中国物理B ›› 2009, Vol. 18 ›› Issue (7): 2794-2800.doi: 10.1088/1674-1056/18/7/029

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Quantum entanglement between the two-mode fields and atomic entropy squeezing in the system of a moving atom interacting with two-mode entangled coherent field

邹艳, 李永平   

  1. Department of Physics, Dezhou University, Dezhou 253023, China Key Biophysics Laboratory in Universities of Shandong, Dezhou 253023, China
  • 收稿日期:2008-12-03 修回日期:2009-01-17 出版日期:2009-07-20 发布日期:2009-07-20
  • 基金资助:
    Project supported by the Scientific and Technological Program Foundation of Dezhou, Shandong Province of China (Grant No 20080153) and the Scientific Research Fund of Dezhou University of China (Grant No 07024).

Quantum entanglement between the two-mode fields and atomic entropy squeezing in the system of a moving atom interacting with two-mode entangled coherent field

Zou Yan(邹艳)† and Li Yong-Ping(李永平)   

  1. Department of Physics, Dezhou University, Dezhou 253023, China Key Biophysics Laboratory in Universities of Shandong, Dezhou 253023, China
  • Received:2008-12-03 Revised:2009-01-17 Online:2009-07-20 Published:2009-07-20
  • Supported by:
    Project supported by the Scientific and Technological Program Foundation of Dezhou, Shandong Province of China (Grant No 20080153) and the Scientific Research Fund of Dezhou University of China (Grant No 07024).

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摘要： This paper investigates the entropy squeezing of a moving two-level atom interacting with the two-mode entangled coherent field via two-photon transition by using an entropic uncertainty relation and the degree of entanglement between the two-mode fields by using quantum relative entropy. The results obtained from numerical calculation indicate that the squeezed period, the duration of entropy squeezing and the maximal squeezing can be controlled by appropriately choosing the intensity of the light field, the atomic motion and the field-mode structure. The atomic motion leads to the periodic recovery of the initial maximal degree of entanglement between the two-mode fields. Moreover, there exists a corresponding relation between the time evolution properties of the atomic entropy squeezing and those of the entanglement between the two-mode fields.

Abstract: This paper investigates the entropy squeezing of a moving two-level atom interacting with the two-mode entangled coherent field via two-photon transition by using an entropic uncertainty relation and the degree of entanglement between the two-mode fields by using quantum relative entropy. The results obtained from numerical calculation indicate that the squeezed period, the duration of entropy squeezing and the maximal squeezing can be controlled by appropriately choosing the intensity of the light field, the atomic motion and the field-mode structure. The atomic motion leads to the periodic recovery of the initial maximal degree of entanglement between the two-mode fields. Moreover, there exists a corresponding relation between the time evolution properties of the atomic entropy squeezing and those of the entanglement between the two-mode fields.

Key words: entropy squeezing, quantum relative entropy, atomic motion and field-mode structure, two-mode entangled light field

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
03.67.Mn (Entanglement measures, witnesses, and other characterizations) 42.50.Dv (Quantum state engineering and measurements) 42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)