Yurke-like态的自旋压缩

J4 ›› 2013, Vol. 30 ›› Issue (3): 314-317.

Yurke-like态的自旋压缩

易洪刚¹,陈荣华¹,李嵩松²

江西教育学院物理系，江西南昌 330032

收稿日期:2012-05-03 修回日期:2012-07-12 出版日期:2013-05-28 发布日期:2013-05-06
通讯作者: 易洪刚（1962—），江西南昌人，主要从事电子信息和量子信息研究。 E-mail:mphysics@163.com
基金资助:
江西省教育厅教改课题资助（JXJG-06-67-12），江西教育学院博士基金资助

Spin squeezing of Yurke-like state

YI Hong-gang，CHEN Rong-hua，LI Song-song

Department of Physics, Jiangxi Institute of Education, Nanchang 330032， China

Received:2012-05-03 Revised:2012-07-12 Published:2013-05-28 Online:2013-05-06

摘要/Abstract

摘要： 利用自旋压缩研究了Yurke-like态的纠缠特性。由于Yurke-like态可以看成是一个对称量子态和两个特殊多粒子态的相干叠加，因此可以通过研究叠加系数和相对相位对自旋压缩参数的影响来研究Yurke-like态的纠缠特性；利用求极值的办法得到了最佳压缩方向角和最佳压缩值的解析表达式。结果表明：自旋压缩参数随叠加系数单调变化而随相对相位作周期性改变；粒子数越多，压缩程度越高。

关键词: 量子光学, 自旋压缩, Yurke-like态, 最优压缩方向

Abstract: The entangled property of Yurke-like state was investigated via spin squeezing. Since the state is superposed by a symmetric state and two special multi-particle states, the entangled property can be studied by investigating superposition coefficient and relative phase’s influence on spin squeezing parameter; the analytical results for the optimal squeezed direction and the optimal squeezing were obtained via minimizing. Its shown that the spin squeezing parameter monotonously changes with superposition coefficients and periodically changes with relative phase. Its also shown that the more the number of the particles is, the stronger the degree of squeezing will be.

Key words: quantum optics, spin squeezing, Yurke-like state, optimal squeezed direction

中图分类号:

O431.2

易洪刚陈荣华李嵩松. Yurke-like态的自旋压缩[J]. J4, 2013, 30(3): 314-317.

YI Hong-gang，CHEN Rong-hua，LI Song-song. Spin squeezing of Yurke-like state[J]. J4, 2013, 30(3): 314-317.

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