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Continuous variable quantum key distribution based on simultaneous quantum and classical communication in the

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    This study introduces a terahertz-band quantum key distribution system that combines quantum and classical communication. The proposed scheme enhances secret key rates and anti-interference for secure wireless quantum networks.

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    Area of Science:

    • Quantum Information Science
    • Optical Communications
    • Terahertz Technology

    Background:

    • Continuous variable quantum key distribution (CVQKD) offers secure communication.
    • Simultaneous quantum and classical communication (SQCC) protocols enable integrated systems.
    • Inter-satellite communication presents unique challenges and opportunities for quantum networks.

    Purpose of the Study:

    • To propose and analyze an inter-satellite SQCC-CVQKD scheme operating in the terahertz (THz) band.
    • To demonstrate the security and performance of this novel scheme.
    • To provide a foundation for building robust wireless quantum communication networks.

    Main Methods:

    • Classical modulation followed by quantum Gaussian modulation at the transmitter.
    • Signal amplification and demultiplexing at the receiver.
    • Decoding using homodyne or heterodyne detection.

    Main Results:

    • Demonstrated the security of the SQCC-CVQKD system in the THz band.
    • Performance analysis in the finite-size regime.
    • Simulation results indicate a higher secret key rate and improved anti-interference capability.

    Conclusions:

    • The proposed inter-satellite SQCC-CVQKD scheme is secure and practical in the THz band.
    • This approach offers enhanced performance for wireless quantum communication.
    • The work facilitates the development of future quantum communication networks.