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    Area of Science:

    • Quantum Information Science
    • Optical Communications
    • Cryptography

    Background:

    • Quantum noise stream cipher (QNSC) offers enhanced security through quantum noise.
    • Continuous-variable quantum key distribution (CV-QKD) generates secret keys using similar optical architectures.
    • Integrating QKD and QNSC is crucial for advanced secure communication systems.

    Purpose of the Study:

    • To develop an integrated system for simultaneous quantum key distribution and quantum noise stream cipher transmission.
    • To enhance channel capacity and mitigate polarization fluctuations in optical quantum communication.

    Main Methods:

    • Utilized polarization division multiplexing (PDM) to increase channel capacity.
    • Implemented a polarization-interleaved subcarrier modulation (PISCM) scheme to manage dynamic polarization variations.
    • Employed a linear feedback shift register (LFSR) to expand the QKD key rate.

    Main Results:

    • Achieved simultaneous transmission of QKD and QNSC signals over a single 20 km optical channel.
    • Maintained a QKD secure key rate of 4.93 Mbps and a QNSC transmission rate of 100 Mbps.
    • Expanded the QKD key rate to 400 Mbps for synchronization with the QNSC signal.

    Conclusions:

    • Demonstrated a viable pathway towards integrated communication and encryption systems using quantum technologies.
    • The PISCM scheme effectively mitigates polarization state variations, crucial for stable quantum signal transmission.
    • High-speed QKD and QNSC integration shows significant potential for future secure networks.