外磁场中Ising-XYZ金刚石链结构的成对热纠缠
Pairwise thermal entanglement in Ising-XYZ diamond chain structure in an external magnetic field
摘要：
量子纠缠是最迷人的关联类型之一，只能在量子系统中共享。海森伯链是最简单的量子链之一，由于自旋系统中的海森伯相互作用是量子耦合的，所以海森伯链具有到达纠缠的特性。这两个粒子通过XYZ耦合耦合或简单地称为两量子比特XYZ自旋，这是导致热纠缠出现的原因。这些双量子位算符与两个节点伊辛自旋结合，这个过程无限重复，从而形成钻石链结构。我们将讨论两量子比特的热纠缠对Ising-XYZ金刚石链结构的影响。利用两量子比特密度算符元可以直接得到纠缠度，利用这个结果，我们研究了热纠缠，以及纠缠消失的阈值温度。该模型表现出一种非常不寻常的并发行为，如两个纠缠区的边界变成了一个解纠缠区，这与海森堡耦合中XY各向异性有着内在的联系。尽管只有两个量子比特发现了类似的性质，但在这里，我们展示了钻石链结构的情况，它合理地代表了真实的材料。
英文摘要：
Quantum entanglement is one of the most fascinating types of correlation that can be shared only among quantum systems. The Heisenberg chain is one of the simplest quantum chains which exhibits a reach entanglement feature, due to the Heisenberg interaction is quantum coupling in the spin system. The two particles were coupled trough XYZ coupling or simply called as two-qubit XYZ spin, which are the responsible for the emergence of thermal entanglement. These two-qubit operators are bonded to two nodal Ising spins, and this process is repeated infinitely resulting in a diamond chain structure. We will discuss two-qubit thermal entanglement effect on Ising-XYZ diamond chain structure. The concurrence could be obtained straightforwardly in terms of two-qubit density operator elements, using this result, we study the thermal entanglement, as well as the threshold temperature where entangled state vanishes. The present model displays a quite unusual concurrence behavior, such as, the boundary of two entangled regions becomes a disentangled region, this is intrinsically related to the XY-anisotropy in the Heisenberg coupling. Despite a similar property had been found for only two-qubit, here we show in the case of a diamond chain structure, which reasonably represents real materials.
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