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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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    This study introduces a new method for generating ultrafast random numbers (RN) using a photonic entropy source. The technique achieves high-speed, bias-free RN extraction without post-processing, overcoming limitations of current physical RN generators.

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    Area of Science:

    • Photonics
    • Information Security
    • Chaos Engineering

    Background:

    • Current physical random number generators face limitations due to electronic jitter and require post-processing.
    • Ultrafast random number generation is crucial for secure communication and complex simulations.

    Purpose of the Study:

    • To present a real-time scheme for ultrafast random number extraction from a broadband photonic entropy source.
    • To overcome the electronic jitter bottleneck and eliminate the need for post-processing in random number generation.

    Main Methods:

    • Utilizing ultralow jitter mode-locked pulses to sample stochastic intensity fluctuations of a photonic entropy source.
    • Employing discrete self-delay comparison technology to quantize sampled pulses into continuous random number streams.
    • Demonstrating feasibility with an optically injected chaotic laser diode.

    Main Results:

    • Successfully extracted random number streams at up to 7 Gb/s in real time.
    • The scheme is bias-free and does not require threshold tuning or post-processing.
    • Verified randomness of the extracted random number streams.

    Conclusions:

    • The presented real-time scheme offers a novel approach for high-speed, bias-free random number generation.
    • This photonic method eliminates electronic jitter bottlenecks and post-processing requirements.
    • Future work can achieve random number generation rates of tens of gigabits per second with sufficient photonic entropy source bandwidth.