基于量子信道加密原理,结合Ping-Pong协议控制模式和信息模式的概念,提出了一个量子安全直接通信协议.在此协议中,发送者和接收者用n对Bell态作为量子信道,发送者用controlled-Not操作将单粒子纠缠入量子信道,接收者用controlled-Not操作将单粒子与量子信道解纠缠.通信双方依次执行控制模式和信息模式,控制模式检测窃听,信息模式发送秘密信息.控制模式和信息模式均不会对已建立的量子信道造成破坏,因此建立量子信道的过程仅需执行一次,此后通信双方可以反复进行控制模式和信息模式,从而不断进行窃听检测和秘密信息传输.
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