相移控制下XX自旋链中的量子态传递

J4 ›› 2013, Vol. 30 ›› Issue (6): 731-737.

相移控制下XX自旋链中的量子态传递

张忠军，史鹏，李文东，顾永建

中国海洋大学物理系，山东青岛 266100

出版日期:2013-11-28 发布日期:2013-11-13
通讯作者: 顾永建(1964-)，山东人，博士，教授，主要从事量子信息与计算研究。 E-mail:yjgu@ouc.edu.cn
作者简介:张忠军（1987-），山东人，研究生，主要从事量子信息与自旋链量子通信研究。Email：hdyoohoo@163.com
基金资助:
国家自然科学基金（60677044）资助项目

Quantum state transfer in XX spin chain with phase shift control

ZHANG Zhong-jun, SHI Peng, LI Wen-dong, GU Yong-jian

Department of Physics, Ocean University of China, Qingdao 266100 China

Published:2013-11-28 Online:2013-11-13

摘要/Abstract

摘要： 研究了由Aharonov-Casher相互作用产生的相移对XX自旋链中量子态传递的影响。对信道的纠缠度及传递量子态的保真度进行数值模拟后发现，控制相移的方法可以有效抵抗信道的消相干作用，显著提高自旋链中量子比特间的纠缠度及量子态的保真度。此外，量子态发送端与接收端之间相对位置的不同也会影响纠缠度和保真度的大小，在包含偶数个自旋格点的环形自旋链中，当发送端与接收端处在直径上相对的位置时，接收端的纠缠度和量子态传递的保真度可以达到最大值。

关键词: 量子光学, 量子态传递, 相移控制, 纠缠, 保真度, 自旋链

Abstract: The effect of phase shift generated by Aharonov-Casher interaction on the quantum state transfer in a XX spin chain is investigated. The concurrence of the channel and the fidelity of the state are calculated by numerical simulations. It is found that by controlling the phase shift, decoherence is suppressed, and the entanglement and fidelity can be enhanced. In addition, the relative positions between the sender and the receiver have an influence on the entanglement and fidelity. When they are located at diametrically opposite sites in an even spin ring respectively, the maximum values of entanglement and fidelity can be obtained.

Key words: quantum optics, quantum state transfer, phase shift control, entanglement, fidelity, spin chain

中图分类号:

O431.2

张忠军，史鹏，李文东，顾永建. 相移控制下XX自旋链中的量子态传递 [J]. J4, 2013, 30(6): 731-737.

ZHANG Zhong-jun, SHI Peng, LI Wen-dong, GU Yong-jian. Quantum state transfer in XX spin chain with phase shift control[J]. J4, 2013, 30(6): 731-737.

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