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Adjustable spatial filter for optimal free-space quantum communication round the clock.

Andrej Kržič, Nico Döll, Uday Chandrashekara

    Optics Express
    |October 20, 2023
    PubMed
    Summary
    This summary is machine-generated.

    An adjustable spatial filter improves daylight free-space quantum communication by dynamically optimizing the field of view. This active optimization enhances secure key generation in quantum key distribution systems.

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    Area of Science:

    • Quantum Information Science
    • Optical Engineering

    Background:

    • Daylight free-space quantum communication requires effective spatial filtering.
    • Optimal spatial filter configurations are dynamic due to changing environmental conditions.

    Purpose of the Study:

    • To develop and evaluate an adjustable spatial filter for real-time field-of-view adjustment.
    • To enhance the performance of free-space quantum communication systems under varying link conditions.

    Main Methods:

    • Development of an adjustable spatial filter for on-the-fly field-of-view modification.
    • Experimental demonstration in a 1.7-km free-space quantum key distribution link.
    • Comparison with multi-mode fiber coupling for filtering.

    Main Results:

    • The adjustable spatial filter was successfully implemented in a free-space quantum key distribution system.
    • Performance was evaluated against multi-mode fiber coupling.
    • Extrapolation suggests significant improvements in secure key output under realistic conditions.

    Conclusions:

    • Active field-of-view optimization using an adjustable spatial filter is crucial for robust daylight free-space quantum communication.
    • This technology offers a substantial potential to increase the overall secure key rate in practical quantum communication networks.