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.
作者
刘涛
赵硕
Ivan B.Djordjevic
刘舒宇
王思佳
吴彤
李斌
王平平
张荣香
Tao Liu;Shuo Zhao;Ivan B.Djordjevic;Shuyu Liu;Sijia Wang;Tong Wu;Bin Li;Pingping Wang;Rongxiang Zhang(Department of Electronic and Communication Engineering,North China Electric Power University,Baoding 071003,China;Hebei Key Laboratory of Power Internet of Things Technology,North China Electric Power University,Baoding 071003,China;Baoding Key Laboratory of Optical Fiber Sensing and Optical Communication Technology,North China Electric Power University,Baoding 071003,China;Department of Electrical and Computer Engineering,University of Arizona,1230 E Speedway Blvd,Tucson,Arizona 85721,USA;College of Physics Science and Technology,Hebei University,Baoding 071002,China)
基金
Project supported by the National Natural Science Foundation of China(Grant No.62071180)
Fundamental Research Funds for the Central Universities,China(Grant No.2020MS099)。