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    We developed a photonics-based method for ultrafast physical random bit generation using a terahertz optical asymmetric demultiplexer (TOAD). This approach overcomes electronic limitations, achieving 5 Gb/s random bit stream generation from chaotic laser output.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Information Security

    Background:

    • Existing random bit generators (RBGs) face limitations due to electronic jitter.
    • Ultrafast and secure random number generation is crucial for modern cryptography and simulations.

    Purpose of the Study:

    • To propose and demonstrate a fully photonics-based approach for ultrafast physical random bit generation.
    • To overcome the electronic bottleneck in current random bit generation technologies.

    Main Methods:

    • Utilizing a compact nonlinear loop mirror, specifically a terahertz optical asymmetric demultiplexer (TOAD).
    • Sampling chaotic optical waveforms in an all-optical domain.
    • Generating random bit streams by comparing sampled data with a threshold level.

    Main Results:

    • A proof-of-concept experiment successfully demonstrated the method.
    • Continuous extraction of 5 Gb/s random bit streams was achieved.
    • The generation rate was limited by the bandwidth of the utilized optical chaos.

    Conclusions:

    • The proposed photonics-based approach offers a viable solution for ultrafast physical random bit generation.
    • This method effectively bypasses the electronic jitter bottleneck inherent in traditional RBGs.
    • Further improvements in optical chaos bandwidth can enhance the generation rate.