Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2008-05-01

Journal: OPTICS COMMUNICATIONS

Included Journals: EI、SCIE

Volume: 281

Issue: 9

Page Number: 2695-2699

ISSN: 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.