含高阶项Trapped离子振动态的崩塌-回复特性

Quantum coherence in the vibration state of a trapped ion

解析分析了“捕陷”离子在驻波光场作用下的动力学。离子的量子平均能量随时间的变化呈现崩塌 -回复的特征 ,表明这个系统的振动态具有压缩效应。哈密顿量中的高阶项使得离子平均能量呈现不规则的崩塌 -回复 ,严重抑制离子的振动态的相干性。

In this paper the dynamics of the two level trapped ion which acts with standing light field is investigated analytically. Evolution of the quantum mean energy of the ion with time displays the characteristic of collapse revival which implies the vibration states of the system have squeezing effect. The collapse revival of the quantum mean energy of the ion will become irregular because of the higher term in Hamiltonian of the system. The higher term will suppress coherence of the vibration state of the ion.