A simple scheme for implementing four-atom quantum dense coding in cavity QED  

作　　者：郑小娟 徐慧 方卯发 朱开成 

机构地区：[1]School of Material Science and Engineering,Central South University [2]School of Physics Science and Technology,Central South University [3]College of Physics and Information Science,Hunan Normal University

出　　处：《Chinese Physics B》2010年第1期72-76,共5页中国物理B（英文版）

基　　金：Project supported by the Postdoctal Foundation of Central South University of China, the Important Program of Hunan Provincial Education Department (Grant No. 06A038);Department of Education of Hunan Province of China (Grant No. 06C080);Hunan Provincial Natural Science Foundation, China (Grant No. 07JJ3013)

摘　　要：An experimentally feasible scheme for implementing four-atom quantum dense coding of an atom-cavity system is proposed. The cavity is only virtually excited and no quantum information will be transferred from the atoms to the cavity. Thus the scheme is insensitive to cavity decay and the thermal field. In the scheme, Alice can send faithfully 4 bits of classical information to Bob by sending two qubits. Generalized Bell states can be exactly distinguished by detecting the atomic state, and quantum dense coding can be realized in a simple way.An experimentally feasible scheme for implementing four-atom quantum dense coding of an atom-cavity system is proposed. The cavity is only virtually excited and no quantum information will be transferred from the atoms to the cavity. Thus the scheme is insensitive to cavity decay and the thermal field. In the scheme, Alice can send faithfully 4 bits of classical information to Bob by sending two qubits. Generalized Bell states can be exactly distinguished by detecting the atomic state, and quantum dense coding can be realized in a simple way.

关 键 词：cavity quantum electrodynamics（QED） quantum dense coding 

分 类 号：O431.2[机械工程—光学工程] O562[理学—光学]