Junction-free microwave two-mode radiation from a kinetic inductance nanowire
Abstract: Parametric down-conversion is a widely exploited technique in optics to produce entangled states of photons for quantum information processing and quantum sensing. In the microwave domain, devices based on Josephson junctions, such as Josephson parametric amplifiers (JPAs) and voltage-biased Josephson junctions, have been successfully utilized to generate such states. However, their high susceptibility to magnetic fields has posed challenges in many applications. Here we demonstrate the generation of two-mode squeezed states via four-wave-mixing in a superconducting nanowire resonator patterned from NbN. The NbN nanowire exhibits a strong Kerr nonlinearity, resulting in the emission of a signal-idler pair with a cross-correlation of $g{(2)}(0) = 11.9$. Owing to the magnetic resilience and high critical temperature ($T_c$) of NbN, our microwave parametric sources based on kinetic inductance promise an expanded range of potential applications.
- G. Milburn and S. L. Braunstein, Quantum teleportation with squeezed vacuum states, Physical Review A 60, 937 (1999).
- Q. Zhuang, Z. Zhang, and J. H. Shapiro, Distributed quantum sensing using continuous-variable multipartite entanglement, Physical Review A 97, 032329 (2018).
- S. Lloyd and S. L. Braunstein, Quantum computation over continuous variables, Physical Review Letters 82, 1784 (1999).
- H. J. Kimble, The quantum internet, Nature 453, 1023 (2008).
- C. Simon, Towards a global quantum network, Nature Photonics 11, 678 (2017).
- S. Wehner, D. Elkouss, and R. Hanson, Quantum internet: A vision for the road ahead, Science 362, eaam9288 (2018).
- M. Khalifa and J. Salfi, Nonlinearity and parametric amplification of superconducting nanowire resonators in magnetic field, Physical Review Applied 19, 034024 (2023).
- A. I. Lvovsky, Squeezed light, Photonics: Scientific Foundations, Technology and Applications 1, 121 (2015).
- A. Grimm, Josephson photonics: Statistics of photons emitted by inelastic Cooper pair tunneling, Ph.D. thesis, Grenoble University (2015).
- R. G. Lyons, Understanding digital signal processing, 3/E (Pearson Education India, 1997).
- W. Kester, Taking the mystery out of the infamous formula,” snr= 6.02 n+ 1.76 db,” and why you should care, Analog Devices Tutorial, MT-001 Rev. A 10 (2009).
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