级联量子系统中超辐射发射相关性的预测
Predicting correlations in superradiant emission from a cascaded quantum system
AI总结：
针对纳米光纤耦合冷原子系综中大型级联量子系统超辐射发射的高阶相关性预测难题，提出基于自旋截断维格纳近似的随机模拟方法，可有效计算二阶量子相干函数，为大规模级联系统分析提供可扩展方案。
摘要：
在最近的实验中，利用纳米光纤耦合的冷原子系综实现了一种新型级联量子系统。该装置使得研究多达一千个原子的高度激发集体自旋态的超辐射衰减成为可能，其特点是通过波导模式介导的单向耦合。由于大型多激发系综和原子间级联相互作用的复杂性，传统模拟方法无法预测超辐射发射的一阶以上相关性。为应对这一挑战，我们开发了一种基于自旋截断维格纳近似的新模拟技术。我们的随机模拟工具能够预测强激发级联双能级发射体系统所发射光场的二阶量子相干函数 $g^{(2)}$ 以及其他关联函数。因此，该方法为分析具有大量粒子的级联量子系统提供了一种有效且可扩展的方法。
英文摘要：
In recent experiments, a novel type of cascaded quantum system has been realized using nanofiber-coupled cold atomic ensembles. This setup has enabled the study of superradiant decay of highly excited collective spin states of up to a thousand atoms, featuring unidirectional coupling mediated by the waveguide mode. The complexity arising from the large, multi-excited ensemble and the cascaded interactions between atoms makes conventional simulation methods unsuitable for predicting the correlations of superradiant emission beyond the first order. To address this challenge, we developed a new simulation technique based on the truncated Wigner approximation for spins. Our stochastic simulation tool can predict the second-order quantum coherence function, $g^{(2)}$, along with other correlators of the light field emitted by a strongly excited cascaded system of two-level emitters. This approach thus provides an effective and scalable method for analyzing cascaded quantum systems with large numbers of particles.
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