中国物理B ›› 2009, Vol. 18 ›› Issue (11): 4662-4666.doi: 10.1088/1674-1056/18/11/009

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Entanglement evolution of a two-qubit system with decay beyond the rotating-wave approximation

曹卓良1, 杨青2, 杨名2, 李大创2   

  1. (1)Department of Physics, Hefei Teachers College, Hefei 230061, China; (2)Key Laboratory of Opto-electronic Information Acquisition and Manipulation (Ministry of Education), School of Physics & Material Science, Anhui University, Hefei 230039, China
  • 收稿日期:2009-02-25 修回日期:2009-03-27 出版日期:2009-11-20 发布日期:2009-11-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 60678022 and 10704001), the Specialized Research Fund for the Doctoral Program of Higher Education (Grant No 20060357008), Anhui Provincial Natural Science Foundation of China (Grant No 070412060), the Key Program of the Education Department of Anhui Province of China (Grant No KJ2008A28ZC) and Anhui Key Laboratory of Information Materials and Devices (Anhui University of China).

Entanglement evolution of a two-qubit system with decay beyond the rotating-wave approximation

Yang Qing(杨青)a), Yang Ming(杨名)a), Li Da-Chuang(李大创)a), and Cao Zhuo-Liang(曹卓良)b)†   

  1. a Key Laboratory of Opto-electronic Information Acquisition and Manipulation (Ministry of Education), School of Physics & Material Science, Anhui University, Hefei 230039, China; b Department of Physics, Hefei Teachers College, Hefei 230061, China
  • Received:2009-02-25 Revised:2009-03-27 Online:2009-11-20 Published:2009-11-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 60678022 and 10704001), the Specialized Research Fund for the Doctoral Program of Higher Education (Grant No 20060357008), Anhui Provincial Natural Science Foundation of China (Grant No 070412060), the Key Program of the Education Department of Anhui Province of China (Grant No KJ2008A28ZC) and Anhui Key Laboratory of Information Materials and Devices (Anhui University of China).

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摘要： The entanglement property of two identical atoms, initially entangled in Bell states, coupled to a single-mode cavity is considered. Based on the reduced non-perturbative quantum master equation method, the entanglement evolution of the two atoms with decay is investigated beyond the conventional rotating-wave approximation. We show that the counter-rotating wave terms, usually neglected, have a great influence on the disentanglement behaviour of the system. The phenomena of entanglement sudden death and entanglement sudden birth will occur. In addition, we show that the entanglement can be strengthened by introducing the dipole--dipole interaction of the two atoms.

Abstract: The entanglement property of two identical atoms, initially entangled in Bell states, coupled to a single-mode cavity is considered. Based on the reduced non-perturbative quantum master equation method, the entanglement evolution of the two atoms with decay is investigated beyond the conventional rotating-wave approximation. We show that the counter-rotating wave terms, usually neglected, have a great influence on the disentanglement behaviour of the system. The phenomena of entanglement sudden death and entanglement sudden birth will occur. In addition, we show that the entanglement can be strengthened by introducing the dipole--dipole interaction of the two atoms.

Key words: quantum entanglement, beyond rotating-wave approximation

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
03.67.Lx (Quantum computation architectures and implementations) 03.67.Mn (Entanglement measures, witnesses, and other characterizations) 42.50.Dv (Quantum state engineering and measurements)