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文中给出了B92协议的最佳窃听方案,得出了该窃听方式下的最佳窃听角度;以马尔柯夫串联信道模型计算了Alice和Eve之间及Alice和Bob之间的平均信息量;讨论了平均互信息、误码率及保密信息与窃听比例、量子态特征量之间的关系。为合法通信者选择合适的量子态特征量以及对窃听者进行检测提供了理论依据和标准。
The best eavesdropping scheme of B92 protocol is given in this paper, and the best eavesdropping angle is obtained under the eavesdropping mode. The average amount of information between Alice and Eve and between Alice and Bob is calculated by Markov series channel model. We discuss the relationship between average mutual information, bit error rate, confidential information, eavesdropping ratio and quantum state features. It provides the theoretical basis and standards for the legitimate correspondents to choose the appropriate quantum state feature quantity and detect the eavesdropper.