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Updated: Jan 19, 2026

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Practical security of the continuous-variable quantum key distribution with real local oscillators under phase

Biao Huang, Yongmei Huang, Zhenming Peng

    Optics Express
    |September 13, 2019
    PubMed
    Summary

    This study introduces a phase attack on continuous-variable quantum key distribution (CVQKD) using real local oscillators, revealing new security vulnerabilities. A novel detection method monitors phase compensation errors to identify and mitigate such attacks, enhancing CVQKD security.

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    Area of Science:

    • Quantum Information Science
    • Cybersecurity
    • Applied Physics

    Background:

    • Continuous-variable quantum key distribution (CVQKD) systems using real local oscillators (LOs) face security challenges from reference pulses transmitted alongside quantum signals.
    • These reference pulses can be exploited by eavesdroppers to compromise the security of the quantum channel.

    Purpose of the Study:

    • To propose and analyze a novel phase attack targeting the reference pulses in real LO CVQKD systems.
    • To develop an effective method for detecting the intensity of this phase attack.
    • To assess the practical security implications of the proposed attack on CVQKD.

    Main Methods:

    • A phase attack strategy is introduced, manipulating reference pulse phase drifts to increase phase compensation errors for quantum signals.
    • A noise model for imperfect phase compensation is developed to analyze the practical security of CVQKD under the phase attack.
    • A detection method is proposed, involving real-time monitoring of phase compensation error deviations between quantum and reference signals.

    Main Results:

    • The phase attack effectively reduces the secret key rate by introducing imperfect phase compensation.
    • The security analysis accurately quantifies the impact of the phase attack on CVQKD.
    • Simulation results confirm the feasibility and accuracy of the proposed phase attack detection method.

    Conclusions:

    • The proposed phase attack poses a significant security threat to real LO CVQKD systems.
    • The developed detection method provides a practical means to identify and potentially counteract phase attacks.
    • This research contributes to enhancing the security and robustness of quantum key distribution technologies.