未知二粒子纠缠态的辅助克隆  

Assited cloning of an unknown two-particle entangled state

作　　者：侯奎[1] 史守华[1] 

机构地区：[1]安徽大学物理与材料科学学院,安徽合肥230039

出　　处：《安徽大学学报（自然科学版）》2009年第1期57-61,共5页Journal of Anhui University(Natural Science Edition)

基　　金：教育部博士点专项基金资助项目(20060357003)

摘　　要：提出一个以三粒子GHZ态为量子信道的未知二粒子纠缠态及其正交态的概率克隆方案.此方案中,发送方Alice和接收方Bob对未知态的信息一无所知.首先Alice对他的粒子实施贝尔测量,在得知Alice的测量结果后,通过引入辅助粒子并执行控制非门操作后,Bob可成功地接收未知态.随后在态的制备方Victor的帮助下,Alice以一定的概率获得未知二粒子纠缠态及其正交态的复制.该方案同样适合量子信道是非最大纠缠态的情况.此外,量子纠缠资源和经典信息损耗在该方案中均得到了节省.We proposed a protocol for probabilistic cloning of an unknown two - particle entangled state and orthogonal complement state based on three particle GHZ state. In this scheme, the state which Alice wants to cloning was completely unknown and arbitrary for Alice and Bob. First, Alice made Bell measurement on his particles and sended his measurement results to Bob via classical channel. After having received Alice classical message, Bob could reconstruct the original state on her particles by unitary operation and controlnot gate operation. Second, Alice could produce the perfect copies and complement copies of an unknown state with assistance of the state preparer. Our scheme also fit to the case that the quantum channel was nonmaximally. Furthermore, the quantum entangled resource and the classical communication cost were greatly reduced compared with other protocol.

关 键 词：GHZ态 量子克隆 贝尔测量 二粒子投影测量 

分 类 号：O413[理学—理论物理]