论文标题
从原子 - 波导界面中的局部原子激发到局部原子激发的跨界
Crossover from a delocalized to localized atomic excitation in an atom-waveguide interface
论文作者
论文摘要
一个原子波导系统，它提出了一个量子接口之一，可以在光和原子之间实现强耦合，可以支持紧密限制的光模式。在这种独特的量子界面中，我们从理论上研究了在远程偶极 - 偶极相互作用和晶格疾病下从分离到局部原子激发的分频器。激发分布的两个定位长度和耗散von Neumann纠缠熵的幂律量表都显示了此交叉的签名。我们从数值上进一步计算了基本的非铁官哈密顿量的水平统计，随着无序强度的增加，差距比下降，样品内方差在达到各自的饱和值之前增加。深度局部策略中的平均差距比与泊松统计的差异和相对较大的样本内差异接近，而在非分类状态下，出现了显着的排斥。我们的结果提供了研究原子 - 波导界面中非共性现象的见解，该界面可以潜在地应用于该界面中的光子存储中。
An atom-waveguide system, which presents one of the quantum interfaces that enable strong couplings between light and atoms, can support tightly-confined guided modes of light. In this distinctive quantum interface, we theoretically investigate the crossover from a delocalized to localized atomic excitation under long-range dipole-dipole interactions and lattice disorders. Both localization lengths of the excitation distributions and power-law scalings of dissipative von Neumann entanglement entropy show signatures of this crossover. We further calculate numerically the level statistics of the underlying non-Hermitian Hamiltonian, from which as the disorder strength increases, the gap ratio decreases and the intrasample variance increases before reaching respective saturated values. The mean gap ratio in the deeply localized regime is close to the one from Poisson statistics along with a relatively large intrasample variance, whereas in the nondisordered regime, a significant level repulsion emerges. Our results provide insights to study the non-ergodic phenomenon in an atom-waveguide interface, which can be potentially applied to photon storage in this interface under dissipations.
