标题： 按需不可区分单光子从基于里德堡系综的高效纯光源 显示英文标题

标题： On-demand indistinguishable single photons from an efficient and pure source based on a Rydberg ensemble

摘要： 与原子系统耦合的单光子已被证明是开发量子技术的有前途的平台。 然而，目前尚缺乏与原子平台兼容的明亮、按需产生、高纯度和高不可区分性的单光子源。 在本工作中，我们展示了一种基于强相互作用里德伯系统的源。 在受阻的里德伯系综中的大光学非线性将相干光转换为单集体激发，可以作为量子场相干地检索。 我们观察到单横向模效率高达0.18(2)，$g^{(2)}=2.0(1.5)\times10^{-4}$，以及不可区分性为0.982(7)，使该系统在可扩展的量子信息应用中具有前景。 考虑到损耗，我们推断生成概率高达0.40(4)。 此外，我们研究了污染物里德伯激发对源效率的影响。 最后，我们引入了用于评估按需单光子源性能的指标。 显示英文摘要

摘要： Single photons coupled to atomic systems have shown to be a promising platform for developing quantum technologies. Yet a bright on-demand, highly pure and highly indistinguishable single-photon source compatible with atomic platforms is lacking. In this work, we demonstrate such a source based on a strongly interacting Rydberg system. The large optical nonlinearities in a blockaded Rydberg ensemble convert coherent light into a single-collective excitation that can be coherently retrieved as a quantum field. We observe a single-transverse-mode efficiency up to 0.18(2), $g^{(2)}=2.0(1.5)\times10^{-4}$, and indistinguishability of 0.982(7), making this system promising for scalable quantum information applications. Accounting for losses, we infer a generation probability up to 0.40(4). Furthermore, we investigate the effects of contaminant Rydberg excitations on the source efficiency. Finally, we introduce metrics to benchmark the performance of on-demand single-photon sources.