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Indexed by:期刊论文

Date of Publication:2008-05-01

Journal:OPTICS COMMUNICATIONS

Included Journals:SCIE、EI

Volume:281

Issue:9

Page Number:2695-2699

ISSN No.:0030-4018

Key Words:three-level atom; the quantum entropy; entanglement

Abstract: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.