23}\mathrm{Na}^{40}\mathrm{K}start_FLOATSUPERSCRIPT 23 end_FLOATSUPERSCRIPT roman_Na start_POSTSUPERSCRIPT 40 end_POSTSUPERSCRIPT roman_K molecules in their absolute ground state, Phys. Rev. Lett. 114, 205302 (2015).
- W. C. Campbell and E. R. Hudson, Dipole-phonon quantum logic with trapped polar molecular ions, Phys. Rev. Lett. 125, 120501 (2020).
- C. Zhang and M. Tarbutt, Quantum computation in a hybrid array of molecules and rydberg atoms, PRX Quantum 3, 030340 (2022).
- M. N. H. Chow, B. J. Little, and Y.-Y. Jau, High-fidelity low-loss state detection of alkali-metal atoms in optical tweezer traps, Phys. Rev. A 108, 032407 (2023).
- K.-K. Ni, Fully controlled individual diatomic polar molecules for quantum science, in Bulletin of the American Physical Society, Vol. 67(7) (American Physical Society, Orlando, Florida, 2022).
- S. S. Ivanov and N. V. Vitanov, Composite two-qubit gates, Phys. Rev. A , 8 (2015).
- T. Fleig and D. DeMille, Theoretical aspects of radium-containing molecules amenable to assembly from laser-cooled atoms for new physics searches, New Journal of Physics 23, 113039 (2021).
- D. Rutley, et. al. (2024).
- F. L. Kien, P. Schneeweiss, and A. Rauschenbeutel, Dynamical polarizability of atoms in arbitrary light fields: general theory and application to cesium, The European Physical Journal D 67, 92 (2013), 1211.2673 .