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Related Experiment Video

Updated: Jan 11, 2026

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High-brightness photon-pair source based on high-Q multimode waveguide racetrack resonator.

Jinzhao Wang, Zheng Cao, Jiewen Li

    Optics Express
    |November 11, 2025
    PubMed
    Summary
    This summary is machine-generated.

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    We developed a high-brightness, on-chip photon-pair source using silicon resonators. This efficient source is crucial for advancing integrated quantum photonic technologies.

    Area of Science:

    • Quantum Optics
    • Integrated Photonics
    • Materials Science

    Background:

    • Efficient generation of correlated photon pairs is essential for quantum information processing.
    • Spontaneous four-wave mixing (SFWM) in silicon devices is a key method for photon-pair generation.
    • High-quality-factor (Q) resonators enhance photon-pair generation rates (PGR).

    Purpose of the Study:

    • To demonstrate a high-brightness, on-chip photon-pair source.
    • To achieve energy-efficient photon-pair generation using a high-Q racetrack resonator.
    • To establish a fabrication-friendly architecture for integrated quantum photonics.

    Main Methods:

    • Fabrication of a silicon-on-insulator (SOI) racetrack resonator with a Q factor of 1.75 × 10^5 using a single-etch process.

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  • Integration of uniform multimode waveguides and optimized Euler bends to minimize loss and dispersion.
  • Utilizing spontaneous four-wave mixing (SFWM) with a continuous-wave pump.

    • Main Results:

    • Achieved an on-chip brightness of 1.54 GHz·mW^-2·nm^-1 with a low pump power of 44.67 µW.
    • Demonstrated enhanced intracavity field and improved frequency matching for SFWM.
    • Successfully suppressed fundamental mode loss and minimized round-trip cavity dispersion.

    Conclusions:

    • The developed racetrack resonator provides a highly efficient and fabrication-friendly photon-pair source.
    • This work advances integrated quantum photonic technologies by offering a practical solution for on-chip photon generation.
    • The high brightness and efficiency pave the way for scalable quantum systems.