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Random bit generation using coherent state and threshold detectors at 1550 nanometers.

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    We developed a practical method for generating random bits using a single-photon detector. This technique leverages photon detection events to create secure random number generation for quantum communications.

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    Area of Science:

    • Quantum Optics
    • Information Security

    Background:

    • Random number generation is crucial for secure communication.
    • Existing methods face challenges in practical implementation for quantum systems.

    Purpose of the Study:

    • To propose and validate a practical random bit generation method.
    • To utilize few-photon coherent state detections for randomness.

    Main Methods:

    • Theoretically proposed and experimentally validated a method using a gated single-photon threshold detector.
    • Operated at telecom wavelength (1550 nm) with a coherent state.
    • Tuned photon number for a 50-50 detection/no-detection probability, assigning '1' to detection and '0' to no-detection.

    Main Results:

    • Achieved random bit strings through hardware implementation.
    • Validated randomness using a standard test suite with good confidence.
    • Demonstrated a similar method using a free-running detector with chopped light for higher throughput.

    Conclusions:

    • The proposed method offers a practical approach to random bit generation.
    • Hardware compatibility with quantum key distribution (QKD) setups is a key advantage.
    • Potential for integration into practical quantum communication systems.