Thermal entanglement in spin-1 biparticle system

被引：30
作者：
Zhang, GF
Li, SS
Liang, HQ
机构：
[1] Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 100083, Peoples R China
[2] Shanxi Univ, Inst Theoret Phys, Taiyuan 030006, Peoples R China
来源：
OPTICS COMMUNICATIONS | 2005年 / 245卷 / 1-6期
关键词：
thermal entanglement; negativity; quantum computing;
D O I：
10.1016/j.optcom.2004.10.045
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The thermal entanglement in a two-qubit Spin-1 system with two spins coupled by exchange interaction is investigated in terms of the measure of entanglement called "negativity". It is found that the thermal entanglement exists and is symmetric for both ferromagnetic and antiferromagnetic exchange couplings. Moreover, the critical temperature at which the negativity vanishes increases with the exchange coupling constant J. From the temperature and magnetic field dependences we demonstrate that the temperature and the magnetic field can affect the feature of the thermal entanglement significantly. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：457 / 463
页数：7
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