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True randomness from an incoherent source.

Bing Qi1

  • 1Quantum Information Science Group, Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6085, USA and Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA.

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This summary is machine-generated.

This study introduces a novel quantum random number generator (QRNG) using optical homodyne detection of thermal states. The method achieves high-quality random numbers, surpassing vacuum-based QRNGs in noise tolerance.

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Area of Science:

  • Quantum optics
  • Information science

Background:

  • Quantum random number generators (QRNGs) leverage quantum mechanics for true randomness.
  • Existing QRNGs often rely on vacuum fluctuations, which can be sensitive to noise.

Purpose of the Study:

  • To propose and experimentally demonstrate a new QRNG scheme based on thermal states.
  • To assess the performance and noise tolerance of the proposed QRNG.

Main Methods:

  • Measuring quadrature fluctuations of a single-mode thermal state using optical homodyne detection.
  • Utilizing a broadband amplified spontaneous emission (ASE) source and a single-mode local oscillator (LO).
  • Applying a Toeplitz-hashing extractor to process raw Gaussian data.

Main Results:

  • Observed quadrature variance three orders of magnitude larger than vacuum noise.
  • Demonstrated high entropy source quality with low correlation coefficients.
  • Achieved an efficiency of 5.12 bits per sample, passing NIST statistical tests.

Conclusions:

  • The proposed thermal state QRNG offers superior noise tolerance compared to vacuum-based methods.
  • The scheme reliably generates high-quality, unbiased random numbers suitable for cryptographic applications.