Measurement-induced disturbance and nonequilibrium thermal entanglement in a qutrit–qubit mixed spin XXZ model

doi:10.1088/1674-1056/20/10/100311

中国物理B ›› 2011, Vol. 20 ›› Issue (10): 100311-100311.doi: 10.1088/1674-1056/20/10/100311

Measurement-induced disturbance and nonequilibrium thermal entanglement in a qutrit–qubit mixed spin XXZ model

陈丽¹, 邵晓强¹, 张寿²

(1)Centre for the Condensed-Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China; (2)Centre for the Condensed-Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China; Department of Physics, College of Science, Yanbian University, Yanji 133002, China

收稿日期:2011-03-16 修回日期:2011-05-27 出版日期:2011-10-15 发布日期:2011-10-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61068001 and 11064016).

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

Received:2011-03-16 Revised:2011-05-27 Online:2011-10-15 Published:2011-10-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61068001 and 11064016).

摘要/Abstract

摘要： 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.

关键词: measurement-induced disturbance, entanglement

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.

Key words: measurement-induced disturbance, entanglement

中图分类号: (Entanglement measures, witnesses, and other characterizations)

03.67.Mn

03.65.Ta (Foundations of quantum mechanics; measurement theory) 75.10.Jm (Quantized spin models, including quantum spin frustration)

陈丽, 邵晓强, 张寿. Measurement-induced disturbance and nonequilibrium thermal entanglement in a qutrit–qubit mixed spin XXZ model[J]. 中国物理B, 2011, 20(10): 100311-100311.

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[J]. Chin. Phys. B, 2011, 20(10): 100311-100311.

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Measurement-induced disturbance and nonequilibrium thermal entanglement in a qutrit–qubit mixed spin XXZ model

Measurement-induced disturbance and nonequilibrium thermal entanglement in a qutrit–qubit mixed spin XXZ model

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