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Multi-rate and multi-protocol continuous-variable quantum key distribution.

Tao Wang, Yuehan Xu, Huanxi Zhao

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    This study demonstrates a flexible continuous-variable quantum key distribution (CV-QKD) system capable of multiple protocols and data rates. This breakthrough enhances interoperability for large-scale quantum networks.

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    Area of Science:

    • Quantum Information Science
    • Quantum Communication Security

    Background:

    • Quantum Key Distribution (QKD) offers secure information transmission.
    • Large-scale QKD deployment faces challenges in system interoperability and flexibility.

    Purpose of the Study:

    • To experimentally verify a versatile continuous-variable (CV) QKD system.
    • To demonstrate a single CV-QKD system's capability for multiple protocols and data rates.

    Main Methods:

    • Utilized a flexible modulator for multiple QKD protocols.
    • Employed a broadband coherent detector for variable symbol rates.
    • Experimentally validated system switching between protocols and rates.

    Main Results:

    • Successfully demonstrated a CV-QKD system supporting diverse protocols and rates.
    • Showcased the system's adaptability, akin to classical optical communication.
    • Verified the generation of secure keys across different configurations.

    Conclusions:

    • The developed CV-QKD system offers a flexible, adjustable solution for quantum networks.
    • This work addresses key interoperability challenges for practical QKD implementation.
    • Provides a system-level foundation for future flexible quantum network infrastructure.