物理学报2011，Vol.60Issue(12)：13-19,7.
具有Dzyaloshinskii-Moriya相互作用的四量子比特海森堡XXZ模型中的热纠缠
Thermal entanglement in the four-qubit Heisenberg XXZ model with the Dzyaloshinskii-Moriya interaction
摘要
Abstract
In this paper,we study the property of thermal entanglement in four-qubit Heisenberg model,where Dzyaloshinskii-Moriya （DM） interaction is considered,and investigate the pairwise concurrences of two nearest-neighbor qubits and two next-neighbor qubits to study this entanglement property.The result shows that for the two-next-neighbor-qubit case,there exists pairwise concurrence neigher in ferromagnetic model nor in antiferromagnetic model;but for the two-nearest-neighbor-qubits case,the DM interaction and the parameter of the anisotropy exchange coupling Δ have a significant influence on the pairwise entanglement and critical temperature Tc.Moreover,the pairwise concurrence will decrease with the increase of temperature.When the temperature execeds its critical value,the pairwise concurrence disappears.Therefore,the pairwise entanglement can be controlled and enhanced by choosing the appropriate parameters of the DM interaction and the anisotropy exchange coupling.关键词
配对纠缠/XXZ模型/Dzyaloshinskii-Moriya相互作用Key words
pairwise entanglement/XXZ model/Dzyaloshinskii-Moriya interaction分类
数理科学引用本文复制引用
张英丽,周斌..具有Dzyaloshinskii-Moriya相互作用的四量子比特海森堡XXZ模型中的热纠缠[J].物理学报,2011,60(12):13-19,7.基金项目
国家自然科学基金 （）
湖北省自然科学基金 （）
湖北省教育厅科研计划重点项目（批准号：D20101004）资助的课题 （）
