850nm光纤中1.1km量子密钥分发实验

QUANTUM KEY DISTRIBUTION OVER 1.1km IN AN 850nm EXPERIMENTAL ALL-FIBER SYSTEM 

在 8 5 0nm波长完成了一个全光纤量子密钥分发系统原型 .该系统以单光子为信息载体 ,以光纤为量子信道 ,在通信双方建立起共享的密钥 ,从而完成量子密钥的分发 ,其安全性由量子力学基本原理———不确定性原理和量子不可克隆定理所保证 .所采取的信息调制方式为相位调制 ,通信协议采取BB84协议 .通信距离为 1.1km ,有效数据传送速率为 3bit s,误码率为

A 1.1km long all\|fiber quantum key distribution experimental setup has been realized for the first time at 850nm. The system employs the BB84 protocol to establish a secret key between two parties, the security of which is guaranteed by Heisenberg's uncertainty relationship and the quantum noncloning principle. Phase modulated single photons are used to carry the key. The effective transmission rate is 3 bit/s, with a bit error rate of 9%.