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环境变化引起的相位漂移是双Mach-Zehnder量子密钥分配系统中误码和不稳定性的主要来源.相位漂移由高频振动和低频振动两部分组成,大部分这类振动的影响采用隔振措施(如用泡沫、橡皮包垫隔音)可以消除,而周期为3±0.32min的低频振动依然存在.报道了对这种低频固有振动引起的相移进行实时跟踪和补偿的方法.实验表明,采用这种方法实验室内实现75km量子密钥分配和量子保密通信,在24h内能长期稳定运行,误码率低于6%.
The phase shift caused by environmental change is the main source of error and instability in the dual Mach-Zehnder quantum key distribution system.Phase drift consists of high-frequency vibration and low-frequency vibration. Most of the vibration of this kind adopts vibration isolation (Such as foam, rubber pad noise) can be eliminated, and the low-frequency vibration with period of 3 ± 0.32min still exists.This paper reports the method of real-time tracking and compensating the phase shift caused by low frequency natural vibration.Experiments show that, In this method, 75km quantum key distribution and quantum secure communication can be achieved in the laboratory, which can be long-term and stable operation within 24h with a bit error rate of less than 6%.