Effect of weak randomness flaws on security evaluation of practical quantum key distribution with distinguishable decoy states  

作　　者：周雨 李宏伟 周淳 汪洋 陆宜飞 江木生 张晓旭 鲍皖苏 Yu Zhou;Hong-Wei Li;Chun Zhou;Yang Wang;Yi-Fei Lu;Mu-Sheng Jiang;Xiao-Xu Zhang;Wan-Su Bao(Henan Key Laboratory of Quantum Information and Cryptography,SSF IEU,Zhengzhou 450001,China;Synergetic Innovation Centre of Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]Henan Key Laboratory of Quantum Information and Cryptography,SSF IEU,Zhengzhou 450001,China [2]Synergetic Innovation Centre of Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Physics B》2023年第5期254-260,共7页中国物理B（英文版）

基　　金：the National Key Research and Development Program of China(Grant No.2020YFA0309702);NSAF(Grant No.U2130205);the National Natural Science Foundation of China(Grant Nos.62101597,61605248,and 61505261);the China Postdoctoral Science Foundation(Grant No.2021M691536);the Natural Science Foundation of Henan(Grant Nos.202300410534 and 202300410532);the Anhui Initiative in Quantum Information Technologies。

摘　　要：Quantum key distribution provides an unconditional secure key sharing method in theory,but the imperfect factors of practical devices will bring security vulnerabilities.In this paper,we characterize the imperfections of the sender and analyze the possible attack strategies of Eve.Firstly,we present a quantized model for distinguishability of decoy states caused by intensity modulation.Besides,considering that Eve may control the preparation of states through hidden variables,we evaluate the security of preparation in practical quantum key distribution(QKD)scheme based on the weak-randomness model.Finally,we analyze the influence of the distinguishability of decoy state to secure key rate,for Eve may conduct the beam splitting attack and control the channel attenuation of different parts.Through the simulation,it can be seen that the secure key rate is sensitive to the distinguishability of decoy state and weak randomness,especially when Eve can control the channel attenuation.

关 键 词：weak randomness quantum key distribution distinguishable decoy state 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理]