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首页> 外文期刊>Laser Physics: An International Journal devoted to Theoretical and Experimental Laser Research and Application >Entanglement analysis of a two-atom nonlinear Jaynes-Cummings model with nondegenerate two-photon transition, Kerr nonlinearity, and two-mode Stark shift
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Entanglement analysis of a two-atom nonlinear Jaynes-Cummings model with nondegenerate two-photon transition, Kerr nonlinearity, and two-mode Stark shift

机译：具有非简并两光子跃迁，Kerr非线性和双模斯塔克频移的双原子非线性Jaynes-Cummings模型的纠缠分析

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摘要

An entangled state, as an essential tool in quantum information processing, may be generated through the interaction between light and matter in cavity quantum electrodynamics. In this paper, we study the interaction between two two-level atoms and a two-mode field in an optical cavity enclosed by a medium with Kerr nonlinearity in the presence of a detuning parameter and Stark effect. It is assumed that the atom-field coupling and third-order susceptibility of the Kerr medium depend on the intensity of the light. In order to investigate the dynamics of the introduced system, we obtain the exact analytical form of the state vector of the considered atom-field system under initial conditions which may be prepared for the atoms (in a coherent superposition of their ground and upper states) and the fields (in a standard coherent state). Then, in order to evaluate the degree of entanglement between the subsystems, we investigate the dynamics of the entanglement by employing the entanglement of formation. Finally, we analyze in detail the influences of the Stark shift, the deformed Kerr medium, the intensity-dependent coupling, and also the detuning parameter on the behavior of this measure for different subsystems. The numerical results show that the amount of entanglement between the different subsystems can be controlled by choosing the evolved parameters appropriately.
机译：纠缠态是量子信息处理中必不可少的工具，它可以通过腔量子电动力学中的光与物质之间的相互作用来生成。在本文中，我们研究了在存在失谐参数和斯塔克效应的情况下，被Kerr非线性介质包围的光腔中两个二级原子与一个双模场之间的相互作用。假设Kerr介质的原子场耦合和三阶磁化率取决于光的强度。为了研究引入系统的动力学，我们获得了可能为原子准备的初始条件下所考虑的原子-场系统的状态向量的精确解析形式（其基态和上态的相干叠加）和字段（处于标准相干状态）。然后，为了评估子系统之间的纠缠程度，我们通过利用地层纠缠来研究纠缠的动力学。最后，我们详细分析了Stark位移，变形的Kerr介质，依赖强度的耦合以及失谐参数对不同子系统的此行为的影响。数值结果表明，可以通过适当选择演化参数来控制不同子系统之间的纠缠量。

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