Improved statistical fluctuation analysis for two decoy-states phase-matching quantum key distribution  

作　　者：周江平 周媛媛 周学军 暴轩 Jiang-Ping Zhou;Yuan-Yuan Zhou;Xue-Jun Zhou;Xuan Bao(College of Electronic Engineering,Naval University of engineering,Wuhan 430000,China;Unit 92682,Zhanjiang 524000,China)

机构地区：[1]College of Electronic Engineering,Naval University of engineering,Wuhan 430000,China [2]Unit 92682,Zhanjiang 524000,China

出　　处：《Chinese Physics B》2023年第8期188-194,共7页中国物理B（英文版）

摘　　要：Phase-matching quantum key distribution is a promising scheme for remote quantum key distribution,breaking through the traditional linear key-rate bound.In practical applications,finite data size can cause significant system performance to deteriorate when data size is below 1010.In this work,an improved statistical fluctuation analysis method is applied for the first time to two decoy-states phase-matching quantum key distribution,offering a new insight and potential solutions for improving the key generation rate and the maximum transmission distance while maintaining security.Moreover,we also compare the influence of the proposed improved statistical fluctuation analysis method on system performance with those of the Gaussian approximation and Chernoff-Hoeffding boundary methods on system performance.The simulation results show that the proposed scheme significantly improves the key generation rate and maximum transmission distance in comparison with the Chernoff-Hoeffding approach,and approach the results obtained when the Gaussian approximation is employed.At the same time,the proposed scheme retains the same security level as the Chernoff-Hoeffding method,and is even more secure than the Gaussian approximation.

关 键 词：quantum key distribution phase matching protocol statistical fluctuation analysis decoy state 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理]