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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Quantum key distribution over multicore fiber.

J F Dynes, S J Kindness, S W-B Tam

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    Summary
    This summary is machine-generated.

    This study demonstrates the first quantum key distribution (QKD) experiment using multicore fiber. Weak QKD signals coexist with high-power classical data, enabling secure communication alongside existing infrastructure.

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    Area of Science:

    • Quantum communication
    • Optical fiber technologies
    • Information security

    Background:

    • Quantum key distribution (QKD) offers enhanced security but requires dedicated fiber infrastructure.
    • Integrating QKD with existing classical communication networks is a significant challenge.

    Purpose of the Study:

    • To demonstrate the feasibility of coexisting quantum key distribution (QKD) signals with classical data signals in multicore fiber.
    • To assess the performance impact of classical data on QKD signals within a shared fiber.
    • To explore the potential for high-bandwidth classical data transmission alongside high-speed QKD.

    Main Methods:

    • Implementation of a QKD experiment utilizing space division multiplexing over a 53 km, 7-core fiber.
    • Characterization of intercore crosstalk to quantify signal interference.
    • Performance evaluation of QKD signals in the presence of full-power classical data signals.

    Main Results:

    • Successful coexistence of weak QKD signals and high-power classical data signals in a 7-core fiber over 53 km.
    • Negligible degradation in QKD performance due to the presence of classical data.
    • Simulations indicate potential for supporting classical data bandwidths exceeding 1 Tb/s alongside high-speed QKD.

    Conclusions:

    • Multicore fiber with space division multiplexing is a viable platform for integrated classical and quantum communication.
    • The proposed method allows for the deployment of QKD without compromising existing high-bandwidth data services.
    • This approach paves the way for cost-effective and scalable quantum-secured communication networks.