电磁诱导光透明过程中两原子的自旋极化特性  

Spin polarization of twoatoms of the system with the electromagnetically induced transparency

作　　者：李敏[1] 郑丽[2] 付静[3] 

机构地区：[1]集美大学诚毅学院 [2]大连工业大学信息科学与工程学院 [3]吉林建筑大学城建学院

出　　处：《原子与分子物理学报》2015年第5期848-852,共5页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(116034);福建省中青年教师教育科研项目(JB14219)

摘　　要：本文研究了电磁诱导光透明过程中两原子的自旋极化矢量.对于数态探测场,在光信息转移过程中,两原子自旋极化矢量始终固定在z方向,大小变化非常明显,两原子一般处于混合态;对于相干态探测场,自旋极化矢量大小变化很微弱,两量子比特基本处于纯态,这有利于改善系综内原子之间的相干性,但自旋极化矢量的方向在x-z平面内.We investigate spin polarization of two atoms in process of information transfer between probe field and atomic ensemble in the electromagnetically induced transparency. For the number state of the probe light, the mean spin of two atoms is always in the z direction, and as the strength of the driving field increases, it changes obviously. However, for the coherent state of the probe light, the mean spin changes weakly in the x -z plane. Due to the coherent state, the two atoms stay in the pure state almost, and the coherent between the atoms can be improved obviously.

关 键 词：电磁诱导光透明 自旋极化矢量 平均自旋 相干性 

分 类 号：O431.2[机械工程—光学工程]