基于微弱相干脉冲稳定差分相位量子密钥分发  

Stable differential-phase-shift quantum key distribution based on weak coherent pulses

作　　者：赵峰[1] 路轶群[1] 王发强[1] 陈霞[1] 李明明[1] 郭邦红[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

出　　处：《物理学报》2007年第4期2175-2179,共5页Acta Physica Sinica

基　　金：国家重点基础研究发展规划(批准号:2001039302)资助的课题~~

摘　　要：基于差分相位量子密钥分发协议,对微弱相干光脉冲相位差进行编码,在接收端采用Faraday-Michelson系统进行解码.这种量子密钥分发系统具有密钥生成效率高、接收端干涉稳定性好、极限传输距离长等优点,同时还具有光路结构简单、易于在现有的技术条件下实现等特点,特别适用于远程光纤量子密钥分发.在实验系统中利用嵌入式微处理系统来控制量子密钥分发过程,进行了76km的稳定光纤量子密钥分发实验,其原始密钥的误码率为5.3%.Differential phase shift quantum key distribution（DPSQKD） experiment based on weak coherent pulses have been performed in the laboratory. We encoded the bit information between the consecutive pulses. The bit information was decoded at Bob＇ s side by Michelson-Faraday interferometer and single photon detector. This kind of quantum key distribution system can provide stable key distribution process, high efficiency of key creation, and high security key. So it is easily implemented in optical fibers using readily available optical telecommunication tools. We experimented DPSQKD over 76 km on fiber, the error rate of the sifted key is 5.3%. The quantum key distribution process is controlled by micro-computer based on ARM （advanced RISC （reduced instruction set computing） machines） processor.

关 键 词：差分相位 量子密钥分发 安全性 稳定性 

分 类 号：O413[理学—理论物理]