单模真空场-耦合双原子系统的量子保真度演化  

Properties of evolution of quantum fidelity in a single-mode vacuum field coupled two-level Atoms' System

作　　者：王冬艳[1,2,3] 成彬[1,2] 杨亚辉[4] 

机构地区：[1]河北省科学院应用数学研究所,河北石家庄050081 [2]河北省信息安全认证工程技术研究中心 [3]河北华烨冀科信息技术有限责任公司,河北石家庄050081 [4]河北省机电一体化中试基地,河北石家庄050081

出　　处：《河北省科学院学报》2014年第1期8-13,共6页Journal of The Hebei Academy of Sciences

基　　金：河北省科学院重大项目(14624)

摘　　要：本文利用全量子理论,研究了单模真空场-耦合双原子系统的量子保真度演化特性。结果表明,原子与原子之间偶极相互作用的耦合系数、原子与光场之间的耦合系数以及初态时两个原子均处于基态的几率等因素影响着保真度的演化规律。当原子与原子之间偶极相互作用增大时,整个体系的保真度增大,并且演化曲线出现崩溃-回复特征;当原子和光场之间的耦合系数增大时,整个体系的保真度减小,并且演化曲线的周期明显变小;当初态两原子均处在基态的概率增大时,整个体系的保真度增大。The properties of quantum fidelity evolution in a single-mode vacuum field-coupled two-level atoms system are studied by quantum theory.The results show that the fidelities relate closely with the dipole-dipole interaction strength between the atoms,the coupling strength between the field and the atoms and the probability of the two atoms stayed simultaneously in their ground states.The fidelity of the system increase with the increase of the dipole-dipole interaction strength between the atoms,and present collapse-revert;the fidelity of the system decrease with the increase of the coupling strength between the field and the atoms and the periodicity of the fidelity becomes shorter with the stronger of the coupling;the fidelity of the system increase with the increase of the probability of the two atoms stayed simultaneously in their ground states.

关 键 词：保真度 单模真空场 耦合双原子 

分 类 号：O413[理学—理论物理]