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    Area of Science:

    • Quantum Information Science
    • Optical Communication Systems

    Background:

    • Continuous-variable quantum key distribution (CV-QKD) is vulnerable to environmental factors.
    • Real-time monitoring of system parameters is crucial for stable quantum communication.

    Purpose of the Study:

    • To propose a novel data acquisition method for real-time local oscillator (LO) intensity monitoring in CV-QKD.
    • To investigate the impact of weather conditions on CV-QKD performance metrics.

    Main Methods:

    • Development of a data acquisition technique for real-time LO intensity monitoring.
    • Experimental analysis of the influence of relative wetness, visibility, and beam jitter on average transmittance and excess noise.

    Main Results:

    • The proposed method enables effective real-time monitoring of LO intensity.
    • Weather conditions significantly affect average transmittance and introduce excess noise, impacting QKD security.
    • Identified specific weather parameters correlating with performance degradation.

    Conclusions:

    • The developed method is essential for robust CV-QKD systems operating in real-world conditions.
    • Understanding environmental influences is key to enhancing the reliability and security of quantum communication networks.