基于双偏振分束器的量子密钥分发系统  

A quantum key distribution system based on two polarization beam splitters

作　　者：马海强[1] 李亚玲[1] 赵环[1] 吴令安[1] 

机构地区：[1]中国科学院物理研究所光物理开放实验室,北京100080

出　　处：《物理学报》2005年第11期5014-5017,共4页Acta Physica Sinica

基　　金：国家重点基础研究发展规划(批准号:2001CB309301);中国科学院创新基金(批准号:1731230300009)资助的课题.~~

摘　　要：提出了利用两个偏振分束器的量子密钥分发系统,有效地解决了相位调制器的偏振依赖性问题.以1310nm波长在通信距离为25km的光纤中实现了高密钥生成率,干涉对比度99.4%.有效密钥生成率大于0.6kbit/s,误码率0.5%.We present a quantum key distribution system based on two polarization beam splitters, by means of which the phase modulator＇s polarization dependence is cancelled out. A high key generation rate has been obtained for the first time at 1310nm transmitted over a 25 km long fiber, with a fringe visibility of 99.4%. A sifted key rate of about 0.6 kbits/s and quantum bit error rate of about 0.5% are obtained.

关 键 词：量子密钥分发 偏振分束器 单光子干涉 偏振分束器 量子密钥 分发系统 相位调制器 通信距离 生成率 依赖性 对比度 误码率 

分 类 号：TN918.1[电子电信—通信与信息系统]