中国物理B ›› 2010, Vol. 19 ›› Issue (7): 70302-070302.doi: 10.1088/1674-1056/19/7/070302

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Control of entanglement between two atoms by the Stark shift

方卯发1, 胡要花2   

  1. (1)Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Physics and Information Science College, Hunan Normal University, Changsha 410081,China; (2)Physics and Information Engineering College, Luoyang Normal College, Luoyang 471022, China
  • 出版日期:2010-07-15 发布日期:2010-07-15
  • 基金资助:
    Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 10905028), the Natural Science Foundation of Hunan Province of China (Grant No. 07JJ3013), the Program for Science and Technology Department of Henan Province of China (Grant No. 102300410050) and by the Foundation of Hunan Provincial Education Department of China (Grant No. 06A038).

Control of entanglement between two atoms by the Stark shift

Hu Yao-Hua(胡要花)a)† and Fang Mao-Fa(方卯发) b)   

  1. a Physics and Information Engineering College, Luoyang Normal College, Luoyang 471022, China; b Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Physics and Information Science College, Hunan Normal University, Changsha 410081,China
  • Online:2010-07-15 Published:2010-07-15
  • Supported by:
    Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 10905028), the Natural Science Foundation of Hunan Province of China (Grant No. 07JJ3013), the Program for Science and Technology Department of Henan Province of China (Grant No. 102300410050) and by the Foundation of Hunan Provincial Education Department of China (Grant No. 06A038).

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摘要： Considering a quantum model consisting of two effective two-level atoms and a single-mode cavity, this paper investigates the entanglement dynamics between the two atoms, and studies the effect of the Stark shift on the entanglement. The results show that, on the one hand the atom—atom entanglement evolves periodically with time and the periods are affected by the Stark shift; on the other hand, the two atoms are not disentangled at any time when the Stark shift is considered, and for large values of the Stark shift parameter, the two atoms can remain in a stationary entangled state. In addition, for the initially partially entangled atomic state, the atom—atom entanglement can be greatly enhanced due to the presence of Stark shift. These properties show that the Stark shift can be used to control entanglement between two atoms.

Abstract: Considering a quantum model consisting of two effective two-level atoms and a single-mode cavity, this paper investigates the entanglement dynamics between the two atoms, and studies the effect of the Stark shift on the entanglement. The results show that, on the one hand the atom—atom entanglement evolves periodically with time and the periods are affected by the Stark shift; on the other hand, the two atoms are not disentangled at any time when the Stark shift is considered, and for large values of the Stark shift parameter, the two atoms can remain in a stationary entangled state. In addition, for the initially partially entangled atomic state, the atom—atom entanglement can be greatly enhanced due to the presence of Stark shift. These properties show that the Stark shift can be used to control entanglement between two atoms.

Key words: entanglement, Stark shift, control

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

  • 42.50.Dv
03.67.Mn (Entanglement measures, witnesses, and other characterizations) 37.10.Vz (Mechanical effects of light on atoms, molecules, and ions) 32.60.+i (Zeeman and Stark effects) 32.80.-t (Photoionization and excitation) 03.65.Ud (Entanglement and quantum nonlocality)