[4] LIU T, ZHU C, SUN C, et al. Performance analysis of free space quantum key distribution with different wavelengths[C]//AOPC 2019: Quantum Information Technology. International Society for Optics and Photonics, 2019: 1133909-1-1133909-6.
[7] FOSSIER S, DIAMANTI E, DEBUISSCHERT T, et al. Improvement of continuous-variable quantum key distribution systems by using optical preamplifiers[J]. Journal of Physics B, 2009, 42(11): 114014-1-114014-11.
[9] CAVES C M. Quantum limits on noise in linear amplifiers[J]. Physical Review D, 1982, 26(8): 1817-1839.
[10] OU Z Y, PEREIRA S F, KIMBLE H J. Quantum noise reduction in optical amplification[J]. Physical Review Letters, 1993, 70(21): 3239-3242.
[11] ZHANG H, FANG J, HE G. Improving the performance of the four-state continuous-variable quantum key distribution by using optical amplifiers[J]. Physical Review A, 2012, 86(2): 022338-1-022338-7.
[12] SHENTU G L, XIA X X, SUN Q C, et al. Upconversion detection near 2 μm at the single photon level[J]. Optics Letters, 2013, 38(23): 4985-4987.
