CVQKD中块平均参考相位估计算法的性能优化  

Performance optimization of the block-averaging reference phase estimating algorithm in CVQKD

作　　者：黄彪 韩贺松 黄永梅[1,3,5] 彭真明 HUANG Biao;HAN Hesong;HUANG Yongmei;PENG Zhenming(Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,China;University of Electronic Science and Technologyof China,Chengdu 610054,China;University of Chinese Academy of Sciences,Beijing 100049,China;Southwest Communication Institute,Chengdu 610041,China;Key Laboratory of Optical Engineering,Chinese Academy of Sciences,Chengdu 610209,China)

机构地区：[1]中国科学院光电技术研究所,成都610209 [2]电子科技大学,成都610054 [3]中国科学院大学,北京100049 [4]西南通信研究所,成都610041 [5]中国科学院光束控制重点实验室,成都610209

出　　处：《光通信技术》2021年第6期18-21,共4页Optical Communication Technology

基　　金：国家自然科学基金(U1738204、61775030、61571096)资助;中国科学院光束控制重点实验室基金(2017LBC003)资助。

摘　　要：块平均参考相位估计算法能够有效降低连续变量量子密钥分发的相位补偿噪声方差。为了使块平均参考相位估计算法的性能达到最优,根据相位漂移变化的数学模型,从理论上分析了该算法的均方误差特性,并得到最优的块长度取值。仿真结果表明:最优相位估计可使系统的相位补偿噪声方差降低72%,从而最大化提升安全密钥的成码距离。The block-averaging reference phase estimating algorithm is able to reduce the variance of phase compensation noise effectively in the continuous-variable quantum key distribution.In order to optimize the performance of the block-averaging reference phase estimating algorithm,according to the mathematical model of phase drift variation,the mean square error characteristics of the algorithm are analyzed theoretically,and the optimal block length is obtained.Simulation results show that the variance of phase compensation noise can be reduced by 72%under the optimal phase estimation,so that the distance for generating secure key can be improved most significantly.

关 键 词：量子密钥分发 连续变量 参考脉冲 相位估计 相位补偿 

分 类 号：TN256[电子电信—物理电子学]