中国物理B ›› 2009, Vol. 18 ›› Issue (6): 2288-2293.doi: 10.1088/1674-1056/18/6/029

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Entanglement and coherence of a three-level atom in Λ configuration interacting with two fields

张建松, 许晶波   

  1. Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang University, Hangzhou 310027, China
  • 收稿日期:2008-11-28 修回日期:2008-12-03 出版日期:2009-06-20 发布日期:2009-06-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10774131) and the National Key Project for Fundamental Research of China (Grant No 2006CB921403).

Entanglement and coherence of a three-level atom in $\Lambda$ configuration interacting with two fields

Zhang Jian-Song(张建松) and Xu Jing-Bo(许晶波)†   

  1. Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang University, Hangzhou 310027, China
  • Received:2008-11-28 Revised:2008-12-03 Online:2009-06-20 Published:2009-06-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10774131) and the National Key Project for Fundamental Research of China (Grant No 2006CB921403).

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摘要： We investigate the entanglement of a three-level atom in λ configuration interacting with two quantized field modes by using logarithmic negativity. Then, we study the relationship of the atomic coherence and the entanglement between two fields which are initially prepared in vacuum or thermal states. We find that if the two fields are prepared in thermal states, the atomic coherence can induce the entanglement between two thermal fields. However, there is no coherence-induced entanglement between two vacuum fields.

关键词: quantum entanglement, coherence, cavity QED

Abstract: We investigate the entanglement of a three-level atom in $\Lambda$ configuration interacting with two quantized field modes by using logarithmic negativity. Then, we study the relationship of the atomic coherence and the entanglement between two fields which are initially prepared in vacuum or thermal states. We find that if the two fields are prepared in thermal states, the atomic coherence can induce the entanglement between two thermal fields. However, there is no coherence-induced entanglement between two vacuum fields.

Key words: quantum entanglement, coherence, cavity QED

中图分类号:  (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)

  • 42.50.Gy
42.50.Dv (Quantum state engineering and measurements) 42.50.Pq (Cavity quantum electrodynamics; micromasers)