Filter-Free Indistinguishable Photon Generation from Continuous-Wave-Driven Integrated Microresonators
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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BibTeX
@misc{chen2026filterfree,
title = {{Filter-Free Indistinguishable Photon Generation from Continuous-Wave-Driven Integrated Microresonators}},
author = {Ruiyang Chen and Sicheng Zeng and Yuan Chen and Sanli Huang and Zeying Zhong and Zhen Chen and Xue Bai and Yi-Han Luo and Junqiu Liu},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.18575},
eprint = {2609.18575},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.18575},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Filter-Free Indistinguishable Photon Generation from Continuous-Wave-Driven Integrated Microresonators
AU - Ruiyang Chen
AU - Sicheng Zeng
AU - Yuan Chen
AU - Sanli Huang
AU - Zeying Zhong
AU - Zhen Chen
AU - Xue Bai
AU - Yi-Han Luo
AU - Junqiu Liu
PY - 2026
DA - 2026/09/16
PB - arXiv
DO - 10.48550/arxiv.2609.18575
UR - https://arxiv.org/abs/2609.18575
AB - 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.
ER -