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arXiv 2601.04440quant-ph
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一种宽带纳米线量子点腔体设计用于高效提取纠缠光子

A Broadband Nanowire Quantum Dot Cavity Design for the Efficient Extraction of Entangled Photons

University of Waterloo(滑铁卢大学);Simon Fraser University(西蒙菲莎大学)

Sayan Gangopadhyay, Sasan V. Grayli, Sathursan Kokilathasan, Michael E. Reimer

AI总结:

本文提出一种宽带纳米线量子点腔体设计,通过强耦合实现高Purcell增强,提升纠缠光子提取效率和单光子分辨性,为量子网络应用提供新途径。

摘要:

量子网络需要一种明亮的、按需生成的纠缠光子源。单个量子点位于选定的纳米线波导中,是实现此类源的有希望的候选者。然而,此类源与单光子分辨性差有关,限制了其在量子网络中的应用。增强量子点基纠缠光子源中单光子分辨性的常见方法是实现宽带光学谐振腔。在保持纳米线的优势,如方向发射、宽操作带宽和高光提取效率的同时,实现高Purcell谐振腔一直是重大挑战。在这里,我们提出了一种基于由两种共振光学模式强耦合形成的准束缚态在连续体中的纳米线谐振腔。我们数值预测这种设计支持一个具有4 nm带宽和约17倍Purcell增强的谐振腔模式。该谐振腔模式使远场发射轮廓(与高斯函数有88%重叠)具有约74%的光提取效率。我们的解决方案为生成具有增强提取效率和单光子分辨性的纠缠光子对提供了新途径,为量子网络的实际实现铺平了道路。

英文摘要:

A bright source of on-demand entangled photons is needed for quantum networks. A single quantum dot in a site-selected nanowire waveguide is a promising candidate for realizing such sources. However, such sources are associated with poor single-photon indistinguishability, limiting their applicability in quantum networks. A common approach for enhancing the single-photon indistinguishability in quantum dot-based entangled photon sources is to implement a broadband optical cavity. Achieving a high-Purcell cavity while retaining the advantages of the nanowire, such as directional emission, a broad operational bandwidth, and high light extraction efficiency, has been a significant challenge. Here, we propose a nanowire cavity based on quasi-bound states in the continuum formed by the strong coupling of two resonant optical modes. We numerically predict this design to support a cavity mode with 4 nm bandwidth and a Purcell enhancement of $\sim$17. This cavity mode enables a directional far-field emission profile (88% overlap with a Gaussian) with a light extraction efficiency of $\sim$74%. Our solution opens up a route for generating entangled photon pairs with enhanced extraction efficiency and single-photon indistinguishability for the practical realization of quantum networks.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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