Passive decoy-state quantum key distribution for the weak coherent photon source with finite-length key  

作　　者：李源 鲍皖苏 李宏伟 周淳 汪洋 

机构地区：[1]Zhengzhou Information Science and Technology Institute,Zhengzhou 450004,China [2]Synergetic Innovation Center of Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Physics B》2016年第1期452-459,共8页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.11304397)

摘　　要：Passive decoy-state quantum key distribution systems, proven to be more desirable than active ones in some scenarios, also have the problem of device imperfections like finite-length keys. In this paper, based on the WCP source which can be used for the passive decoy-state method, we obtain the expressions of single-photon error rates, single-photon counts, and phase error rates. According to the information of smooth min-entropy, we calculate the key generation rate under the condition of finite-length key. Key generation rates with different numbers of pulses are compared by numerical simulations. From the results, it can be seen that the passive decoy-state method can have good results if the total number of pulses reaches 1010. We also simulate the passive decoy-state method with different probabilities of choosing a pulse for parameter estimation when the number of pulses is fixed.Passive decoy-state quantum key distribution systems, proven to be more desirable than active ones in some scenarios, also have the problem of device imperfections like finite-length keys. In this paper, based on the WCP source which can be used for the passive decoy-state method, we obtain the expressions of single-photon error rates, single-photon counts, and phase error rates. According to the information of smooth min-entropy, we calculate the key generation rate under the condition of finite-length key. Key generation rates with different numbers of pulses are compared by numerical simulations. From the results, it can be seen that the passive decoy-state method can have good results if the total number of pulses reaches 1010. We also simulate the passive decoy-state method with different probabilities of choosing a pulse for parameter estimation when the number of pulses is fixed.

关 键 词：quantum key distribution passive decoy-state finite-length key weak coherent pulses 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理]