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    This study presents an enhanced active beam-wander correction technique for free-space quantum communications. The method significantly improves laser beam coupling efficiency and stabilizes entangled photons despite atmospheric turbulence.

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    Area of Science:

    • Quantum communication
    • Optical engineering
    • Atmospheric optics

    Background:

    • Free-space quantum communication requires stable beam coupling into single-mode fibers (SMFs) to reduce noise.
    • Atmospheric turbulence causes beam wander, degrading coupling efficiency and entangled state fidelity.
    • Existing methods struggle with initial misalignment and dynamic turbulence effects.

    Purpose of the Study:

    • To develop and validate a highly-enhanced active beam-wander correction technique.
    • To efficiently couple and stabilize beams into SMFs, even with initial misalignment.
    • To mitigate atmospheric turbulence effects in free-space optical links.

    Main Methods:

    • Implementation of a single-mode fiber (SMF) auto-coupling algorithm.
    • Deployment of a decoupled stabilization method for beam wander correction.
    • Quantitative measurement of coupling efficiency (coincidence counts) for laser and entangled photon sources.
    • Assessment of polarization-entangled state fidelity restoration.

    Main Results:

    • Significant improvement in mean coupling efficiency (over 50% for laser, 14% for entangled photons).
    • Substantial reduction in coupling efficiency standard deviation (4.4-fold for laser, 2-fold for entangled photons) over 2.6 km turbulence.
    • Restoration of polarization-entangled state fidelity to near-source levels.
    • Demonstrated effectiveness even with initial optical misalignment.

    Conclusions:

    • The proposed active beam-wander correction technique enhances spatial light-fiber coupling for free-space quantum communications.
    • The method reliably corrects beam wander caused by atmospheric turbulence.
    • This work is crucial for designing robust free-space quantum and high-speed laser communication systems.