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针对相位编码量子密钥分发(QKD)系统中存在的相位漂移和截获-重发攻击,分析了双马赫-曾德尔干涉仪QKD系统,给出了探测器的输入信号模型,计算了系统量子误码率及窃听信息量,并为提高密钥生成率提供了一种可能的方法。研究表明,相位漂移会使系统误码率增加,稳定性降低;相比理想的截获-重发攻击,窃听信息量有所下降,因此密性放大过程对窃听信息的估计值可以相对减小,最终密钥生成率得以提高。在不考虑传输光纤中的相位相对漂移时,误码率随相位漂移角度呈余弦变化,全部截获-重发攻击时的变化周期是无窃听时的一半,变化频率更加剧烈。55%部分窃听时,若合法通信者选择误码阈值为15%,窃听者可获得25.5%的信息量且不被发现。
Aiming at the phase drift and intercept - reissue attack existing in phase - coded quantum key distribution (QKD) system, the double Mach - Zehnder interferometer QKD system is analyzed. The input signal model of the detector is given and the system quantum error Rate and eavesdropping information, and to improve the key generation rate provides a possible method. The research shows that the phase error can increase the bit error rate and decrease the stability of the system. Compared with the ideal intercept-retransmission attack, the amount of eavesdropping information decreases. Therefore, the estimation of eavesdropping information can be reduced relatively in the process of dense amplification, The final key generation rate is increased. When the relative phase shift in transmission fiber is not considered, the bit error rate changes cosine with the phase shift angle, and all the interception - the cycle of retransmission attack is half of that without tapping, and the frequency of change is more severe. 55% partial eavesdropping, eavesdroppers get 25.5% of the amount of information is not found if the legitimate communicator chooses to 15% error threshold.