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Updated: Dec 13, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Bias-free source-independent quantum random number generator.

Ziyong Zheng, Yichen Zhang, Min Huang

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    |August 6, 2020
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    This study introduces a novel quantum random number generator that eliminates bias and noise. The new method achieves high-speed, secure random number generation and can be integrated into compact devices.

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    Area of Science:

    • Quantum Information Science
    • Quantum Optics
    • Cryptography

    Background:

    • Quantum random number generators (QRNGs) are crucial for secure communication.
    • Existing QRNGs can suffer from system bias and noise.
    • Vacuum fluctuation measurement offers a promising avenue for unbiased random number generation.

    Purpose of the Study:

    • To propose a bias-free, source-independent QRNG scheme.
    • To eliminate system bias and common mode noise.
    • To investigate the performance of measuring conjugate quadratures with varying intensities.

    Main Methods:

    • A novel QRNG scheme based on vacuum fluctuation measurement.
    • Derivation of optimal parameter settings to avoid simultaneous quadrature measurement.
    • Experimental demonstration of the proposed scheme.

    Main Results:

    • Achieved 4.2 Gbps bias-free, source-independent random number generation.
    • Demonstrated a common mode rejection ratio of 61.17 dB.
    • Investigated performance differences between equal and unequal quadrature intensity measurements.

    Conclusions:

    • The proposed scheme effectively eliminates system bias and common mode noise.
    • The all-optical method facilitates integration into compact chips.
    • This work provides a new approach for high-performance QRNGs.