中国物理B ›› 2007, Vol. 16 ›› Issue (2): 420-428.doi: 10.1088/1009-1963/16/2/023

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Entropy squeezing of a moving atom and control of noise of the quantum mechanical channel via the two-photon process

周清平1, 周并举2, 刘明伟2, 刘小娟3   

  1. (1)Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; (2)Department of Physics, Hunan University of Science and Technology, Xiangtan 411201, China; (3)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
  • 收稿日期:2006-05-22 修回日期:2006-09-01 出版日期:2007-02-20 发布日期:2007-02-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025), the Natural Science Foundation of Hunan Province, China (Grant No 05JJ30004) and the Scientific Research Fund of Hunan Provincial Education Department, China (Grant No 03c543)

Entropy squeezing of a moving atom and control of noise of the quantum mechanical channel via the two-photon process

Zhou Bing-Ju(周并举)a), Liu Xiao-Juan(刘小娟)a)b)†, Zhou Qing-Ping(周清平)b), and Liu Ming-Wei(刘明伟)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
  • Received:2006-05-22 Revised:2006-09-01 Online:2007-02-20 Published:2007-02-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025), the Natural Science Foundation of Hunan Province, China (Grant No 05JJ30004) and the Scientific Research Fund of Hunan Provincial Education Department, China (Grant No 03c543)

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摘要： Based on the quantum information theory, we have investigated the entropy squeezing of a moving two-level atom interacting with the coherent field via the quantum mechanical channel of the two-photon process. The results are compared with those of atomic squeezing based on the Heisenberg uncertainty relation. The influences of the atomic motion and field-mode structure parameter on the atomic entropy squeezing and on the control of noise of the quantum mechanical channel via the two-photon process are examined. Our results show that the squeezed period, duration of optimal entropy squeezing of a two-level atom and the noise of the quantum mechanical channel can be controlled by appropriately choosing the atomic motion and the field-mode structure parameter, respectively. The quantum mechanical channel of two-photon process is an ideal channel for quantum information (atomic quantum state) transmission. Quantum information entropy is a remarkably accurate measure of the atomic squeezing.

关键词: entropy squeezing, atomic motion and field-mode structure, quantum mechanical channel, two-photon process

Abstract: Based on the quantum information theory, we have investigated the entropy squeezing of a moving two-level atom interacting with the coherent field via the quantum mechanical channel of the two-photon process. The results are compared with those of atomic squeezing based on the Heisenberg uncertainty relation. The influences of the atomic motion and field-mode structure parameter on the atomic entropy squeezing and on the control of noise of the quantum mechanical channel via the two-photon process are examined. Our results show that the squeezed period, duration of optimal entropy squeezing of a two-level atom and the noise of the quantum mechanical channel can be controlled by appropriately choosing the atomic motion and the field-mode structure parameter, respectively. The quantum mechanical channel of two-photon process is an ideal channel for quantum information (atomic quantum state) transmission. Quantum information entropy is a remarkably accurate measure of the atomic squeezing.

Key words: entropy squeezing, atomic motion and field-mode structure, quantum mechanical channel, two-photon process

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

  • 42.50.Dv
03.67.-a (Quantum information) 42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift) 42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)