量子比特的普适远程翻转和克隆  

Universal quantum teleflipping and telecloning of qubit

作　　者：李艳玲[1,2] 冯健[1,2] 孟祥国[1,2] 梁宝龙[1,2] 

机构地区：[1]聊城大学物理科学与信息工程学院,聊城252059 [2]聊城大学光通信研究所,聊城252059

出　　处：《物理学报》2007年第10期5591-5596,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10574060);山东省自然科学基金(批准号:Y2004A09)资助的课题~~

摘　　要：提出一种把量子隐形传态、最佳普适量子比特翻转和最佳普适量子克隆三者结合起来的量子比特普适远程翻转和克隆方案.当发送者和处于不同地点的三个接收者共享一个特定的四粒子纠缠态作为量子信道时,通过发送者的Bell基测量、经典通信和各个接收者的局域幺正变换,一个接收者能够以2/3的最佳保真度得到一份原未知量子比特的正交补态,另外两个接收者能够分别以5/6的最佳保真度得到原未知量子比特的一份拷贝.此方案用较少的量子纠缠资源同时完成了未知量子比特的普适远程翻转和克隆,且其保真度分别达到了最佳.实现此方案的关键在于构造出发送者和接收者共享的特定四粒子纠缠态作为量子信道,分析了此特殊四粒子态内在的纠缠结构.A scheme combining three processes of quantum teleportation, optimal universal quantum flipping and optimal universal quantum cloning for universal teleflipping and telecloning of arbitrary qubit is proposed. When a particular four-particle entangled state shared by the sender and three spatially separated receivers is used as quantum information channel, after the sender＇ s Bell measurement, classical communication and each receiver＇s local unitary operation, one receiver can get one orthogonal complementing state of the original unknown state with the optimal fidelity of 2/3, the other two receivers can respectively get one ~opy of the original unknown state with the optimal fidelity of 5/6. This scheme implements the universal quantum teleflipping and telecloning simultaneously with corresponding optimal fidelity by using the reduced entanglement. The key to realizing this scheme is the construction of the particular four-particle entangled state shared by the sender and three receivers used as quantum information channel. The entanglement structure of the special four-particle entangled state is analyzed.

关 键 词：量子比特 量子远程翻转 量子远程克隆 保真度 

分 类 号：O413.1[理学—理论物理]