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Experimental demonstration of a local active phase compensation method for a phase encoding quantum key distribution

Yue Zhang, Junyue Yin, Huiqing Zhao

    Applied Optics
    |October 18, 2022
    PubMed
    Summary

    A new local active phase compensation scheme stabilizes quantum key distribution (QKD) systems. This method enables independent phase compensation for each interferometer node, improving stability in network-scale quantum communication applications.

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    Area of Science:

    • Quantum Information Science
    • Quantum Communication Technology
    • Optical Network Stability

    Background:

    • Practical quantum key distribution (QKD) requires efficient phase stabilization.
    • Existing active phase compensation methods face limitations in multi-node and network-scale QKD applications, particularly those using measurement-device-independent QKD.

    Purpose of the Study:

    • To propose and demonstrate a novel local active phase compensation scheme for QKD systems.
    • To enable independent phase compensation for each interferometer node within a network.

    Main Methods:

    • Development of a local active phase compensation scheme.
    • Experimental demonstration using a BB84 phase encoding system.
    • Implementation with a Faraday-Michelson interferometer and two forms of reference light.

    Main Results:

    • The proposed scheme achieved average Quantum Bit Error Rate (QBER) of 1.9% and 1.6% with different reference light configurations.
    • Successful independent phase compensation for each interferometer node was demonstrated.

    Conclusions:

    • The developed local active phase compensation scheme enhances stability in QKD systems.
    • This method is applicable to various QKD systems and shows promise for future quantum communication networks.