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Efficient quantum digital signatures without symmetrization step.

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    This study introduces an efficient quantum digital signature (QDS) protocol that enhances security and speed. The new method significantly boosts the signature rate, offering unconditional security for digital communication.

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    Area of Science:

    • Quantum Information Science
    • Cryptography
    • Quantum Communication

    Background:

    • Quantum digital signatures (QDS) offer information-theoretic security for message authentication.
    • Existing QDS protocols are limited by the need for symmetrization and quadratic scaling of signature rates.

    Purpose of the Study:

    • To develop an efficient quantum digital signature protocol overcoming current limitations.
    • To enhance the signature rate and remove the requirement for symmetrization in QDS.

    Main Methods:

    • Utilized a classical post-processing technique called the post-matching method.
    • Developed a QDS protocol that avoids the symmetrization step.
    • Analyzed the scaling of the signature rate with detection event probability.

    Main Results:

    • The new QDS protocol achieves a linear scaling of the signature rate.
    • Eliminated the need for the symmetrization step and secure classical channels.
    • Demonstrated a signature rate three orders of magnitude higher than previous protocols over 100 km fiber.

    Conclusions:

    • The proposed QDS protocol offers improved efficiency and unconditional security.
    • Compatibility with existing quantum communication infrastructure facilitates practical implementation.
    • This advancement is expected to significantly contribute to secure digital communication.