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提出一种自动补偿高效实用的改进型差分相位编码量子密钥分发方案.在Alice端采用偏振型强度调制器对连续激光进行调制,产生任意个相干脉冲进行差分相位调制编码;在Bob端采用双FM干涉仪代替传统的M-Z干涉仪,自动补偿了环境引起的偏振抖动,提高了系统的干涉稳定度.简化了系统的结构,提高了密钥生成效率,增强了系统的安全性.在实验上实现了稳定的80km量子密钥分配,误码率<4%.
An efficient and efficient scheme of automatic differential compensation for differential phase encoding quantum key distribution is proposed.A variation type phase modulator is used to modulate the continuous laser at the Alice end and generates arbitrary phase difference pulses for differential phase modulation encoding. FM interferometer instead of the traditional MZ interferometer, which automatically compensates for the environment-induced polarization jitter and improve the stability of the system interference. Simplifies the system structure and improve the key generation efficiency and enhance the security of the system. Achieve a stable 80km quantum key distribution, error rate <4%.