中国物理B ›› 2013, Vol. 22 ›› Issue (2): 20309-020309.doi: 10.1088/1674-1056/22/2/020309

• GENERAL • 上一篇    下一篇

Quantum correlation dynamics of three non-coupled two-level atoms in different reservoirs

王小云, 丁邦福, 赵鹤平   

  1. College of Physics and Mechanical & Electrical Engineering, Jishou University, Jishou 416000, China
  • 收稿日期:2012-04-04 修回日期:2012-07-06 出版日期:2013-01-01 发布日期:2013-01-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11104113 and 11264011) and the Natural Science Foundation of Hunan Province, China (Grant Nos. 09JJ6011 and 11JJ6007).

Quantum correlation dynamics of three non-coupled two-level atoms in different reservoirs

Wang Xiao-Yun (王小云), Ding Bang-Fu (丁邦福), Zhao He-Ping (赵鹤平)   

  1. College of Physics and Mechanical & Electrical Engineering, Jishou University, Jishou 416000, China
  • Received:2012-04-04 Revised:2012-07-06 Online:2013-01-01 Published:2013-01-01
  • Contact: Wang Xiao-Yun, Ding Bang-Fu E-mail:wxyyun@163.com; dbf1982@126.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11104113 and 11264011) and the Natural Science Foundation of Hunan Province, China (Grant Nos. 09JJ6011 and 11JJ6007).

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摘要： Time evolution dynamics of three non-coupled two-level atoms independently interacting with their reservoirs is solved exactly by considering a damping Lorentzian spectral density. For three atoms initially prepared in Greenberger-Horne-Zeilinger-type state, quantum correlation dynamics in Markovian reservoir is compared with that in non-Markovian reservoir. By increasing detuning quantity in non-Markovian reservoir, three-atom correlation dynamics measured by negative eigenvalue presents a trapping phenomenon which provides long-time quantum entanglement. Then we compare the correlation dynamics of three atoms with that of two atoms, measured by quantum entanglement and quantum discord for initial robuster-entangled type state. The result further confirms that quantum discord is indeed different from quantum entanglement in identifying quantum correlation of many bodies.

关键词: quantum correlation dynamics, Lorentzian spectral density, Markovian and non-Markovian reservoirs

Abstract: Time evolution dynamics of three non-coupled two-level atoms independently interacting with their reservoirs is solved exactly by considering a damping Lorentzian spectral density. For three atoms initially prepared in Greenberger-Horne-Zeilinger-type state, quantum correlation dynamics in Markovian reservoir is compared with that in non-Markovian reservoir. By increasing detuning quantity in non-Markovian reservoir, three-atom correlation dynamics measured by negative eigenvalue presents a trapping phenomenon which provides long-time quantum entanglement. Then we compare the correlation dynamics of three atoms with that of two atoms, measured by quantum entanglement and quantum discord for initial robuster-entangled type state. The result further confirms that quantum discord is indeed different from quantum entanglement in identifying quantum correlation of many bodies.

Key words: quantum correlation dynamics, Lorentzian spectral density, Markovian and non-Markovian reservoirs

中图分类号:  (Entanglement measures, witnesses, and other characterizations)

  • 03.67.Mn
03.65.Ud (Entanglement and quantum nonlocality) 03.65.Yz (Decoherence; open systems; quantum statistical methods)