Thermal quantum discord in Heisenberg models with Dzyaloshinski–Moriya interaction

doi:10.1088/1674-1056/20/4/040305

Abstract We study the quantum discord of the bipartite Heisenberg model with the Dzyaloshinski-Moriya (DM) interaction in thermal equilibrium state and discuss the effect of the DM interaction on the quantum discord. The quantum entanglement of the system is also discussed and compared with quantum discord. Our results show that the quantum discord may reveal more properties of the system than quantum entanglement and the DM interaction may play an important role in the Heisenberg model.

Keywords: quantum discord thermal equilibrium state Heisenberg model Dzyaloshinski--Moriya interaction

Received: 09 September 2010
Revised: 04 January 2011
Accepted manuscript online:

PACS:	03.65.Ud	(Entanglement and quantum nonlocality)
	75.10.Pq	(Spin chain models)
	05.30.-d	(Quantum statistical mechanics)

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.

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Wang Lin-Cheng(王林成), Yan Jun-Yan(闫俊彦), and Yi Xue-Xi(衣学喜) Thermal quantum discord in Heisenberg models with Dzyaloshinski–Moriya interaction 2011 Chin. Phys. B 20 040305

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Thermal quantum discord in Heisenberg models with Dzyaloshinski–Moriya interaction

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