Van der Waals engineering serves as a powerful tool to tailor material properties and design excitonic devices. Here we report quantum-entangled photon pair generation through van der Waals engineering with two-dimensional materials. We align two van der Waals thin layers perpendicular to each other, yielding polarization-entangled photon pairs through the interference of biphoton emission in the two flakes. The polarization-entangled state is measured with a fidelity up to 86 ± 0.7%. The compatibility of van der Waals engineering with on-chip photonics opens new possibilities for entangled photon source integration at the subwavelength scale.

中文翻译：

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用于量子纠缠光子生成的范德华工程

范德华工程是定制材料特性和设计激子器件的强大工具。在这里，我们报道了通过二维材料的范德华工程产生量子纠缠光子对。我们将两个相互垂直的范德华薄层对齐，通过两个薄片中双光子发射的干涉产生偏振纠缠光子对。偏振纠缠态的测量保真度高达 86 ± 0.7%。范德华工程与片上光子学的兼容性为亚波长尺度的纠缠光子源集成开辟了新的可能性。