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    We developed a novel time synchronization method for quantum communication. This technique uses a low-power beacon to precisely correlate photon arrival times, minimizing jitter for robust long-distance quantum networks.

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    Area of Science:

    • Quantum Information Science
    • Optical Communication Systems
    • Metrology

    Background:

    • Accurate timing is crucial for correlating photon arrival times in quantum communication.
    • Existing synchronization methods can be complex or introduce significant noise.
    • Long-distance quantum links, especially those involving satellites, face challenges with clock drift.

    Purpose of the Study:

    • To present a novel, low-impact time synchronization method for quantum communication.
    • To enable precise correlation of photon arrival times over shared quantum channels.
    • To address challenges posed by clock drift in long-distance quantum communication.

    Main Methods:

    • A low-power, low-frequency synchronization beacon is utilized.
    • The beacon shares the same quantum channel as the quantum signals.
    • Standard single-photon detectors within the quantum communication system are used for detection.

    Main Results:

    • Experimental validation demonstrates system jitter approaching the resolution limit.
    • The synchronization method shows negligible impact on the quantum channel's performance.
    • The method is effective in realistic use case scenarios.

    Conclusions:

    • The presented time synchronization method is highly effective for quantum communication.
    • It offers a robust solution for correlating photon arrival times with minimal disruption.
    • This technique is particularly advantageous for long-distance quantum communication, including satellite-based links with significant clock drift.