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Decoy-state phase-matching quantum key distribution with source errors.

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    This study introduces a practical phase-matching quantum key distribution (PM-QKD) protocol using four-intensity decoy states and accounting for source errors. It enhances secure key distribution over longer distances without quantum repeaters.

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    Area of Science:

    • Quantum Information Science
    • Cryptography
    • Quantum Communication

    Background:

    • Point-to-point quantum key distribution (QKD) protocols face rate-distance limitations.
    • Twin-Field (TF) QKD and its phase-matching variant (PM-QKD) were proposed to overcome these limits without quantum repeaters.
    • Practical implementations of PM-QKD are hindered by the unavailability of infinite decoy states and perfect light source control.

    Purpose of the Study:

    • To propose a more practical version of the phase-matching quantum key distribution (PM-QKD) protocol.
    • To incorporate four-intensity decoy states and account for practical source errors in the PM-QKD protocol.
    • To analyze the performance and secure key rate of the proposed PM-QKD protocol under realistic conditions.

    Main Methods:

    • Development of a theoretical framework for a practical PM-QKD protocol.
    • Formulation of the secure key rate equation for the proposed protocol.
    • Numerical simulations to evaluate protocol performance with and without source errors.

    Main Results:

    • A practical PM-QKD protocol was formulated, utilizing four-intensity decoy states and considering source errors.
    • The secure key rate of the proposed protocol was mathematically derived.
    • Simulations demonstrated the protocol's performance under realistic conditions, including the impact of source errors.

    Conclusions:

    • The proposed PM-QKD protocol offers a more feasible approach to secure key distribution in real-world scenarios.
    • Accounting for source errors is crucial for accurate performance analysis of PM-QKD systems.
    • This work contributes to advancing practical quantum communication technologies by addressing implementation challenges.