The interplay of topology and optics provides a route to pursue robust photonic devices, with the application to photonic quantum computation in its infancy. However, the possibilities of harnessing topological structures to process quantum information with linear optics, through the quantum interference of photons, remain largely uncharted. Here, we present a Hong-Ou-Mandel interference effect of topological origin. We show that this interference of photon pairs—ranging from constructive to destructive—is solely determined by a synthetic magnetic flux, rendering it resilient to errors on a fundamental level. Our implementation establishes a quantized flux that facilitates exclusively destructive quantum interference. Our findings pave the way toward the development of next-generation photonic quantum circuitry and scalable quantum computing protected by virtue of topologically robust quantum gates.

中文翻译：

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拓扑红欧曼德尔干涉


拓扑和光学的相互作用为追求鲁棒的光子器件提供了一条途径，其在光子量子计算中的应用还处于起步阶段。然而，通过光子的量子干涉，利用拓扑结构通过线性光学处理量子信息的可能性在很大程度上仍然未知。在这里，我们提出了拓扑起源的红欧曼德尔干涉效应。我们证明，光子对的这种干涉（从相长到破坏性）完全由合成磁通量决定，使其在基本层面上能够抵抗错误。我们的实现建立了一种量化通量，有利于专门破坏性的量子干涉。我们的研究结果为下一代光子量子电路和受拓扑鲁棒量子门保护的可扩展量子计算的发展铺平了道路。