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    This study presents a compact, low-cost quantum random number generator using a simple optocoupler. It achieves a high random bit generation rate, making quantum randomness more accessible for practical applications.

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    Area of Science:

    • Quantum Physics
    • Optoelectronics
    • Information Security

    Background:

    • Existing quantum random number generation (QRNG) schemes face limitations in cost, size, and generation rate.
    • Widespread adoption of QRNGs is hindered by these practical constraints.

    Purpose of the Study:

    • To develop and demonstrate a compact, low-cost, and efficient quantum random number generation system.
    • To overcome the limitations of current QRNG technologies for commercial viability.

    Main Methods:

    • Utilized a linear optocoupler, integrating a light-emitting diode (LED) and photodetector.
    • Generated random bits by measuring the intrinsic intensity noise of the LED's output light.
    • Employed the SHA-256 algorithm for post-processing the generated random bits.

    Main Results:

    • Achieved a random bit generation rate of 43 Mbps after SHA-256 post-processing.
    • Demonstrated robustness against environmental operating condition fluctuations.
    • Obtained random bit sequences with low autocorrelation coefficients (standard deviation of 3.16×10⁻⁴).
    • Successfully passed the NIST-Statistical Test Suite, confirming high-quality randomness.

    Conclusions:

    • The proposed optocoupler-based QRNG offers a compact, simple, and cost-effective solution.
    • The system's high generation rate and robustness are significant for practical and commercial applications.
    • The technology paves the way for broader implementation of secure quantum random number generation.