中国物理B ›› 2022, Vol. 31 ›› Issue (11): 110303-110303.doi: 10.1088/1674-1056/ac6b1f
Tao Liu(刘涛)1,2,3,†, Shuo Zhao(赵硕)1, Ivan B. Djordjevic4, Shuyu Liu(刘舒宇)1, Sijia Wang(王思佳)1, Tong Wu(吴彤)1, Bin Li(李斌)1, Pingping Wang(王平平)1, and Rongxiang Zhang(张荣香)5
Tao Liu(刘涛)1,2,3,†, Shuo Zhao(赵硕)1, Ivan B. Djordjevic4, Shuyu Liu(刘舒宇)1, Sijia Wang(王思佳)1, Tong Wu(吴彤)1, Bin Li(李斌)1, Pingping Wang(王平平)1, and Rongxiang Zhang(张荣香)5
摘要: Atmospheric effects have significant influence on the performance of a free-space optical continuous variable quantum key distribution (CVQKD) system. In this paper, we investigate how the transmittance, excess noise and interruption probability caused by atmospheric effects affect the secret-key rate (SKR) of the CVQKD. Three signal wavelengths, two weather conditions, two detection schemes, and two types of attacks are considered in our investigation. An expression aims at calculating the interruption probability is proposed based on the Kolmogorov spectrum model. The results show that a signal using long working wavelength can propagate much further than that of using short wavelength. Moreover, as the wavelength increases, the influence of interruption probability on the SKR becomes more significant, especially within a certain transmission distance. Therefore, interruption probability must be considered for CVQKD by using long-signal wavelengths. Furthermore, different detection schemes used by the receiver will result in different transmission distances when subjected to individual attacks and collective attacks, respectively.
中图分类号: (Quantum communication)