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.
Received: 28 November 2008
Revised: 03 December 2008
Accepted manuscript online:
PACS:
42.50.Gy
(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
Fund: 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).
Cite this article:
Zhang Jian-Song(张建松) and Xu Jing-Bo(许晶波) Entanglement and coherence of a three-level atom in $\Lambda$ configuration interacting with two fields 2009 Chin. Phys. B 18 2288
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