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Simultaneous quantum and classical communication using pulse position modulation for inter-satellite links.

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    This study introduces a terahertz quantum key distribution protocol for satellite communication. It enables secure quantum key distribution alongside classical data transmission using pulse position modulation.

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    Area of Science:

    • Quantum Communication
    • Terahertz Technology
    • Satellite Networks

    Background:

    • Inter-satellite links require secure communication methods.
    • Existing quantum key distribution (QKD) protocols face challenges in satellite environments.
    • Simultaneous classical and quantum communication is desirable for efficiency.

    Purpose of the Study:

    • To propose a novel terahertz continuous-variable quantum key distribution (CV-QKD) protocol.
    • To enable simultaneous quantum and classical communication for inter-satellite links.
    • To validate the protocol's feasibility through extensive simulations.

    Main Methods:

    • Utilizing terahertz (THz) signals with Gaussian modulation for quantum information.
    • Employing pulse position modulation (PPM) for classical information encoding.
    • Implementing coherent detection to measure all relevant parameters.
    • Conducting multi-parameter simulations to analyze performance.

    Main Results:

    • The protocol demonstrates feasibility for quantum key distribution.
    • Evaluated bit error rate, secret key rate, and transmission distance under various PPM settings.
    • Simulations confirm the protocol's effectiveness for secure satellite communication.

    Conclusions:

    • The proposed terahertz CV-QKD protocol is a viable solution for secure inter-satellite communication.
    • It effectively integrates classical data transmission with quantum key distribution.
    • This work paves the way for advanced quantum communication networks in space.