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Integrated InP-based transmitter for continuous-variable quantum key distribution.

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    This summary is machine-generated.

    This study developed a compact quantum key distribution (QKD) transmitter using indium phosphide (InP) photonic integrated circuits (PICs). The system achieved a 78 kbps secret key rate over 11 km fiber, demonstrating potential for market adoption.

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    Area of Science:

    • Quantum Information Science
    • Integrated Photonics
    • Quantum Cryptography

    Background:

    • Quantum Key Distribution (QKD) systems offer enhanced security but face challenges in size, cost, and complexity.
    • Monolithic Photonic Integrated Circuits (PICs) present a solution for miniaturizing and cost-effectively producing QKD systems.

    Purpose of the Study:

    • To design, fabricate, and characterize an InP-based PIC transmitter for Continuous-Variable (CV) QKD.
    • To evaluate the performance of the integrated CV-QKD system in a practical fiber optic channel.

    Main Methods:

    • Development of an Indium Phosphide (InP) based PIC transmitter.
    • Implementation of a pulsed Gaussian-modulated coherent state (GMCS) CV-QKD protocol.
    • Experimental testing over an 11 km optical fiber channel.

    Main Results:

    • Successful design, fabrication, and characterization of the InP PIC transmitter.
    • Demonstrated a secret key rate of 78 kbps in the asymptotic regime over 11 km fiber.
    • The system's performance is compatible with practical CV-QKD applications.

    Conclusions:

    • InP-based PICs hold significant potential for integrating CV-QKD systems onto a single, compact platform.
    • This technology can accelerate the adoption of QKD in various markets due to reduced size, cost, and complexity.
    • The demonstrated performance validates the feasibility of integrated PICs for secure quantum communication.