原子纠缠态向光场纠缠态交换传递过程的保真度

The fidelity in the process of transmitting atomic entanglement states into light-field entanglement states

目的探究原子与光场相互作用系统保真度的演化特性。方法利用全量子理论,建立由多个"原子-腔场相互作用"构成的联合物理模型,研究光场与原子的相互作用过程中原子的量子信息保真度,讨论纠缠原子态保真度的影响因素。结果原子保真度呈现周期性演化,且随着初始光场的光子数、光场与原子耦合强度的增加,原子保真度振荡的周期越来越短,说明量子纠缠信息在原子与光场之间越来越频繁的交换传递。结论适当控制相互作用时间、选取系统初态,可获得量子信息的高保真度输出。

Aim To research the time evolution properties of the system fidelity of interactoin of the atoms with the cavity fields.Methods The full quantum theory is applied to establish an united physical model which consists of the multi-atom and multi-cavity field.The quantum information fidelity in the process of the interaction of atoms with light-fields is studied.The influencing factor to fidelity of the entangled atomic states is investigated.Results The fidelity of atomic fidelity evolves periodically.With the increase of the initial photons in light-field or the coupled degree between the atoms and light-field,the oscillating cycle of atomic fidelity becomes shorter and shorter.It is shown that the shorter the cycle,the more exchanging quantum information frequently between the atoms and light-fields.Conclusion Controlling the interaction time properly and choosing a suitable initial state of the systems can get a high fidelity output.