中国物理B ›› 2007, Vol. 16 ›› Issue (12): 3685-3691.doi: 10.1088/1009-1963/16/12/022

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Preparation and control of entangled states in the two-mode coherent fields interacting with a moving atom via two-photon process

周并举1, 刘明伟1, 李寿存1, 刘小娟2   

  1. (1)Department of Physics, Hunan University of Science and Technology, Xiangtan 411201, China; (2)Department of Physics, Hunan University of Science and Technology, Xiangtan 411201, China;Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
  • 出版日期:2007-12-20 发布日期:2007-12-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 19874020), the Natural Science Foundation of Hunan Province, China (Grant No 05JJ30004), and the Scientific Research Fund of Hunan Provincial Education Department, China(Grant

Preparation and control of entangled states in the two-mode coherent fields interacting with a moving atom via two-photon process

Liu Xiao-Juan(刘小娟)a)b)†, Zhou Bing-Ju(周并举)a), Liu Ming-Wei (刘明伟)a), and Li Shou-Cun(李寿存)a)   

  1. a Department of Physics, Hunan University of Science and Technology, Xiangtan 411201, China; b Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
  • Online:2007-12-20 Published:2007-12-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 19874020), the Natural Science Foundation of Hunan Province, China (Grant No 05JJ30004), and the Scientific Research Fund of Hunan Provincial Education Department, China(Grant

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摘要： We investigate the preparation and the control of entangled states in a system with the two-mode coherent fields interacting with a moving two-level atom via the two-photon transition. We discuss entanglement properties between the two-mode coherent fields and a moving two-level atom by using the quantum reduced entropy, and those between the two-mode coherent fields by using the quantum relative entropy. In addition, we examine the influences of the atomic motion and field-mode structure parameter $p$ on the quantum entanglement of the system. Our results show that the period and the duration of the prepared maximal atom-field entangled states and the frequency of maximal two-mode field entangled states can be controlled, and that a sustained entangled state of the two-mode field, which is independent of atomic motion and the evolution time, can be obtained, by choosing appropriately the parameters of atomic motion, field-mode structure, initial state and interaction time of the system.

关键词: two-mode coherent fields, entangled states, reduced entropy, relative entropy, atomic motion and field-mode structure

Abstract: We investigate the preparation and the control of entangled states in a system with the two-mode coherent fields interacting with a moving two-level atom via the two-photon transition. We discuss entanglement properties between the two-mode coherent fields and a moving two-level atom by using the quantum reduced entropy, and those between the two-mode coherent fields by using the quantum relative entropy. In addition, we examine the influences of the atomic motion and field-mode structure parameter $p$ on the quantum entanglement of the system. Our results show that the period and the duration of the prepared maximal atom-field entangled states and the frequency of maximal two-mode field entangled states can be controlled, and that a sustained entangled state of the two-mode field, which is independent of atomic motion and the evolution time, can be obtained, by choosing appropriately the parameters of atomic motion, field-mode structure, initial state and interaction time of the system.

Key words: two-mode coherent fields, entangled states, reduced entropy, relative entropy, atomic motion and field-mode structure

中图分类号:  (Quantum state engineering and measurements)

  • 42.50.Dv
32.80.Wr (Other multiphoton processes) 42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption) 37.10.Vz (Mechanical effects of light on atoms, molecules, and ions)