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    Area of Science:

    • Quantum optics
    • Quantum information science
    • Nonlinear optics

    Background:

    • Quantum random number generators (QRNGs) are crucial for secure communication.
    • Existing QRNGs often face limitations in speed or complexity.
    • Macroscopic quantum phenomena offer potential for scalable QRNGs.

    Purpose of the Study:

    • To develop a novel method for simultaneously generating two strings of quantum random numbers.
    • To achieve high bit rates for quantum random number generation.
    • To demonstrate the feasibility of using macroscopic optical fields for QRNGs.

    Main Methods:

    • Utilizing intensity fluctuations of twin beams from a nondegenerate optical parametric oscillator.
    • Employing a post-processing algorithm to extract quantum random number strings at up to 60 Mb/s.
    • Implementing data post-selection and hash functions for identical quantum random number generation.

    Main Results:

    • Successfully generated two simultaneous strings of quantum random numbers.
    • Achieved bit rates up to 60 Mb/s for the generated random numbers.
    • Confirmed the high quality of the random numbers by passing all NIST randomness tests.
    • Demonstrated the generation of identical quantum random number strings.

    Conclusions:

    • The presented scheme is a feasible method for generating quantum random numbers from macroscopic optical fields.
    • High-speed, high-quality quantum random number generation is achievable using optical parametric oscillators.
    • This work contributes to the advancement of practical quantum random number generation technologies.