不同方向非均匀磁场对Heisenberg XYZ 链中热纠缠的影响

J4 ›› 2012, Vol. 29 ›› Issue (4): 434-440.

不同方向非均匀磁场对Heisenberg XYZ 链中热纠缠的影响

秦猛，李延标，白忠

解放军理工大学理学院，江苏南京 211101

收稿日期:2011-07-04 修回日期:2011-09-16 出版日期:2012-07-28 发布日期:2012-07-01
通讯作者: 秦猛（1981-）山东枣庄人，讲师，从事量子关联，量子保密通信的研究。 E-mail:qrainm@gmail.com
基金资助:
解放军理工大学预研基金资助课题(20110515，20110101)，解放军理工大学理学院青年基金资助课题(QN-SL-2010-01)

Effect of different inhomogeneous magnetic fields on thermal entanglement in a two-qutrit Heisenberg XYZ chain

QIN Meng, LI Yan-Biao, BAI Zhong

Institute of Science, PLA University of Science and Technology, Nanjing, 211101, China

Received:2011-07-04 Revised:2011-09-16 Published:2012-07-28 Online:2012-07-01

摘要/Abstract

摘要：

采用纠缠度量方法Negativity研究了包含不同方向非均匀磁场自旋为1的两粒子Heisenberg XYZ 链的量子纠缠特性。研究发现，系统处于基态时有量子相变发生，铁磁和反铁磁情形下纠缠的表现行为完全不同，故可以利用这种性质来生成所需纠缠。研究还发现纠缠伴随非均匀磁场的变化有震荡现象，并且x方向和y方向的纠缠存在先消失后复苏现象。纠缠随系统其他参数的变化会因磁场方向的不同而有完全不一样的特征，从而可以通过调节磁场方向、各向异性参数等来提高纠缠值和扩大纠缠范围。

关键词: 量子光学, 负值度, 自旋1粒子, 不同方向非均匀磁场

Abstract:

The quantum entanglement of two-qutrit Heisenberg XYZ chains interacting with different inhomogeneous magnetic fields is investigated by means of negativity. It is found that the quantum phase transition occurs when the system is in the ground state. The behaviors of entanglement in ferromagnetic and anti-ferromagnetic are totally different. So, we can produce entanglement by this feature. We also find that the entanglement behaves oscillator when the external magnetic field becomes inhomogeneous. And the x/y component magnetic fields can induce the entanglement to disappear and then to revive. The dependence of the entanglement on parameters is different with different magnetic field. The entanglement can be controlled by varying the directions of external magnetic field and the anisotropy couplings Jz.

Key words: quantum optics, negativity, qutrit, different inhomogeneous magnetic fields

中图分类号:

秦猛，李延标，白忠. 不同方向非均匀磁场对Heisenberg XYZ 链中热纠缠的影响[J]. J4, 2012, 29(4): 434-440.

QIN Meng, LI Yan-Biao, BAI Zhong. Effect of different inhomogeneous magnetic fields on thermal entanglement in a two-qutrit Heisenberg XYZ chain[J]. J4, 2012, 29(4): 434-440.

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