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

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.