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Multicore fiber beacon system for reducing back-reflection in satellite quantum key distribution.

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    A novel multicore fiber beacon system significantly reduces noise in free-space quantum key distribution (QKD). This method improves optical communication by spatially separating channels, offering enhanced noise rejection for QKD systems.

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    Area of Science:

    • Quantum communication
    • Optical engineering
    • Signal processing

    Background:

    • Free-space quantum key distribution (QKD) relies on optical beaconing for acquisition, pointing, and tracking.
    • Uplink beacon back-reflections from receiver architectures introduce noise, degrading QKD performance.
    • Existing solutions like wavelength- and time-division multiplexing are insufficient; additional telescopes increase complexity.

    Purpose of the Study:

    • To propose and demonstrate a novel optical uplink beacon source using a 2-by-2 multicore fiber.
    • To spatially separate the QKD channel and the optical uplink beacon to mitigate back-reflection noise.
    • To improve the noise performance and reduce the complexity of free-space and satellite QKD systems.

    Main Methods:

    • Implementation of a 2-by-2 multicore fiber as an optical uplink beacon source.
    • Spatial separation of the QKD channel and the optical uplink beacon within the multicore fiber.
    • Experimental demonstration and noise rejection performance evaluation compared to spectrally divided systems.

    Main Results:

    • Demonstrated up to 50 dB improvement in noise rejection compared to purely spectrally divided systems.
    • Successful spatial separation of the QKD channel and optical uplink beacon.
    • Identified a clear route for further noise performance improvements through increased fiber core separation.

    Conclusions:

    • The proposed multicore fiber beacon system offers a significant advancement in noise reduction for free-space QKD.
    • This approach provides a simpler and more effective solution than current methods, reducing complexity and improving noise performance.
    • The technology holds promise for enhancing the reliability of free-space and satellite QKD and optical communication systems.