Dynamics of interacting Dicke model in a coupled-cavity array
Dynamics of interacting Dicke model in a coupled-cavity array
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DOI：
10.1103/physreva.90.033813
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发表时间：
2014-09-09
影响因子：
2.9
通讯作者：
Paternostro, Mauro
中科院分区：
文献类型：
--
作者：
Badshah, Fazal;Qamar, Shahid;Paternostro, Mauro
我们考虑一个相互作用的腔阵列的动力学，每个腔包含一个系综的N个二能级原子。通过探索各种尺寸的合奏和一系列的原子光和光子跳跃值提供的可能性，我们调查的多位纠缠的产生，以及整个阵列的激发转移的性能，导致现场之间的竞争的非线性的物质-光相互作用和站点间的光子跳跃。特别地，对于三腔相互作用系统，我们观察到第一腔中的初始激发通过相邻腔之间光子的跳跃完全转移到第三腔中的系综。腔模和系综的激发转移的概率分别表现出由耦合和跳跃参数控制的快振荡和慢振荡的特性。在大跳跃的情况下，通过在阵列中心的腔中注入初始激发，根据相互作用时间，可以获得三分W态以及二分最大纠缠态。腔中的系综的布居对系综与其局部腔模之间的激发转移速率有积极的影响。特别是，对于五到七个原子的合奏，三重W态可以产生，即使当跳跃率是可比的腔原子耦合率。对于具有两个初始激发的四耦合腔系统，也观察到类似的激发转移行为。
We consider the dynamics of an array of mutually interacting cavities, each containing an ensemble of N two-level atoms. By exploring the possibilities offered by ensembles of various dimensions and a range of atom-light and photon-hopping values, we investigate the generation of multisite entanglement, as well as the performance of excitation transfer across the array, resulting from the competition between on-site nonlinearities of the matter-light interaction and intersite photon hopping. In particular, for a three-cavity interacting system it is observed that the initial excitation in the first cavity completely transfers to the ensemble in the third cavity through the hopping of photons between the adjacent cavities. Probabilities of the transfer of excitation of the cavity modes and ensembles exhibit characteristics of fast and slow oscillations governed by coupling and hopping parameters, respectively. In the large-hopping case, by seeding an initial excitation in the cavity at the center of the array, a tripartite W state, as well as a bipartite maximally entangled state, is obtained, depending on the interaction time. Population of the ensemble in a cavity has a positive impact on the rate of excitation transfer between the ensembles and their local cavity modes. In particular, for ensembles of five to seven atoms, tripartite W states can be produced even when the hopping rate is comparable to the cavity-atom coupling rate. A similar behavior of the transfer of excitation is observed for a four-coupled-cavity system with two initial excitations.