论文部分内容阅读
在量子密钥分发系统中,由于长距离光纤信道传输引入的偏振漂移将导致密钥分发效率下降。给出了一种基于遗传算法结合数控偏振控制器实现在单光子量级下对单光子偏振的优化控制与长时间锁定的方法。在25 km单模光纤传输每脉冲平均光子数小于0.1的单光子相位编码量子密钥分发系统中,将信号光偏振优化到最佳值,并实现了系统长期稳定运行,密钥分发成码率高于1.5 kb/s。
In quantum key distribution systems, the polarization drift introduced due to long-distance fiber channel transmission will result in a decrease in key distribution efficiency. A method of single-photon polarization control and long time locking at single photon order based on genetic algorithm and numerical control polarization controller is presented. The single-photon phase-encoding quantum key distribution system that transmits average photons per pulse in 25 km single-mode optical fiber with an average number of photons per pulse is optimized to optimize the polarization of the signal light and achieve long-term stable operation of the system. The key distribution to the code rate Above 1.5 kb / s.