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Continuous-variable quantum key distribution based on non-Gaussian operations with on-off detection.

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    Continuous variable quantum key distribution (CVQKD) can be enhanced using photon addition. This study shows photon addition on the sender

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    Area of Science:

    • Quantum Information Science
    • Quantum Cryptography
    • Quantum Optics

    Background:

    • Continuous variable quantum key distribution (CVQKD) offers high key rates but is limited by transmission distance.
    • Non-Gaussian operations like photon addition/subtraction are proposed to overcome distance limitations, typically requiring ideal photon sources and detectors.
    • Realistic implementations necessitate evaluating these operations with practical photon sources and detectors.

    Purpose of the Study:

    • To investigate the impact of non-Gaussian operations (photon addition and subtraction) on CVQKD performance using a realistic photon source and ideal on-off photon detection.
    • To determine the optimal placement and type of non-Gaussian operation for enhancing CVQKD in realistic scenarios.

    Main Methods:

    • Simulated CVQKD protocols incorporating non-Gaussian operations (photon addition and subtraction).
    • Utilized a realistic photon source model and ideal on-off photon detection.
    • Analyzed the effect of operations before and after the entangled source, and before sender Alice's heterodyne detection.

    Main Results:

    • Photon subtraction/addition before the entangled source or before Alice's detection did not improve CVQKD performance with a realistic source.
    • Photon addition performed on the sender's side (left side) before the entangled source enhanced CVQKD performance, particularly for long-distance transmissions.
    • The effectiveness of non-Gaussian operations is highly dependent on the specific implementation and photon source characteristics.

    Conclusions:

    • Photon addition on the sender's side shows promise for extending the reach of CVQKD under realistic conditions.
    • The study provides crucial insights for optimizing CVQKD systems by highlighting the importance of realistic source modeling and strategic placement of non-Gaussian operations.
    • These findings offer valuable guidance for the development of practical quantum communication networks.