双向隐形传态方案及安全性分析  

Scheme of Two-way Quantum Teleportation and Security

作　　者：杨幼凤[1,2] 叶志清[1,2] 

机构地区：[1]江西师范大学物理与通信电子学院 [2]江西省光电子与通信重点实验室,南昌330022

出　　处：《光子学报》2013年第5期619-622,共4页Acta Photonica Sinica

基　　金：国家自然科学基金(No.60967002);江西省自然科学基金(No.20114BAB02003);江西省教育厅科技项目(No.GJJ10401)资助

摘　　要：提出了一种用Bell纠缠态作为量子信道,实现双向隐形传态的方案.通信双方Alice、Bob事先共享二对Bell纠缠态,通信开始后,Alice、Bob分别对自己拥有的部分粒子作Bell基联合测量,并将测量结果通过经典信道告诉对方.Alice、Bob根据对方提供的测量结果,做相应的幺正变换,即在己方的粒子上,再现对方要传的量子态信息,从而实现双向传态的目的.为了提高量子双向隐形传态的安全性,加入第三方控制,分析表明,通过增加控制方的粒子数可以增加系统的安全性,但增加到一定数量后,将无助于量子信道安全性的提高.A scheme of two-way teleportation is proposed,with Bell entangled state as Quantum Channel(QC).Firstly,two sides of communication(Alice and Bob),share two EPR entangled states.After communication,Alice and Bob perform Bell-state joint measurements to their own qubits respectively,and announce the measured results via Classical Channel(CC).Then according to the measured results,Alice and Bob make relevant unitary transformations,namely,its own party can reproduce the opposite quantum state information,and thus the two-way teleportation is realized.In order to enhance the security of two-way teleportation,and the analysis result indicates that the system′s security will strengthen with the increase of the control particles,but the security will not strengthen when the control particles increase to a certain number.

关 键 词：量子信息 隐形传态 双向通信 安全性 

分 类 号：TN918[电子电信—通信与信息系统]