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    We developed a quantum secret sharing protocol that overcomes distance limitations for secure communication. This breakthrough significantly boosts secure key rates over long fiber optic cables.

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    Area of Science:

    • Quantum Information Science
    • Quantum Communication Security

    Background:

    • Quantum secret sharing (QSS) is crucial for future quantum internet infrastructure.
    • Existing QSS protocols face a linear rate-distance limitation, restricting performance.

    Purpose of the Study:

    • To present a practical QSS protocol that surpasses the linear rate-distance bound.
    • To enhance the efficiency and security of multiparty quantum communication.

    Main Methods:

    • Utilized a differential phase shift scheme combined with twin field concepts.
    • Developed a three-participant QSS protocol for practical implementation.

    Main Results:

    • The new protocol breaks the conventional linear rate-distance limitation.
    • Achieved a theoretical improvement of three orders of magnitude in secret key rate over 300 km.
    • Demonstrated security against Trojan horse attacks, a vulnerability in prior protocols.

    Conclusions:

    • The proposed QSS protocol offers a significant advancement for high-efficiency multiparty quantum communication.
    • This work paves the way for more robust and long-distance quantum key distribution.