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论文类型： 期刊论文

发表时间： 2009-05-01

发表刊物： COMMUNICATIONS IN THEORETICAL PHYSICS

收录刊物： SCIE、ISTIC、Scopus

卷号： 51

期号： 5

页面范围： 815-819

ISSN号： 0253-6102

关键字： disentanglement; quantum phase transition; XY spin chain

摘要： The disentanglement evolution of bipartite spin-1/2 system coupled to a common surrounding XY chain in transverse fields at nonzero temperature is studied in this letter. The dynamical process of the entanglement is numerically and analytically investigated. We find that thermal effects can enhance disentanglement if the entangled initial state of the central spins does not in the decoherence free space. The critical phenomenon of quantum phase transitions reflected in the disentanglement can be washed out by the thermal effect eventually.