旋波近似下的量子Zeno效应时间  

Study on Quantum Zeno Effect Time with Rotating-wave Approximation

作　　者：李兴敏[1] 宋立军[2] 

机构地区：[1]长春理工大学理学院,长春130022 [2]长春大学理学院,长春130022

出　　处：《长春大学学报》2012年第8期960-962,985,共4页Journal of Changchun University

基　　金：教育部科学技术研究重点项目(211040);吉林省自然科学基金项目(20101514);吉林省青年基金项目(201201140);吉林省教育厅科学技术研究基金项目(2012245)

摘　　要：频繁对系统进行量子测量会产生阻抑不稳定量子态衰减的量子Zeno效应。通过对哈密顿量以及不稳定量子态进行中岛变换,在薛定谔绘景下直接计算出量子Zeno效应时间,得出弱耦合情况下发生量子Zeno效应所需的最基本条件,给出量子Zeno效应时间与测量光场频率、耦合强度及不稳定量子态自身能级间隔之间的关系。The unstable quantum states can be prevented from decay when measurements are frequently applied to the system, which is called quantum Zeno effect. Through Nakajima transformation on Hamiltonian and unstable quantum states, this article presents a method to compute the quantum Zeno effect time in Schrodinger picture, gets the basic condition of quantum Zeno effect in weak coupling and gives the relations between quantum Zeno effect time and the frequency of measuring optical field, the coupling strength and the energy-level spacing.

关 键 词：量子Zeno效应 中岛变换 旋波近似 

分 类 号：O431.2[机械工程—光学工程]