光纤信道压力对实际量子密钥分发误码率的影响

摘要

An actual peer to peer quantum key distribution experimental system of polarization encoding was built based on BB84 protocol under pressure testing conditions.Fibre channel pressure experiment about quantum key distribution was completed.The theoretical model of quantum bit error rate was established with positive operator valued measurement method.The research results show that under the same pressure,bit error rate increased with the increase of angle,the result was as theoretical arithmetic expected;and at the same angle,the bit error rate showed a gentle shock upward trend with the increase of pressure,and when the pressure exceeded a critical value,the bit error rate increased rapidly,approaching the limit,forcing the quantum key distribution system to reestablish a connection.%基于 BB84协议原理，构建压力环境下偏振编码的点对点实际量子密钥分发系统，进行光纤信道压力作用下的量子密钥分发实验，并采用半正定算子测量方法建立误码率分析模型。实验结果表明：相同作用力下，误码率随作用角度的增加而增大，与仿真结果相同；相同作用角下，误码率随作用力的增加呈平缓的震荡上升趋势，但当作用力超过某一临界值时，误码率会迅速提高，逼近极限值，迫使量子密钥分发系统重新建立连接。