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    This study demonstrates a table-top quantum secure direct communication (QSDC) system using squeezed light for enhanced security. The findings show squeezed states outperform coherent states in noisy quantum communication channels.

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    Area of Science:

    • Quantum Communication
    • Quantum Information Science
    • Optical Physics

    Background:

    • Quantum secure direct communication (QSDC) offers a novel framework for transmitting information securely via quantum channels, distinct from key-based quantum key distribution (QKD).
    • Optical QSDC protocols, employing discrete and continuous variable encodings, are crucial for advancing secure communication technologies.

    Purpose of the Study:

    • To present the first table-top proof of principle for continuous-variable QSDC.
    • To analyze the implementation of QSDC using coherent versus squeezed light sources.
    • To evaluate the security and reliability of QSDC in practical, lossy, and noisy environments.

    Main Methods:

    • Development and analysis of a table-top continuous-variable QSDC system.
    • Comparison of coherent and squeezed light sources for QSDC implementation.
    • Security analysis using Wyner wiretap channel theory against a beam-splitter attack.

    Main Results:

    • Squeezed states provide superior security and reliability compared to coherent states in lossy and noisy quantum communication channels.
    • The practical QSDC implementation demonstrates feasibility using standard telecom components.
    • Wyner wiretap channel theory confirms the enhanced security offered by squeezed states.

    Conclusions:

    • Continuous-variable QSDC is a viable technology for secure communication.
    • Squeezed light sources enhance the security and robustness of QSDC systems.
    • The developed system can potentially support secure quantum metropolitan networks with multiplexing capabilities.