基于GHZ态的三方量子确定性密钥分配协议  

Tripartite quantum deterministic key distribution based on GHZ states

作　　者：周南润[1] 宋汉冲[1] 龚黎华[1] 刘晔[1] 

机构地区：[1]南昌大学电子信息工程系,南昌330031

出　　处：《物理学报》2012年第21期225-231,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11174118);江西省自然科学基金(批准号:20122BAB201031);江西省教育厅科技项目(批准号:GJJ11339;GJJ12137);江西省青年科学家(井冈之星)培养对象计划项目(批准号:20122BCB23002)资助的课题~~

摘　　要：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.By exploiting the entanglement properties of continuous variable quantum GHZ state, we propose a tripartite quantum deterministic key distribution, in which the key is generated from its amplitude and the phase can be used to test and verify the channel security. The existing quantum deterministic key distribution can only hand over deterministic key to one receiver in one communication. However, we always have to transmit deterministic key to more than one receiver in real life. The analysis results of information theory show that when the channel transmission efficiency is greater than 0.5, the proposed protocol can securely hand over the pre-deterministic key to two receivers simultaneously, and it can also be extended to multiparty quantum deterministic key distribution when preparing multiple entangled state, this will greatly improve the overall efficiency of the key transmission, furthermore, the continuous variable quantum GHZ state could have a higher channel capacity, so the protocol has the important practical significance.

关 键 词：连续变量GHZ态 量子确定性密钥分配 密钥管理 量子通信 

分 类 号：TN918[电子电信—通信与信息系统] O413[电子电信—信息与通信工程]