脉冲宽度对绝热演化下制备纠缠态的影响

J4 ›› 2010, Vol. 27 ›› Issue (3): 300-307.

脉冲宽度对绝热演化下制备纠缠态的影响

涂杰¹,胡连²

1 吉林大学珠海学院广东珠海 519041; 2 华南师范大学物理与电信工程学院广东广州 510006

收稿日期:2009-11-09 修回日期:2010-01-11 出版日期:2010-05-28 发布日期:2010-05-11
通讯作者: 胡连（1952—）男，汉族，四川荣昌人，华南师范大学物理系教授，硕士生导师.
作者简介:涂杰（1982—）男，汉族，湖北洪湖人，吉林大学珠海学院公共基础中心教师。E-mail:mailonjacy@163.com
基金资助:
广东省自然科学基金资助（320352）

The effection of pulse bandwidth to preparation of entangled states by adiabatic passage

TU Jie¹, HU Lian²

1 Zhuhai College Jilin University, Zhuhai, 519041, China;
2 Dept. of Physics, South China Normal University, Guangzhou, 510006, China

Received:2009-11-09 Revised:2010-01-11 Published:2010-05-28 Online:2010-05-11

摘要/Abstract

摘要：

精确解旋转磁场作用下的两自旋1/2粒子体系，提出了脉冲宽度是影响态制备的一个非常重要的因素。从能级演化图形与几率跃迁图形上对应地进行了比较分析，脉冲宽度会决定施加点附近能级简并处的态是否发生交换; 与R.G.Unanyan的计算结果相比较，发现绝热条件是否严格满足已经不那么重要，他们给出的绝热条件不是一个很好的判据。

关键词: 量子光学∣脉冲宽度∣精确解∣绝热条件∣纠缠态

Abstract:

The exact solution of Schr?dinger equation for two spin-1/2 particles under the rotating magnetic field is obtained. Pulse bandwidth, as a crucial factor in population transfer, is proposed. We analysed the figures of energy and population, concluded that bandwidth of pulse decides if there is an exchange between states at the places of energy degeneracy. Comparing our result with R.G.Unanyan’s, it is found that whether the adiabatic condition is satisfied exactly or not is not so important, and the adiabatic condition that they derived may not be a reliable criterion for preparing entangled states.

Key words: quantum optics∣pulse bandwidth∣exact solution∣adiabatic condition∣ entangled states

涂杰胡连 . 脉冲宽度对绝热演化下制备纠缠态的影响[J]. J4, 2010, 27(3): 300-307.

TU Jie, HU Lian . The effection of pulse bandwidth to preparation of entangled states by adiabatic passage[J]. J4, 2010, 27(3): 300-307.

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