Thermal quantum correlations in a two-dimensional spin star model

被引：28
|
作者：
Haddadi, Saeed [1 ,2 ]
Pourkarimi, Mohammad Reza [3 ]
Akhound, Ahmad [2 ]
Ghominejad, Mehrdad [1 ]
机构：
[1] Semnan Univ, Fac Phys, POB 35195-363, Semnan, Iran
[2] Payame Noor Univ, Dept Phys, POB 19395-3697, Tehran, Iran
[3] Farsi Univ Kazerun, Dept Phys, Kazerun, Iran
来源：
MODERN PHYSICS LETTERS A | 2019年 / 34卷 / 22期
关键词：
Quantum correlations; spin star model; concurrence; quantum discord; MULTIPARTITE ENTANGLEMENT; SQUEEZING MODEL; DISCORD; BIPARTITE; DYNAMICS; SYSTEM;
D O I：
10.1142/S021773231950175X
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
In this paper, we study the thermal evolution of three types of quantum correlations under the homogeneous and inhomogeneous spin star Hamiltonian. It is shown that quantum discord (QD) is more stable than the other measures in the thermal regime, but concurrence is more efficient when the Hamiltonian parameters are employed. However, all quantum correlations can reach their maximum, if the inhomogeneous parameter raises. Quantum correlations can be enhanced by a weak external magnetic field and strong coupling parameter. But they vanish in the case of a strong magnetic field, weak coupling parameter, and high temperatures.
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页数：15
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