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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Performance analysis of free-space quantum key distribution using multiple spatial modes.

Wenhua He, Saikat Guha, Jeffrey H Shapiro

    Optics Express
    |July 16, 2021
    PubMed
    Summary
    This summary is machine-generated.

    Spatial-mode multiplexing enhances free-space quantum key distribution (QKD) key rates. Flat-top focused beams offer practical advantages over Laguerre-Gaussian modes, especially in turbulent conditions.

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    Area of Science:

    • Quantum Information Science
    • Optical Communication Systems
    • Free-Space Optics

    Background:

    • Free-space optical quantum key distribution (QKD) systems can enhance key rates using multiple spatial modes.
    • High-dimensional QKD or spatial-mode multiplexing are methods to achieve this improvement.

    Purpose of the Study:

    • To theoretically analyze spatial-mode-multiplexed decoy-state BB84 QKD.
    • To compare the performance of flat-top focused beams (FBs) and Laguerre-Gaussian (LG) modes as transmitter modes.

    Main Methods:

    • Theoretical analysis of spatial-mode-multiplexed decoy-state BB84 protocol.
    • Comparison of FB and LG modes in vacuum and turbulent propagation conditions.

    Main Results:

    • Spatial-mode multiplexing generally offers higher key rates compared to high-dimensional QKD.
    • In vacuum, LG modes show a higher QKD rate than FBs.
    • FB modes demonstrate potential to outperform LG modes in the presence of turbulence.

    Conclusions:

    • Spatial-mode multiplexing is a viable strategy for improving free-space QKD key rates.
    • FB modes present a practical and potentially superior alternative to LG modes for QKD systems, particularly in atmospheric conditions.