中国物理B ›› 2009, Vol. 18 ›› Issue (4): 1328-1332.doi: 10.1088/1674-1056/18/4/006

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Two-mode excited entangled coherent states and their entanglement properties

周冬林, 匡乐满   

  1. Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China
  • 收稿日期:2008-04-01 修回日期:2008-08-24 出版日期:2009-04-20 发布日期:2009-04-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10775048 and 10325523), the National Fundamental Research Program of China (Grant No 2007CB925204), and the Funds from the Education Department of Hunan Province.

Two-mode excited entangled coherent states and their entanglement properties

Zhou Dong-Lin(周冬林), and Kuang Le-Man(匡乐满)†   

  1. Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China
  • Received:2008-04-01 Revised:2008-08-24 Online:2009-04-20 Published:2009-04-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10775048 and 10325523), the National Fundamental Research Program of China (Grant No 2007CB925204), and the Funds from the Education Department of Hunan Province.

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摘要： This paper introduces two types of two-mode excited entangled coherent states (TMEECSs) |Ψ±(α,m,n)>, studies their entanglement characteristics, and investigates the influence of photon excitations on quantum entanglement. It shows that for the state |Ψ+(α,m,m)> the two-mode photon excitations affect seriously entanglement character while the state |Ψ-(α,m,m)> is always a maximally entangled state, and shows how such states can be produced by using cavity quantum electrodynamics and quantum measurements. It finds that the entanglement amount of the TMEECSs is larger than that of the single-mode excited entangled coherent states with the same photon excitation number.

关键词: photon excitations, quantum entanglement, entangled coherent states

Abstract: This paper introduces two types of two-mode excited entangled coherent states (TMEECSs) $|\varPsi_{\pm}(\alpha,m,n)\rangle$, studies their entanglement characteristics, and investigates the influence of photon excitations on  quantum entanglement. It shows that for the state $|\varPsi_{+}(\alpha,m,m)\rangle$ the two-mode photon excitations affect seriously entanglement character while the  state $|\varPsi_{-}(\alpha,m,m)\rangle$ is always a maximally  entangled state, and shows how such states can be produced by using cavity quantum electrodynamics and quantum measurements. It finds that the entanglement amount of the TMEECSs is larger than that of the single-mode excited  entangled coherent states with the same photon excitation number.

Key words: photon excitations, quantum entanglement, entangled coherent states

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
42.50.Dv (Quantum state engineering and measurements) 42.50.Pq (Cavity quantum electrodynamics; micromasers) 03.67.Mn (Entanglement measures, witnesses, and other characterizations)