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基于真空光速c是极限信号速度这一基本假设 ,提出了复合量子密钥分发 (QKD)系统和双速协议 ,并证明双速协议的安全性与原BB84协议的安全性相同 .结果表明 ,双速协议在将量子密钥生成效率从 5 0 %提高到 1 0 0 %的同时 ,还降低了窃听者Eve可能得到的信息量 .双速协议由于打破了公开讨论之前Bob和Eve的对等地位 ,使QKD在概念上有了明显的改进 ,使协议基的选择空间有了本质性的扩充 .具体给出了三个双速协议的实例 ,并详细分析了它们在截取 重发攻击下的安全性
Based on the basic assumption that vacuum speed of light c is the limit signal speed, a hybrid quantum key distribution (QKD) system and two-speed protocol are proposed and the security of the two-speed protocol is proved to be the same as that of the original BB84 protocol. Speed protocol reduces the amount of information eavesdropper Eve may receive while increasing the quantum key generation efficiency from 50% to 100% .Because the two-speed protocol breaks the parity of Bob and Eve before the open discussion , So that the concept of QKD has been significantly improved to make the choice of protocol base has been an essential expansion of the specific examples given two two-speed protocol and a detailed analysis of their security under interception retransmission attacks Sex