系统动力学演化中量子加速的研究  

Quantum speedup in dynamics evolution of system

作　　者：闫丽 YAN Li(Department of Physics and Electronic Engineering,Heze University,Heze 274015,China)

机构地区：[1]菏泽学院物理与电子工程学院,山东菏泽274015

出　　处：《量子电子学报》2021年第3期327-331,共5页Chinese Journal of Quantum Electronics

基　　金：菏泽学院科研基金项目,XY18KJ10;山东省高校科研项目,J18KA224。

摘　　要：在一个二能级原子与单模腔场相互作用的系统中,基于归一化条件获得原子的密度矩阵及原子处于激发态的布居数,给出了系统演化的量子加速公式。采用纵向加速和横向加速来描述系统动力学演化的过程,利用数值计算的方法讨论了原子与腔场的耦合强度和演化时间对系统演化加速的影响。研究结果表明腔与原子的耦合能够加速量子态的纵向演化;随着演化时间的增加,量子态的横向加速增强,并伴随着周期性振荡。In the system composed of a two-level atom with a single-mode cavity,the density matrix and population of the atom in the excited state are obtained under the condition of normalization,and the quantum speedup formula of the system evolution is given.Longitudinal speedup and transverse speedup are used to describe the dynamics evolution process of the system,and influence of the coupling strength between the atom and cavity as well as the evolution time on the speedup of system evolution are analyzed numerically.Results show that the coupling between the atom and the cavity can speed up the longitudinal evolution of quantum state,and with the increase of evolution time,the transverse speedup of quantum state increases along with periodic oscillation.

关 键 词：量子光学 动力学演化 量子加速 量子速度极限时间 

分 类 号：O431.2[机械工程—光学工程]