Discord under the influence of a quantum phase transition

doi:10.1088/1674-1056/20/5/050306

Abstract 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.

Keywords: quantum discord quantum phase transition XY spin-chain

Received: 25 September 2010
Revised: 30 December 2010
Accepted manuscript online:

PACS:	03.67.-a	(Quantum information)
	03.65.Yz	(Decoherence; open systems; quantum statistical methods)
	05.70.Jk	(Critical point phenomena)
	75.10.Pq	(Spin chain models)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10905007 and 61078011) and the Fundamental Research Funds for the Central Universities, China.

Cite this article:

Wang Lin-Cheng (王林成), Shen Jian (申健), Yi Xue-Xi (衣学喜) Discord under the influence of a quantum phase transition 2011 Chin. Phys. B 20 050306

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