免相位后选择双场量子密钥分发协议光源错误分析  

Analysis of light source errors of no⁃phase⁃postselection twin⁃field type quantum key distribution protocal

作　　者：陆文皓 吴梓涵 马均瑶 余杨 赵生妹[1] LU Wenhao;WU Zihan;MA Junyao;YU Yang;ZHAO Shengmei(School of Communications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《量子电子学报》2024年第6期891-900,共10页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金(62375140,61871234)。

摘　　要：免相位后选择双场量子密钥分发(NPP TF-QKD)协议是双场量子密钥分发(TF-QKD)协议的变种,它继承了TF-QKD在无寄存器情形下超越点到点传输距离极限的优势,同时还简化了协议中安全性的证明,已被实验证实具有较强的实用可行性。然而,该协议中假设光源是精准可控的,但是由于设备的缺陷、环境中存在噪声等原因,这种假设在实际应用中是不成立的。本文在信道非对称的基础上分析了光源强度波动引起的光源错误对NPP TFQKD协议性能的影响,仿真结果显示,光源错误会使协议的安全密钥率降低,并使传输距离缩短。No-phase-postselection twin-field quantum key distribution(NPP TF-QKD)protocal is a variant of twin-field quantum key distribution(TF-QKD)protocal.It not only inherits TF-QKD's advantage of overcoming the constraint of a point-to-point QKD link,but also simplifies its security proof.Its practical feasibility has been demonstrated in experiments.However,it has been assumed that the protocol's light source is precisely controllable,but that is unavailable in practical applications due to the drawbacks of practical devices and environmental noises.In this paper,the influence of the light source intensity fluctuation,an example of light source errors,on NPP TF-QKD protocol's performance is discussed both for the symmetrical and asymmetrical channels.The simulation results show that light source errors can decrease the protocol's secure key rate and shorten the transmission distance of NPP TF-QKD protocal.

关 键 词：量子光学 量子密钥分发 光源错误 光源强度波动 光子数分布 

分 类 号：O431.2[机械工程—光学工程]