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 9%左右 An all-optical quantum key distribution system prototype was completed at 850 nm.The system uses a single photon as the information carrier and an optical fiber as a quantum channel to establish a shared key between the two parties to complete the distribution of the quantum key, Its security is guaranteed by the basic principle of quantum mechanics - the uncertainty principle and the quantum non-clonability theorem.The information modulation mode adopted is phase modulation, and the communication protocol adopts BB84 protocol.The communication distance is 1.1km, the effective data transfer rate is 3bit s, bit error rate of about 9%