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在相位编码量子密钥分发系统中,单光子干涉可视度决定了系统的成码率。本文提出一种优化单光子干涉可视度的方法,即利用遗传算法和四通道偏振控制器实时补偿单光子偏振漂移,同时利用时分复用参考光连续无复位地补偿单光子相位漂移,最终在25km光纤中实时优化的单光子干涉可视度达到98.6%,相位编码量子密钥分发系统成码率为2.2kbit/s。
In the phase-encoding quantum key distribution system, the one-photon interference visibility determines the system’s code rate. In this paper, a method to optimize the visibility of single photon interference is proposed, which uses the genetic algorithm and the four-channel polarization controller to compensate one-photon polarization drift in real time, and compensates the one-photon phase shift continuously without reset using time- The real-time optimized one-photon interference visibility in 25km fiber reaches 98.6%, and the phase-encoding quantum key distribution system has a code rate of 2.2kbit / s.