Fully passive monolithic silicon quantum photonic circuit for entangled photon-pair generation

Abstract

Integrated quantum photonic circuits are a key enabling technology for the scalability of quantum information systems. Among the available platforms, silicon photonics offers an unrivalled capability for the large-scale integration of photonic components within compact footprints. However, the strong index contrast that enables ultra-compact silicon devices also makes them highly sensitive to fabrication imperfections. As circuit complexity increases, active tuning is generally required to maintain spectral alignment among the different components, leading to significant power consumption that ultimately limit scalability. Here, we demonstrate a fully integrated silicon quantum photon-pair source operating without active tuning of any component. The circuit combines photon-pair generation in a micro-ring resonator, pump rejection using Bragg filters, and signal/idler demultiplexing through modal add-drop filters with building blocks engineered to minimize sensitivity to fabrication variations. The resulting circuit achieves excellent experimental quantum performance.

Coincidence rates up to 4000 counts s⁻¹ with coincidence-to-accidental ratios as high as 100 are obtained across the generated spectrum, while separate two-photon interference measurements yield raw visibilities exceeding 93% for individually selected ITU wavelength-channel pairs. By eliminating the need for active spectral tuning while maintaining high quantum performance, this work addresses a major bottleneck in the scaling of complex silicon quantum photonic circuits.

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Cite

BibTeX RIS

BibTeX

@misc{medina2026fully,
  title = {{Fully passive monolithic silicon quantum photonic circuit for entangled photon-pair generation}},
  author = {David E Medina and Paul J Robin and Romain Dalidet and Sébastien Tanzilli and Anthony Martin and Ségolène Olivier and Quentin Wilmart and Laurent Vivien and Laurent Labonté and Carlos Alonso-Ramos and Eric Cassan},
  howpublished = {HAL},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.29420},
  eprint = {2609.29420},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05785146v1},
  note = {CC BY-NC-ND 4.0},
}

RIS

TY  - UNPB
TI  - Fully passive monolithic silicon quantum photonic circuit for entangled photon-pair generation
AU  - David E Medina
AU  - Paul J Robin
AU  - Romain Dalidet
AU  - Sébastien Tanzilli
AU  - Anthony Martin
AU  - Ségolène Olivier
AU  - Quentin Wilmart
AU  - Laurent Vivien
AU  - Laurent Labonté
AU  - Carlos Alonso-Ramos
AU  - Eric Cassan
PY  - 2026
DA  - 2026/09/24
PB  - HAL
DO  - 10.48550/arxiv.2609.29420
UR  - https://hal.science/hal-05785146v1
AB  - Integrated quantum photonic circuits are a key enabling technology for the scalability of quantum information systems. Among the available platforms, silicon photonics offers an unrivalled capability for the large-scale integration of photonic components within compact footprints. However, the strong index contrast that enables ultra-compact silicon devices also makes them highly sensitive to fabrication imperfections. As circuit complexity increases, active tuning is generally required to maintain spectral alignment among the different components, leading to significant power consumption that ultimately limit scalability. Here, we demonstrate a fully integrated silicon quantum photon-pair source operating without active tuning of any component. The circuit combines photon-pair generation in a micro-ring resonator, pump rejection using Bragg filters, and signal/idler demultiplexing through modal add-drop filters with building blocks engineered to minimize sensitivity to fabrication variations. The resulting circuit achieves excellent experimental quantum performance.  Coincidence rates up to 4000 counts s⁻¹ with coincidence-to-accidental ratios as high as 100 are obtained across the generated spectrum, while separate two-photon interference measurements yield raw visibilities exceeding 93% for individually selected ITU wavelength-channel pairs. By eliminating the need for active spectral tuning while maintaining high quantum performance, this work addresses a major bottleneck in the scaling of complex silicon quantum photonic circuits.
ER  -

Abstract

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