Effect of Dzialoshinski–Moriya interaction on the quantum discord of a spin-star model

The effect of Dzialoshinski–Moriya (DM) interaction on the quantum discord and the thermal entanglement of the density matrix of a spin star model is investigated. Our results imply that the quantum correlation measured by quantum discord and thermal entanglement can be established between two surro...

Full description

Saved in:
Bibliographic Details
Published in:Physica A 2012-04, Vol.391 (7), p.2500-2506
Main Authors: Ma, Xiao San, Cheng, Mu-Tian, Zhao, Guang-Xing, Wang, An Min
Format: Article
Language:English
Subjects:
Correlation analysis
Density
Dzialoshinski–Moriya interaction
Entanglement
Magnetic fields
Mathematical models
Quantum discord
Stars
Statistical mechanics
Thermal entanglement
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The effect of Dzialoshinski–Moriya (DM) interaction on the quantum discord and the thermal entanglement of the density matrix of a spin star model is investigated. Our results imply that the quantum correlation measured by quantum discord and thermal entanglement can be established between two surrounding parties both of which have no interaction with each other but interact with the central party independently. From the analysis, we find that the strong DM interaction can enhance the quantum discord and thermal entanglement while the external magnetic field with a large value and the high temperature can shrink them. Specially, the quantum discord is more robust than the thermal entanglement in the sense that the range of parameters in which the quantum discord takes a zero value is much smaller than that of the thermal entanglement. ► Effect of DM interaction on quantum discord of a spin star model is studied. ► Quantum discord and thermal entanglement of a spin star model are compared. ► Increasing DM interaction can enhance the quantum discord and thermal entanglement. ► Increasing the magnetic field and temperature will shrink the quantum correlation. ► Quantum discord can survive higher temperatures than the thermal entanglement does.
ISSN:0378-4371
1873-2119
DOI:10.1016/j.physa.2011.12.016