内禀退相干条件下非线性相互作用对量子纠缠和保真度的影响

J4 ›› 2016, Vol. 33 ›› Issue (5): 561-565.

内禀退相干条件下非线性相互作用对量子纠缠和保真度的影响

王晓,秦猛

解放军理工大学理学院，江苏，南京，211101

收稿日期:2015-04-29 修回日期:2015-07-01 出版日期:2016-09-28 发布日期:2016-09-28
通讯作者: 王晓（1964—），江苏人，男，硕士，教授，从事量子通信和量子信息的研究。 E-mail:jfjlgdxwx@163.com
基金资助:
解放军理工大学预研基金

Influence of nonlinear interaction on the quantum entanglement and fidelity under intrinsic decoherence

WANG Xiao, QIN Meng

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

Received:2015-04-29 Revised:2015-07-01 Published:2016-09-28 Online:2016-09-28

摘要/Abstract

摘要： 通过求解Milburn 方程，研究了包含非线性相互作用的Heisenberg自旋链模型中量子纠缠和平均保真度的动力学特性，讨论了非线性相互作用和不同的初始态对量子纠缠以及平均保真度退相干的影响。研究发现，系统处于铁磁或者反铁磁的不同会导致量子纠缠随非线性相互作用的变化有极大的差异，相互作用处于铁磁情形时的纠缠变化比反铁磁时的纠缠变化更明显。研究还发现, 不同的初始态对应不同的平均保真度表现，初始态的选择会影响到系统的量子通信特性。

关键词: 量子光学；纠缠；非线性作用；内禀退相干

Abstract: Using the Milburn equation, we have studied the properties of the entanglement and fidelity dynamics in a Heisenberg spin model with nonlinear coupling. The effects of nonlinear coupling and the initial states on the quantum entanglement and the average fidelity are discussed. Results show that the conditions for system in ferromagnetic or antiferromagnetic will have significant impact on the result of entanglement versus nonlinear coupling. Moreover, we find that the behavior of average fidelity is affected by the initial state, so the initial state is one of the significant factors to determine what kinds of system are suitable as quantum channel.

Key words: quantum optics; entanglement; nonlinear coupling; intrinsic decoherence

中图分类号:

O413.1

王晓秦猛. 内禀退相干条件下非线性相互作用对量子纠缠和保真度的影响[J]. J4, 2016, 33(5): 561-565.

WANG Xiao, QIN Meng. Influence of nonlinear interaction on the quantum entanglement and fidelity under intrinsic decoherence[J]. J4, 2016, 33(5): 561-565.

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