Twin-photon generation in a silicon nitride microresonator
- URL: http://arxiv.org/abs/2609.04171v1
- Date: Thu, 03 Sep 2026 17:54:38 GMT
- Title: Twin-photon generation in a silicon nitride microresonator
- Abstract summary: Photonic chips with silicon nitride ($mathrmSi_3N_4$) microring resonators are well established as heralded single-photon sources, but their operation as frequency-degenerate twin-photon sources has not previously been demonstrated.<n>Here, we realise a twin-photon source at telecommunication wavelengths in a $mathrmSi_3N_4$ ring microresonator via an inverse four-wave mixing (FWM) process.
- Score: 5.780138363409542
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: 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.
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