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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Plug-and-play continuous-variable quantum key distribution for metropolitan networks.

R Valivarthi, S Etcheverry, J Aldama

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    Summary
    This summary is machine-generated.

    We developed a plug-and-play continuous variable quantum key distribution (CV-QKD) system using Gaussian modulated quadratures. This novel system achieves high secret key rates, even with classical light present, making it suitable for metropolitan networks.

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    Area of Science:

    • Quantum Information Science
    • Quantum Cryptography
    • Optical Communication Systems

    Background:

    • Continuous variable quantum key distribution (CV-QKD) offers enhanced security.
    • Existing CV-QKD systems often require complex frequency locking mechanisms.
    • Integration into existing metropolitan optical networks presents challenges.

    Purpose of the Study:

    • To develop a simplified, plug-and-play CV-QKD system.
    • To demonstrate high secret key rates in a practical, real-world scenario.
    • To assess the system's compatibility with existing classical communication infrastructure.

    Main Methods:

    • Utilized Gaussian modulated quadratures and a true local oscillator for CV-QKD.
    • Employed two independent fiber strands to mitigate Rayleigh back-scattering.
    • Demonstrated quantum-classical co-existence by injecting high-power classical light.

    Main Results:

    • Achieved a secret key rate of 0.88 Mb/s over 13 km fiber links.
    • Maintained a key rate of 0.3 Mb/s with 4 mW of classical light present.
    • Successfully demonstrated quantum-classical co-existing capability.

    Conclusions:

    • The proposed CV-QKD system is plug-and-play and avoids laser frequency locking.
    • The system exhibits robust performance in the presence of classical light.
    • This technology shows potential as a low-cost solution for secure metropolitan optical networks.