中国物理B ›› 2010, Vol. 19 ›› Issue (1): 10309-010309.doi: 10.1088/1674-1056/19/1/010309

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

方卯发1, 郑小娟2, 徐慧2, 朱开成3   

  1. (1)College of Physics and Information Science, Hunan Normal University, Changsha 410081, China; (2)School of Material Science and Engineering, Central South University, Changsha 410083, China;School of Physics Science and Technology, Central South University, Changsha 410083, China; (3)School of Physics Science and Technology, Central South University, Changsha 410083, China
  • 收稿日期:2009-04-28 修回日期:2009-06-30 出版日期:2010-01-15 发布日期:2010-01-15
  • 基金资助:
    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), and Hunan Provincial Natural Science Foundation, China (Grant No. 07JJ3013).

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

Zheng Xiao-Juan(郑小娟)a)b), Xu Hui(徐慧)a)b)†, Fang Mao-Fa(方卯发)c), and Zhu Kai-Cheng(朱开成) b)   

  1. a School of Material Science and Engineering, Central South University, Changsha 410083, China; b School of Physics Science and Technology, Central South University, Changsha 410083, China; c School of Physics Science and Technology, Central South University, Changsha 410083, China
  • Received:2009-04-28 Revised:2009-06-30 Online:2010-01-15 Published:2010-01-15
  • Supported by:
    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), and Hunan Provincial Natural Science Foundation, China (Grant No. 07JJ3013).

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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.

Abstract: 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.

Key words: cavity quantum electrodynamics(QED), quantum dense coding

中图分类号:  (Cavity quantum electrodynamics; micromasers)

  • 42.50.Pq
03.65.Ud (Entanglement and quantum nonlocality) 03.67.Lx (Quantum computation architectures and implementations) 03.67.Mn (Entanglement measures, witnesses, and other characterizations) 42.50.Dv (Quantum state engineering and measurements)