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Suppression of patterning effect using IQ modulator for high-speed quantum key distribution systems.

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    High-speed quantum key distribution (QKD) can be secured using in-phase/quadrature (IQ) modulators. These modulators offer stable decoy-state generation, overcoming security vulnerabilities found in conventional intensity modulators for QKD systems.

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    Area of Science:

    • Quantum Information Science
    • Optical Communications
    • Cybersecurity

    Background:

    • Quantum key distribution (QKD) enables secure key exchange over long distances.
    • Decoy-state protocols enhance QKD practicality and performance, now common in commercial systems.
    • Conventional intensity modulators pose security risks in high-speed QKD due to unstable decoy-state generation.

    Purpose of the Study:

    • To analyze the transfer function of in-phase/quadrature (IQ) modulators for QKD.
    • To demonstrate the superiority of IQ modulators for stable decoy-state generation.
    • To address security vulnerabilities in high-speed QKD systems.

    Main Methods:

    • Theoretical analysis of the IQ modulator transfer function.
    • Experimental demonstration of decoy-state generation using an IQ modulator.
    • Evaluation of modulation stability and security implications.

    Main Results:

    • IQ modulators exhibit superior stability for decoy-state generation compared to conventional methods.
    • The analysis confirmed the theoretical advantages of IQ modulators for QKD.
    • Experimental results validated the stable generation of decoy states.

    Conclusions:

    • IQ modulators are ideal for high-speed decoy-state QKD due to their stable performance.
    • The findings enhance the security and practicality of future QKD implementations.
    • IQ modulators offer a robust solution for secure communication technologies.