用于BB84相位编码量子密钥分发系统的不间断式主动相位补偿方案

方俊彬; 魏正军; 王金东; 廖常俊; 刘颂豪

doi:doi:10.3788/hplpb20112308.2215

强激光与粒子束, 2011, 23 (8): 2215, 网络出版: 2011-09-20

用于BB84相位编码量子密钥分发系统的不间断式主动相位补偿方案

Uninterrupted active phase compensation scheme for BB84 phase encoding quantum key distribution system

论文大纲

方俊彬 ^*魏正军王金东廖常俊刘颂豪

作者单位

华南师范大学信息光电子科技学院，光子信息技术广东普通高校重点实验室，广州 510006

量子密钥分发主动相位补偿不匹配基不间断式 quantum key distribution active phase compensation incompatible basis uninterrupted scheme

摘要

提出一种新的不间断的主动相位补偿方案，在进行量子密钥分发的同时统计不匹配基量子比特在干涉仪不同输出端口上的随机计数分布，给出了由不匹配基量子比特统计数值计算相位漂移参数的计算公式,并由统计数值计算得到相位漂移参数。结果表明：该方案允许系统并行处理量子密钥分发与相位补偿，也充分利用了在原BB84协议中会被丢弃的不匹配基量子比特信息。

Abstract

BB84 phase encoding quantum key distribution systems can distribute shared secret keys between remote communication parties via optic fiber channel with provable security. However, performance of these systems usually suffers from the phase shift in realistic running environment. The existing active phase compensation schemes for these systems have to break the key distribution process to measure phase drift parameters, leading to decrease the final key generation rate of system. A new uninterrupted scheme is proposed to address this problem. The proposed scheme allows the system to run phase compensation process and key distribution process simultaneously by collecting and analyzing the quantum bits with incompatible basis during the quantum key distribution process, which is supposed to be discarded in the classical BB84 quantum key distribution protocol. The bit value carried by the quantum bits with incompatible basis is used in the proposed scheme to calculate the phase shift parameters with the statistic of the random distribution of these bits on the different port of the interferometer.

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方俊彬, 魏正军, 王金东, 廖常俊, 刘颂豪. 用于BB84相位编码量子密钥分发系统的不间断式主动相位补偿方案[J]. 强激光与粒子束, 2011, 23(8): 2215. Fang Junbin, Wei Zhengjun, Wang Jindong, Liao Changjun, Liu Songhao. Uninterrupted active phase compensation scheme for BB84 phase encoding quantum key distribution system[J]. High Power Laser and Particle Beams, 2011, 23(8): 2215.

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