驻波激光场中囚禁离子的线性熵和量子态转移研究

Study on the linear entropy and quantum state transfer of trapped ions in a standing wave laser field

运用量子纠缠和线性熵理论,研究了驻波激光场中囚禁离子的线性熵和量子态转移.讨论了相干角、离子的相对位相、离子与驻波激光场之间的耦合强度以及失谐量、Lamb-Dicke参数对离子线性熵的影响.结果表明,在一定的条件下可以实现囚禁离子的内态到振动态的相干转移,线性熵随时间的演化呈现非周期性的振荡行为.离子线性熵的最大值随着相干角、离子与激光场之间的耦合强度以及失谐量的增大而减小,随着Lamb-Dicke参数的增大而增大.并且可以通过调节驻波激光场来调节离子与驻波激光场之间的耦合强度和失谐量,从而达到对离子线性熵的控制与操纵,理论上提供了一种调控纠缠的方式.

Using quantum entanglement and linear entropy theory,the linear entropy and quantum state transfer of trapped ions in a standing wave laser field is studied. The effect of coherent angle,relative phase of ion,the coupling intensity and the detuning between the ion and the standing wave,Lamb-Dicke parameters on the linear entropy of the ion are discussed. The results show that the internal states of trapped ions can be transferred to the vibration state under certain conditions,the time evolution of linear entropy is a non periodic oscillatory behavior. The maximum value of the ion linear entropy decreases with the increase of the coupling strength and detuning,and increases with the increase of the Lamb-Dicke parameter. And by adjusting laser standing wave field to regulate the coupling intensity and the detuning between the ion and the standing wave,so as to achieve the linear entropy of the ion manipulation and control,theory provides a way of linear entropy of ion regulation.