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arXiv · 2609.18575

Filter-Free Indistinguishable Photon Generation from Continuous-Wave-Driven Integrated Microresonators

Ruiyang Chen·Sicheng Zeng·Yuan Chen·Sanli Huang·Zeying Zhong·Zhen Chen·Xue Bai·Yi-Han Luo·Junqiu Liu
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Abstract

Quantum networks require scalable photon sources combining narrow linewidth, high efficiency, and high indistinguishability. Microresonator photon-pair sources are promising candidates, yet a source-only description based on the joint spectral amplitude (JSA) predicts near-zero Hong-Ou-Mandel (HOM) interference visibility between photons generated by independent, CW-driven microresonators. In this work, we show that the observed HOM interference is not determined by the JSA alone. By combining finite-time detection with cavity-enhanced spontaneous four-wave mixing, we characterize a detector-conditioned heralded state governed by the idler-photon detection window. We further demonstrate that independently optimizing the idler and signal detection windows allows both heralded-photon indistinguishability and intrinsic heralding efficiency to approach unity, without spectral filtering or complex source engineering. Utilizing integrated high-$Q$ silicon nitride microresonators, we achieve HOM visibilities of 0.992(8) and 0.942(12), without background subtraction, at fourfold count rates of 4.5(3) and 12.2(6) Hz, respectively. Our work establishes CW-driven high-$Q$ microresonators as a robust and scalable platform for quantum-network primitives.

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Ruiyang Chen, Sicheng Zeng, Yuan Chen, Sanli Huang, Zeying Zhong, Zhen Chen, Xue Bai, Yi-Han Luo, Junqiu Liu. 2026-09-16. Filter-Free Indistinguishable Photon Generation from Continuous-Wave-Driven Integrated Microresonators. https://arxiv.org/abs/2609.18575

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