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论文类型：期刊论文

发表时间：2008-05-01

发表刊物：OPTICS COMMUNICATIONS

收录刊物：SCIE、EI

卷号：281

期号：9

页面范围：2695-2699

ISSN号：0030-4018

关键字：three-level atom; the quantum entropy; entanglement

摘要：A driven three-level atom system in free-space is investigated. The quantum entropy between the three-level atom and its spontaneous field is calculated. The entanglement between them and the influence of the classical field 0 on the entanglement are studied. The result indicates that there is a steady entanglement between the three-level atom and its spontaneous field, and they cannot be disentangled even the classical field is very large. In addition, the entanglement of the k photons and q photons is studied, it shows the two field is entangled for short time evolution. (c) 2007 Elsevier B.V. All rights reserved.