二维J_1-J_2模型中四量子比特的热纠缠特性(英文)

The Four-qubit Thermal Entanglement in a Two-dimensional J_1-J_2 model

我们研究了二维J1-J2模型中三种四量子比特的热纠缠特性,结果发现,临界温度基本上随挫变参量α的增大而减小。我们也发现,通过选择合适的挫变参量α可以制备最大纠缠态。

We have investigated the thermal entanglement properties of three cases of four qubits in a two-dimensional J1 - J2 model by calculating the pairwise concurrence. It is found that the critical temperature where the entanglement vanishes almost decreases with the increase of the frustration parameter α. We have, also, found that the maximally entangled states can be generated in the third case by choosing the proper frustration parameter α.