V型三能级原子双模光场系统中的量子特性  

Quantum Properties in a System of Two-Mode Field Interacting with a V-Type Three-Level Atom

作　　者：丛红璐 王林杰 任学藻[2] CONG Hong-lu;WANG Linjie;REN Xue-zao(College of General Education,Cangzhou Jiaotong University,Huanghua 061199,China;School of Science,Southwest Universiry of Science and Technology,Mianyang 621010,China)

机构地区：[1]沧州交通学院通识教育学院,河北黄骅061199 [2]西南科技大学理学院,四川绵阳621010

出　　处：《量子光学学报》2021年第1期54-61,共8页Journal of Quantum Optics

基　　金：国家自然科学基金(11804136);河北省高等学校科学技术研究科技指导项目(Z2020109);河北省高等学教育教学改革与实践项目(2018GJJG649);北京交通大学海滨学院教学改革与实践项目(HBJY19018)。

摘　　要：研究了双模相干态光场与V型原子相互作用的量子系统,并在非旋波近似下对量子系统的布居概率和量子纠缠进行了精确求解。讨论了平均光子数n以及原子初始状态能级叠加对布局概率和量子纠缠的影响,分析了非旋波项跃迁对量子系统动力学特点产生影响的原因。结果表明:随着n的增大布居概率和量子纠缠演化周期逐渐增大。布居概率塌缩区对应系统纠缠度较小,布居概率回复区对应系统纠缠度较大。原子处于叠加态时,量子纠缠初始值和平均值会降低。非旋波项的跃迁使布居概率和纠缠演化曲线出现锯齿状振荡。A quantum system for the interaction of a two-mode coherent state field with V-type atom have been studied.The population and quantum entanglement of quantum systems were solved accurately without rotating-wave approximation.The effects of average photon number ■ and atomic level superposition on the population and quantum entanglement were discussed,and the reasons of the non-rotational-wave terms transition affecting the dynamics of quantum systems were analyzed.The results show that the population and quantum entanglement evolution period increase with the increase of ■.The entanglement degree of the quantum system is smaller in the population collapse region and larger in the population recovery region.The initial value of quantum entanglement and the mean value decreases when the atom is in the superposition state at the initial time.The non-rotating-wave terms transition leads to a zigzag oscillation in the population and entanglement evolution curves.

关 键 词：布居概率 量子纠缠 双模光场 V型原子 

分 类 号：O413.2[理学—理论物理]