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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Thermal quantum correlations in a two-qubit Heisenberg XXZ spin-1/2 chain under an inhomogeneous magnetic field
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Thermal quantum correlations in a two-qubit Heisenberg XXZ spin-1/2 chain under an inhomogeneous magnetic field

机译：在不均匀磁场下的双态Heisenberg XXZ Spin-1/2链中的热量子相关性

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摘要

The thermal quantum correlations in a two-qubit one-dimensional XXZ Heisenberg spin-1/2 chain subjected to an inhomogeneous magnetic field are investigated. The concurrence, as thermal entanglement quantifier, and the discord-like quantifiers, namely the trace distance discord and local quantum uncertainty, are computed. Their dependence on the anisotropy parameter gamma, uniform magnetic field B, coupling constant J and nonuniform magnetic field b are presented in detail. The mentioned quantifiers behaviors in terms of this parameters are compared and discussed. The results show that TDD is always much stronger than the concurrence and LQU, whereas the latter two show a swinging behavior depending on system parameters. Also, we have shown that the nonuniform magnetic field can reduce the effects of temperature on thermal correlations. Furthermore, the thermal correlations, for fixed values of b, can be enhanced in the antiferromagnetic system in comparison to the ferromagnetic one. In addition, the quantum correlations amounts in the ferromagnetic system are deteriorated when gamma decreases, but they are improved when the system is antiferromagnetic.
机译：研究了经受不均匀磁场的双量标一维XXZ Heisenberg旋转-1 / 2链中的热量子相关性。计算同时，作为热缠绕量化，以及不间断的量化器，即跟踪距离不和谐和局部量子不确定性。它们对各向异性参数伽马，均匀磁场B，耦合常数J和非均匀磁场B的依赖性进行了详细介绍。比较和讨论该参数的所提份量词行为。结果表明，TDD总是比并发和LQ的要强大，而后者两者则表现出摆动行为，具体取决于系统参数。此外，我们已经表明，非均匀磁场可以降低温度对热相关的影响。此外，与铁磁系统相比，在反铁磁系统中可以增强用于B的固定值的热相关性。另外，当伽马减少时，铁磁系统中的量子相关量劣化，但是当系统是反铁磁时，它们得到改善。

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