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论文类型： 期刊论文

发表时间： 2011-05-01

发表刊物： CHINESE PHYSICS B

收录刊物： Scopus、SCIE、EI、ISTIC

卷号： 20

期号： 5

ISSN号： 1674-1056

关键字： quantum discord; quantum phase transition; XY spin-chain

摘要： This paper studies the discord of a bipartite two-level system coupling to an XY spin-chain environment in a transverse field and investigates the relationship between the discord property and the environment's quantum phase transition. The results show that the quantum discord is also able to characterize the quantum phase transitions. We also discuss the difference between discord and entanglement, and show that quantum discord may reveal more general information than quantum entanglement for characterizing the environment's quantum phase transition.