Realization of Optimal Universal and Phase-Covariant Quantum Machines via Input-Output Cavities  

作　　者：WANG Cong-Rong LI Da-Chuang ZHANG Feng-Yuan XU Rui-Min 王从戎;李大创;张凤元;许瑞敏(School of Electronics and Information Engineering,Hefei Normal University,Hefei 230601;Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics,University of Science and Technology of China,Hefei 230026)

机构地区：[1]School of Electronics and Information Engineering,Hefei Normal University,Hefei 230601 [2]Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics,University of Science and Technology of China,Hefei 230026

出　　处：《Chinese Physics Letters》2013年第3期9-13,共5页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 11204061,61073048,11104057;the Anhui Provincial Natural Science Foundation under Grant No 11040606M16;the China Postdoctoral Science Foundation under Grant No 20110490825;the Major Program of the Education Department of Anhui Province under Grant No KJ2010ZD08;the Key Program of the Education Department of Anhui Province under Grant Nos KJ2012A244,KJ2011A243,KJ2012A020.

摘　　要：We present a scheme to realize a special quantum cloning machine via input-output cavities.The cloning machine can copy information from one atom to another distant atom.Choosing different parameters,the method can perform optimal symmetric(asymmetric)universal quantum cloning and optimal symmetric(asymmetric)phase-covariant cloning.Compared to previous schemes,our scheme is more insensitive to actual environmental noise and can get higher fidelity in a current cavity quantum electrodynamics system with an entangled state acting as a quantum channel than a single-photon pulse.

关 键 词：QUANTUM scheme asymmetric 

分 类 号：O41[理学—理论物理]