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Towards combined quantum bit detection and spatial tracking using an arrayed single-photon sensor.

Ross Donaldson, Dmytro Kundys, Aurora Maccarone

    Optics Express
    |April 6, 2021
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    Summary
    This summary is machine-generated.

    This study demonstrates a novel 2D single-photon detector array for quantum key distribution. This technology simplifies hardware for free-space quantum communication by combining signal detection and spatial tracking.

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    Area of Science:

    • Quantum Information Science
    • Optical Engineering
    • Detector Physics

    Background:

    • Free-space quantum key distribution (QKD) requires precise telescope alignment.
    • Current hardware setups for QKD are complex and costly.
    • Integrating quantum bit detection with spatial tracking can simplify systems.

    Purpose of the Study:

    • To investigate the use of a 2D CMOS single-photon avalanche diode (SPAD) detector array.
    • To simultaneously measure quantum interference and track spatial signals in free-space optical links.
    • To assess the feasibility of 2D SPADs for low-light free-space communication.

    Main Methods:

    • Applied a 2D CMOS SPAD detector array to a free-space time-bin receiver interferometer.
    • Monitored single-photon level interference patterns.
    • Simultaneously tracked the spatial position of the single-photon signal.
    • Verified an angular field-of-view of 1.28°.
    • Implemented a post-processing technique for background noise reduction.

    Main Results:

    • Successfully measured and monitored single-photon interference.
    • Demonstrated simultaneous spatial tracking of the optical signal.
    • Verified the detector's angular field-of-view.
    • Showcased effective background noise reduction through post-processing.

    Conclusions:

    • 2D single-photon detectors offer a promising solution for simplifying hardware in free-space quantum communications.
    • This technology can significantly advance low-light level free-space optical links, including QKD.
    • The integrated detection and tracking capabilities pave the way for more robust and efficient quantum communication systems.