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Time-division technique for quantum optical receivers utilizing single-photon detector array technology and

Alfonso Tello Castillo, Ross Donaldson

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    |December 16, 2022
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    Summary
    This summary is machine-generated.

    This study enhances free-space quantum key distribution (QKD) by combining spatial-multiplexing and time-division techniques. This approach significantly reduces quantum bit error rates, paving the way for more cost-effective quantum networking solutions.

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    Area of Science:

    • Quantum Information Science
    • Optical Communications
    • Quantum Networking

    Background:

    • Free-space quantum key distribution (QKD) is crucial for developing the quantum internet.
    • Achieving high secret key rates is a primary challenge in QKD systems.
    • Existing solutions involve advanced electronics, untrusted relays, or high-dimensional QKD.

    Purpose of the Study:

    • To propose and demonstrate a novel technique for enhancing throughput in free-space QKD.
    • To address the challenge of turbulence-induced errors in free-space QKD.
    • To reduce the reliance on expensive superconducting nanowire single-photon detectors.

    Main Methods:

    • Utilizing a combination of spatial-multiplexing and time-division techniques.
    • Employing 2D single-photon avalanche diode arrays for detection.
    • Implementing time-division of spatial modes to mitigate optical crosstalk.

    Main Results:

    • Successfully reduced quantum bit error rate (QBER) caused by optical crosstalk from 36% to 0%.
    • Demonstrated increased throughput by integrating spatial-multiplexing and time-division methods.
    • Showcased the potential for cost-effective receiver systems in free-space QKD.

    Conclusions:

    • The proposed technique effectively minimizes turbulence-induced errors in free-space QKD.
    • This method offers a viable alternative to superconducting detectors for certain applications.
    • The integration of spatial-multiplexing and time-division enhances the practicality of quantum networking.