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Gaussian-modulated continuous-variable quantum key distribution over 60 km fiber using an integrated silicon photonic

Xuesong Xu, Lu Fan, Yan Pan

    Optics Letters
    |June 15, 2026
    PubMed
    Summary
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    This study demonstrates a 60 km quantum key distribution system using an integrated silicon photonic receiver. This breakthrough enables secure optical links for metropolitan-scale quantum networks.

    Area of Science:

    • Quantum Information Science
    • Integrated Photonics
    • Cybersecurity

    Background:

    • Continuous-variable quantum key distribution (CV-QKD) offers secure optical communication but is limited by integrated receiver performance and noise.
    • Extending the transmission distance of chip-based CV-QKD systems is crucial for practical applications.

    Purpose of the Study:

    • To demonstrate a fully integrated photonic continuous-variable quantum key distribution system with extended transmission distance.
    • To overcome limitations in integrated receiver performance and noise suppression for scalable secure optical links.

    Main Methods:

    • Development of a high-clearance, broadband silicon photonic receiver.
    • Implementation of a robust digital signal processing framework with time-domain superposition algorithm and dynamic single-tap equalization.

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  • Operation of a Gaussian-modulated continuous-variable quantum key distribution system.

    • Main Results:

    • Successful demonstration of CV-QKD over 60 km using an integrated silicon photonic receiver.
    • Achieved an asymptotic secret key rate of 1.68 Mbps and a finite-size secret key rate of 0.80 Mbps.
    • Extended chip-based CV-QKD to metropolitan-scale distances.

    Conclusions:

    • Integrated silicon photonic receivers are viable for large-scale quantum networks.
    • The demonstrated system overcomes previous distance limitations in chip-based CV-QKD.
    • This work paves the way for compact and scalable secure optical communication links.