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论文类型： 期刊论文

发表时间： 2008-02-25

发表刊物： PHYSICS LETTERS A

收录刊物： SCIE

卷号： 372

期号： 9

页面范围： 1387-1390

ISSN号： 0375-9601

关键字： decoherence; Fermion environment; phase transition

摘要： The decoherence process characterized by Loschmidt echo (LE) in a two-level system dephasingly coupled to a fermion environment with phase transitions is studied in this Letter. The results show that the LE of the two-level system may act as a witness of the environment's phase transitions, which is similar to the relation between quantum phase transitions and the LE. (c) 2007 Elsevier B.V. All rights reserved.