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Related Experiment Video

Updated: Jul 4, 2025

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Radiation effect on silicon photonics chips for space quantum key distribution.

Zhao-Yuan Chen, Yan-Fei Liu, Cheng Chen

    Optics Express
    |February 1, 2024
    PubMed
    Summary

    Photonics integrated chips for quantum communication satellites show resilience to space radiation. Radiation exposure slightly reduced insertion loss, proving their feasibility for quantum networks.

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    Area of Science:

    • Quantum communication
    • Satellite technology
    • Integrated photonics

    Background:

    • Quantum communication satellites are crucial for future quantum networks.
    • Photonics integrated chips are ideal for satellite deployment due to size and weight.
    • Space radiation poses a significant risk to the performance and longevity of these chips.

    Purpose of the Study:

    • To assess the impact of space radiation on quantum key distribution transmitter chips.
    • To evaluate the radiation hardness of photonics integrated circuits for space applications.

    Main Methods:

    • Conducted gamma ray irradiation experiments on quantum key distribution transmitter chips.
    • Performed high-energy proton radiation experiments on the same chips.
    • Measured key performance parameters including insertion loss, half-wave voltage, extinction ratio, and polarization angle.

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    Last Updated: Jul 4, 2025

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    Main Results:

    • Gamma ray irradiation (100 krad (Si)) slightly reduced chip insertion loss by ~1.5 dB.
    • Proton radiation (2.39 × 10^11/cm^2) further decreased insertion loss by 0.5–1 dB.
    • Half-wave voltages, extinction ratios, and polarization angles remained largely unaffected within measurement error.

    Conclusions:

    • Photonics integrated chips demonstrate sufficient radiation tolerance for deployment in space.
    • These findings support the feasibility of building quantum constellations using photonics-based terminals.
    • The study validates the use of integrated photonics in harsh space environments for quantum communication.