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.
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)
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.
