摘要:
研究四量子比特海森堡XXZ模型中配对纠缠的性质,在该系统中引入了Dzyaloshinskii-Moriya（DM）相互作用,通过求解配对纠缠度来讨论最近邻和次近邻两量子比特之间的热纠缠性质.研究结果表明：对于铁磁和反铁磁两种情形而言,次近邻两量子比特之间不存在配对热纠缠;但在最近邻两量子比特情况时,DM相互作用和各向异性参数Δ对配对热纠缠和临界温度Tc都具有重要的影响,且随着温度T的增加,配对纠缠度逐渐减小直至消失.因此,选择和调整合适的DM相互作用和各向异性参数,可以有效地控制和提高配对热纠缠.
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.
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