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基于连续变量GHZ态的纠缠特性,提出一种三方量子确定性密钥分配协议,其中密钥由GHZ态的振幅产生,而相位可以用来验证信道的安全性.现有的量子确定性密钥分配协议一次只能向一个接收方传送密钥,现实生活中经常要向多个接收方发送确定性密钥.信息论分析结果表明,当信道传输效率大于0.5时,该协议可以同时向两个接收方安全传送确定性密钥,制备多重纠缠态后,该协议还能够扩展成多方量子确定性密钥分配协议,这极大提高了密钥的整体传送效率,而且连续变量量子GHZ态信道容量较高,因此该协议具有重要的现实意义.
Based on the entanglement property of continuous variable GHZ states, a three-party quantum key distribution protocol is proposed, in which the key is generated by the amplitude of the GHZ state and the phase can be used to verify the channel security. The existing quantum deterministic key The distribution protocol can only transmit the key to one receiver at a time, and in real life, the deterministic key is often sent to multiple receivers. The analysis of information theory shows that when the channel transmission efficiency is greater than 0.5, the protocol can send the key to both receivers After the secure transfer of the deterministic key, the protocol can be extended to a multiparty quantum deterministic key distribution protocol, which greatly improves the overall transfer efficiency of the key, and the capacity of continuous variable quantum GHZ state channel Therefore, the agreement has important practical significance.