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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Adaptable transmitter for discrete and continuous variable quantum key distribution.

I H Lopez Grande, S Etcheverry, J Aldama

    Optics Express
    |May 14, 2021
    PubMed
    Summary
    This summary is machine-generated.

    We developed a versatile transmitter for quantum key distribution (QKD), enabling both discrete variable (DV-QKD) and continuous variable (CV-QKD) protocols. This technology achieves high secret key rates over significant distances, ideal for re-configurable quantum networks.

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    Area of Science:

    • Quantum Information Science
    • Quantum Communication
    • Cryptography

    Background:

    • Quantum Key Distribution (QKD) offers secure communication by leveraging quantum mechanics principles.
    • Implementing both discrete variable (DV-QKD) and continuous variable (CV-QKD) protocols typically requires distinct hardware setups.
    • The need for flexible and efficient QKD systems is growing, especially for adaptable optical network infrastructures.

    Purpose of the Study:

    • To present a novel, versatile transmitter capable of executing both DV-QKD and CV-QKD protocols.
    • To demonstrate the transmitter's performance in real-world quantum channel scenarios.
    • To highlight the transmitter's suitability for re-configurable optical networks.

    Main Methods:

    • Development of a single, versatile transmitter for quantum key distribution.
    • Implementation of a time-bin encoded BB84 DV-QKD protocol over a 47 km optical fiber channel.
    • Implementation of a Gaussian-modulated continuous-variable (GG02) CV-QKD protocol with a true local oscillator over a 10.5 km optical fiber channel.

    Main Results:

    • Achieved a secret key rate of 4.1 kbps for the DV-QKD protocol.
    • Achieved a secret key rate of 1 Mbps for the CV-QKD protocol.
    • Demonstrated the transmitter's capability to switch between DV- and CV-QKD protocols.

    Conclusions:

    • The presented versatile transmitter successfully supports both DV-QKD and CV-QKD protocols.
    • The system demonstrates practical secret key generation over substantial fiber optic links.
    • This versatile transmitter is well-suited for re-configurable optical networks, allowing protocol optimization based on link characteristics.