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High speed prototype quantum key distribution system and long term field trial.

A R Dixon, J F Dynes, M Lucamarini

    Optics Express
    |April 4, 2015
    PubMed
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    This study demonstrates a high-speed Quantum Key Distribution (QKD) system, achieving 878 Gbit of secure data over 34 days. The robust prototype offers a sustained 300 kbit/s key rate in a real-world Tokyo fiber network.

    Area of Science:

    • Quantum Information Science
    • Network Security
    • Applied Physics

    Background:

    • Information security in communication networks is a critical global challenge.
    • Quantum Key Distribution (QKD) offers unique security features, enabling intrusion detection and preventing information leakage.
    • Existing QKD systems face limitations in speed and real-world deployment robustness.

    Purpose of the Study:

    • To report a record high bit rate prototype Quantum Key Distribution (QKD) system.
    • To demonstrate the system's performance and robustness in a metropolitan fiber network.
    • To provide a comprehensive security analysis including finite key size effects and decoy states.

    Main Methods:

    • Deployment of a compact, robust, and automatically stabilized QKD prototype.

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  • Operation over a standard 45 km metropolitan telecommunication fiber link in Tokyo.
  • Utilized an efficient QKD protocol with decoy states and finite key size analysis.

    • Main Results:

    • Achieved a total of 878 Gbit of secure key data over a 34-day period.
    • Sustained a record high key rate of approximately 300 kbit/s.
    • Demonstrated reliable key distribution across diverse weather conditions with a quantified key failure probability of ε = 10⁻¹⁰.

    Conclusions:

    • The prototype QKD system represents a significant advancement in high-speed, secure communication.
    • The system's robustness and performance in a real-world metropolitan network highlight its practical applicability.
    • The security analysis confirms the system's reliability for secure key distribution.