发表机构
Max Planck Institute for the Science of Light; Friedrich-Alexander-Universität Erlangen-Nürnberg（马克斯·普朗克光科学研究所; 埃尔兰根-纽伦堡大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究针对氮化硅微谐振器此前未实现频率简并双光子源的问题，通过逆四波混频在氮化硅微环谐振器中实现电信波段双光子源，还验证了其作为预告单光子源的性能，展示了该集成平台的量子光生成潜力。
AI 中文摘要
带有氮化硅（$\mathrm{Si_3N_4}$）微环谐振器的光子芯片已被广泛用作预告式单光子源，但此前尚未证实其可作为频率简并双光子源运行。本研究通过逆四波混频（FWM）过程，在$\mathrm{Si_3N_4}$环形微谐振器中实现了电信波段的双光子源，该过程中来自不同光谱泵浦的两个光子被转换为一对完全相同的双光子。测量结果显示，其最大符合偶然比（CAR）为$5.4\pm0.6$。此外，该微谐振器还可通过泵浦简并自发四波混频（SFWM）用作预告式单光子源，表现出$P=0.67\pm0.05$的光谱纯度和$g^{(2)}_h(0)=0.0042\pm0.0015$的预告反聚束效应。这些结果共同证明了在单个集成$\mathrm{Si_3N_4}$平台上可实现两种光子产生方案，凸显了其在可扩展、定制化量子光生成方面的潜力。
英文摘要
Photonic chips with silicon nitride ($\mathrm{Si_3N_4}$) microring resonators are well established as heralded single-photon sources, but their operation as frequency-degenerate twin-photon sources has not previously been demonstrated. Here, we realise a twin-photon source at telecommunication wavelengths in a $\mathrm{Si_3N_4}$ ring microresonator via an inverse four-wave mixing (FWM) process, in which two photons from spectrally distinct pumps are converted into a pair of identical twin photons. The measurements show a maximum coincidence-to-accidental ratio (CAR) of $5.4\pm0.6$. In addition, the microresonator functions as a heralded single-photon source through pump-degenerate spontaneous four-wave mixing (SFWM), exhibiting a spectral purity of $P=0.67\pm0.05$ and a heralded anti-bunching of $g^{(2)}_h(0)=0.0042\pm0.0015$. Together, these results demonstrate both photon-generation schemes on a single integrated $\mathrm{Si_3N_4}$ platform, highlighting its potential for scalable, tailored quantum light generation.
