Hits:

Indexed by:期刊论文

Date of Publication:2008-02-25

Journal:PHYSICS LETTERS A

Included Journals:SCIE

Volume:372

Issue:9

Page Number:1387-1390

ISSN No.:0375-9601

Key Words:decoherence; Fermion environment; phase transition

Abstract: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.