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    Area of Science:

    • Optics and Photonics
    • Information Security
    • Laser Physics

    Background:

    • Physical random number generators (RNGs) are crucial for secure communication and cryptography.
    • Existing frequency division multiplexing schemes enhance random bit generation rates.
    • Spatially multiplexed lasers for parallel RNGs face challenges due to limited independent transverse modes.

    Purpose of the Study:

    • To propose and demonstrate a spatiotemporal chaotic laser array for spatially parallel RNGs.
    • To overcome the limitations of transverse mode dependency in parallel RNGs.
    • To enable high-rate random bit generation through spatial parallelism.

    Main Methods:

    • Utilizing a single degenerate cavity laser to induce spatiotemporal chaos via transverse-mode competition.
    • Implementing a 4x4 chaotic laser array using a two-dimensional amplitude mask with apertures.
    • Employing offline postprocessing for random bit generation.

    Main Results:

    • Demonstrated spontaneous spatiotemporal chaos in a single degenerate cavity laser.
    • Achieved a 4x4 independent chaotic laser array with cross-correlation coefficients below 0.05.
    • Generated 16 spatially parallel RNGs with a total rate of 3.2 Mbps.

    Conclusions:

    • The proposed spatiotemporal chaotic laser array offers a novel solution for spatially parallel RNGs.
    • This method provides a new avenue for high-rate random bit generation using multimode lasers.
    • The findings have significant implications for secure communication and cryptographic applications.