Controlled Telecloning and Teleflipping for One-Qubit Pure States  

作　　者：ZHAN Xiao-Gui ZHANG Deng-Yu GAO Feng LI Yan-Ling ZENG Hao-Sheng 

机构地区：[1]Department of Physics, Hengyang Normal University, Hengyang 421008, China [2]Department of Physics, Hunan Normal University, Changsha 410081, China

出　　处：《Communications in Theoretical Physics》2009年第6期1023-1026,共4页理论物理通讯（英文版）

基　　金：supported by the Natural Science Foundation of Hunan Province under Grant No. 06JJ50118;the Key Project of Chinese Ministry of Education under Grant No. 206103;the National Natural Science Foundation of China under Grant No. 10775048;the National Fundamental Research Program of China under Grant No. 2007CB925204

摘　　要：We propose a scheme for realizing controlled 1→2 telecloning and 1 →1 teleflipping for one-qubit pure states via a quantum network including N agents. The quantum operations used in the information-transmission process are just only one Bell-state measurement, and a series of single-qubit operation. It is shown that the fidelities of the controlled telecloning and teleflipping are independent of the initial states and reach their optimal values of 5/6 and 2/3 respectively on the condition that all the agents collaborate. If any one agent does not cooperate, the fidelities become state-dependent and are always smaller than the corresponding optimal values. The average fidelities are equal to the balanced value 1/2, which implies that on average the state ineepted by any one of the receivers is a fuUy mixed state. Thus no information leaks out to any dishonest receivers. The security of telecloning and teleflipping have been increased greatly.

关 键 词：controlled telecloning controlled teleflipping AGENT 

分 类 号：O413.1[理学—理论物理] TP38[理学—物理]