发表机构
University of Science and Technology of China; Hefei National Laboratory; International Quantum Academy; Shenzhen Futian SUSTech Institute for Quantum Technology and Engineering; Southern University of Science and Technology（中国科学技术大学; 合肥国家实验室; 国际量子科学院; 深圳福田南方科技大学量子技术与工程研究所; 南方科技大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过优化探测窗口，无需滤波即可使连续波驱动微谐振器产生的光子不可区分性接近1，实现高HOM可见度，为量子网络提供可扩展光源。
AI 中文摘要
量子网络需要可扩展的光子源，其兼具窄线宽、高效率和不可区分性。微谐振器光子对源是有前景的候选方案，然而，基于联合频谱幅度（JSA）的仅源描述预测，由独立的连续波（CW）驱动的微谐振器产生的光子之间的Hong-Ou-Mandel（HOM）干涉可见度接近零。在本工作中，我们表明观测到的HOM干涉并非仅由JSA决定。通过将有限时间探测与腔增强自发四波混频相结合，我们表征了一个由闲频光子探测窗口决定的探测器条件化 heralded 态。我们进一步证明，独立优化闲频和信号探测窗口可使 heralded 光子不可区分性和固有 heralding 效率均接近1，无需频谱滤波或复杂的源工程。利用集成高Q值氮化硅微谐振器，我们在四重计数率分别为4.5(3)和12.2(6) Hz时，无需背景扣除，实现了0.992(8)和0.942(12)的HOM可见度。我们的工作确立了CW驱动的高Q值微谐振器作为量子网络原语的稳健且可扩展的平台。
英文摘要
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.
