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由于长距离单模光纤传输中存在的双折射效应会引起偏振随机抖动,光纤中利用偏振编码进行量子密钥分发一直难以实现.利用光子计数分析光纤中的偏振变化情况,并通过反馈控制的方式补偿偏振变化,从而实现了基于BB84协议的偏振编码长时间稳定的量子密钥分发实验,传输距离为100km.
Because of the birefringence effect in long-distance single-mode fiber transmission, the random jittering of polarization will occur. It is difficult to realize the quantum key distribution using polarization coding in optical fiber. By using photon counting to analyze the polarization change in optical fiber and feedback control Compensate the polarization change, so as to realize the long time stable quantum key distribution experiment of polarization code based on BB84 protocol, the transmission distance is 100km.