一种高效量子密钥分发系统主动相位补偿方法  

An effective active phase compensation method for quantum key distribution system

作　　者：王金东[1] 秦晓娟[2] 魏正军[1] 刘小宝[1] 廖常俊[1] 刘颂豪[1] 

机构地区：[1]华南师范大学信息光电子科技学院光子信息技术广东省高校重点实验室,广州510006 [2]广东广播电视大学工程技术系,广州510091

出　　处：《物理学报》2010年第1期281-286,共6页Acta Physica Sinica

基　　金：广州市科技支撑计划(批准号:2008Z1-D501);广东省工业攻关项目(批准号:2007B010400009)资助的课题~~

摘　　要：针对相位编码量子密钥分发系统相位漂移的实际问题,详细分析了目前解决相位漂移的主要方案,提出了一种"五点法"快速相位漂移参数的扫描方法.该方法只需对五个相位点进行单光子水平的相位扫描,即可得出满足精度要求的相位漂移参数.通过将该方法和其他两种主要相位补偿方法的对比分析,表明该方法可以在更短的扫描时间内有效得到量子密钥分发的相位漂移参数并对相位漂移进行实时补偿.该方法适用于目前常用的相位编码系统,为量子密码系统提供了一种有实际应用价值的主动相位补偿方案.Quantum key distribution （QKD） system must be robust enough in practical communication. The system performance is notably affected by phase drift. For the fiber-based phase-encoded quantum key distribution system, the Faraday-Michelson QKD scheme can auto-compensate the birefringence of fiber, but phase drift caused by environment variations is still a serious problem in practical operation. In this paper, the major schemes to compensate for the phase drift are analyzed in detail and an ＂five-phase＇effective active phase compensation method is proposed. The comparison with other two major active phase compensation schemes also given. The result shows that this method uses less time to acquire the parameter of phase drift with the same precision and it can be used in phase-encoded QKD systems without introducing additional devices.

关 键 词：量子保密通信 相位编码 相位漂移 主动相位补偿 

分 类 号：O431.2[机械工程—光学工程]