Thermal entanglement in a two-dimensional Heisenberg XY model

被引：14
|
作者：
Zhang, R
Zhu, SQ
机构：
[1] CCAST, World Lab, Beijing 100080, Peoples R China
[2] Suzhou Univ, Sch Phys Sci & Technol, Suzhou 215006, Peoples R China
来源：
PHYSICS LETTERS A | 2006年 / 348卷 / 3-6期
关键词：
thermal entanglement; two-dimensional XY model; concurrence; entropy;
D O I：
10.1016/j.physleta.2005.08.040
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The thermal entanglement in a two-dimensional Heisenberg XY Model is investigated. The concurrence C of a 2 x 2 and a 3 x 3 square lattices, respectively, is calculated. The concurrence C is decreased as the temperature T is increased. Though there is no direct interactions between two diagonal qubits, the thermal entanglement still exists. The saturation effect occurs in the entropy when the 2 x 2 square lattice is reduced and extended to a one-dimensional Heisenberg chain of large number of lattices. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：110 / 118
页数：9
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