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 pe...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.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 11204061,61073048,11104057the Anhui Provincial Natural Science Foundation under Grant No 11040606M16+2 种基金the China Postdoctoral Science Foundation under Grant No 20110490825the Major Program of the Education Department of Anhui Province under Grant No KJ2010ZD08the Key Program of the Education Department of Anhui Province under Grant Nos KJ2012A244,KJ2011A243,KJ2012A020.
文摘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.
