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Measurement-induced disturbance and nonequilibrium thermal entanglement in a qutrit–qubit mixed spin XXZ model |
| Chen Li(陈丽)a), Shao Xiao-Qiang(邵晓强)a), and Zhang Shou(张寿)a)b)† |
| a Centre for the Condensed-Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China; b Department of Physics, College of Science, Yanbian University, Yanji 133002, China |
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Abstract We investigate the dynamics of nonequilibrium thermal quantum correlation of a qutrit-qubit mixed spin system coupled to two bosonic reservoirs at different temperatures using measurement-induced disturbance. The effects of initial states of the spins and temperatures of the reservoirs on measurement-induced disturbance and entanglement are discussed. The results demonstrate that measurement-induced disturbance is more robust than entanglement against the influence of both these factors and there is no sudden death phenomenon for measurement-induced disturbance. The dependences of steady-state measurement-induced disturbance and entanglement on coupling constant and anisotropy parameter are also studied. Steady-state entanglement vanishes for a ferromagnetic qutrit-qubit model, while steady-state measurement-induced disturbance exists for both the antiferromagnetic and ferromagnetic cases. Appropriately modulating the coupling constant and anisotropy parameter can strengthen quantum correlation.
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Received: 16 March 2011
Revised: 27 May 2011
Accepted manuscript online:
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PACS:
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03.67.Mn
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(Entanglement measures, witnesses, and other characterizations)
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03.65.Ta
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(Foundations of quantum mechanics; measurement theory)
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75.10.Jm
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(Quantized spin models, including quantum spin frustration)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61068001 and 11064016). |
Cite this article:
Chen Li(陈丽), Shao Xiao-Qiang(邵晓强), and Zhang Shou(张寿) Measurement-induced disturbance and nonequilibrium thermal entanglement in a qutrit–qubit mixed spin XXZ model 2011 Chin. Phys. B 20 100311
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