Twin-photon generation in a silicon nitride microresonator
Abstract
Photonic chips with silicon nitride (Si3N4) 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 Si3N4 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±0.6. 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±0.05 and a heralded anti-bunching of g(2)h(0)=0.0042±0.0015. Together, these results demonstrate both photon-generation schemes on a single integrated Si3N4 platform, highlighting its potential for scalable, tailored quantum light generation.
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BibTeX
@misc{pacher2026twinphoton,
title = {{Twin-photon generation in a silicon nitride microresonator}},
author = {Franz Pacher and Haochen Yan and Alekhya Ghosh and Arghadeep Pal and Toby Bi and Hao Zhang and Lixing You and Hao Li and Daniela Salvoni and Shuangyou Zhang and Pascal Del'Haye},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.04171},
eprint = {2609.04171},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.04171},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Twin-photon generation in a silicon nitride microresonator
AU - Franz Pacher
AU - Haochen Yan
AU - Alekhya Ghosh
AU - Arghadeep Pal
AU - Toby Bi
AU - Hao Zhang
AU - Lixing You
AU - Hao Li
AU - Daniela Salvoni
AU - Shuangyou Zhang
AU - Pascal Del'Haye
PY - 2026
DA - 2026/09/03
PB - arXiv
DO - 10.48550/arxiv.2609.04171
UR - https://arxiv.org/abs/2609.04171
AB - Photonic chips with silicon nitride (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 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±0.6. 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±0.05 and a heralded anti-bunching of g^(2)_h(0)=0.0042±0.0015. Together, these results demonstrate both photon-generation schemes on a single integrated Si_3N_4 platform, highlighting its potential for scalable, tailored quantum light generation.
ER -