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    Area of Science:

    • Quantum optics
    • Free-space quantum communication

    Background:

    • Correlated photon pairs from spontaneous parametric down-conversion (SPDC) are crucial for quantum communication.
    • Atmospheric turbulence, specifically beam wander, degrades the performance of free-space quantum links.
    • Targeting accuracy is a significant challenge for long-distance quantum communication.

    Purpose of the Study:

    • To investigate the use of intrinsic correlations between pump and output photon spatial modes to counteract atmospheric beam wander.
    • To demonstrate a method for mitigating targeting errors in free-space quantum communication.

    Main Methods:

    • Experimental investigation of correlated photon pairs generated via SPDC.
    • Utilizing the spatial mode correlations between pump and down-converted photons.
    • Employing a spatially resolved array of single photon avalanche diodes (SPAD-array) to observe beam deflection.

    Main Results:

    • Demonstrated the observation of beam deflection using a SPAD-array.
    • Showcased the potential of spatial mode correlations to mitigate atmospheric beam wander effects.
    • Provided experimental evidence for improved targeting in turbulent atmospheric conditions.

    Conclusions:

    • The intrinsic spatial correlations of SPDC photon pairs can effectively mitigate atmospheric beam wander.
    • This approach offers a promising solution for enhancing the stability and reliability of free-space quantum communication.
    • Experimental validation using a SPAD-array confirms the feasibility of the proposed mitigation technique.