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A Post-Processing Method for Quantum Random Number Generator Based on Zero-Phase Component Analysis Whitening.

Longju Liu1, Jie Yang1, Mei Wu1

  • 1National Key Laboratory of Security Communication, Institute of Southwestern Communication, Chengdu 610041, China.

Entropy (Basel, Switzerland)
|January 24, 2025
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Summary
This summary is machine-generated.

This study introduces Zero-phase Component Analysis (ZCA) whitening to improve Quantum Random Number Generators (QRNGs). The method enhances raw data quality, enabling QRNGs to pass NIST randomness tests.

Keywords:
post-processingquantum random number generatorzero-phase component analysis whitening

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Area of Science:

  • Quantum Physics
  • Information Security

Background:

  • Quantum Random Number Generators (QRNGs) offer theoretically perfect randomness.
  • Practical QRNG implementations suffer from noise and imperfections, degrading random bit quality.
  • Post-processing is crucial for extracting true quantum randomness from raw QRNG data.

Purpose of the Study:

  • To propose and experimentally verify a novel post-processing method for QRNGs.
  • To improve the quality and generation rate of random bits from QRNGs.
  • To ensure the final random bits meet rigorous randomness standards.

Main Methods:

  • Developed a post-processing technique utilizing Zero-phase Component Analysis (ZCA) whitening.
  • Experimentally validated the method through time and spectral domain analysis.
  • Applied randomness extraction after ZCA whitening.

Main Results:

  • ZCA whitening effectively reduced auto-correlations in raw QRNG data.
  • The method flattened the raw data spectrum, enhancing randomness.
  • The post-processed random numbers successfully passed the NIST statistical test suite.

Conclusions:

  • ZCA whitening is an effective post-processing technique for QRNGs.
  • The proposed method significantly improves the quality and generation rate of QRNGs.
  • This approach ensures the generation of high-quality, certifiably random numbers for secure applications.