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Updated: May 14, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Ultrafast Random Number Generation Using Broadband Polarization Chaos in QD Spin-VCSELs.

Christos Tselios1, Panagiotis Georgiou2, Christina Tanya Politi1

  • 1Department of Electrical and Computer Engineering, University of Peloponnese, 22100 Patras, Greece.

Sensors (Basel, Switzerland)
|May 13, 2026
PubMed
Summary
This summary is machine-generated.

Quantum dot spin vertical-cavity surface-emitting lasers (QD spin-VCSELs) generate broadband polarization chaos for high-speed random number generation (RNG). Optimized conditions achieve 240 Gb/s RNG rates, showing promise for secure communications.

Keywords:
polarization chaospolarization dynamicsquantum-dot spin-VCSELsspin lasers

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Area of Science:

  • Optoelectronics
  • Quantum Information Science
  • Laser Physics

Background:

  • Semiconductor lasers are crucial for chaos-based information processing, offering wide chaotic bandwidths.
  • Optically injected QD spin-VCSELs exhibit polarization chaos, a phenomenon with potential for advanced applications.

Purpose of the Study:

  • Investigate broadband polarization chaos in QD spin-VCSELs for high-speed random number generation (RNG).
  • Assess the performance and quality of RNG generated from these devices.

Main Methods:

  • Utilized optically injected QD spin-VCSELs with elliptical injection to achieve broadband polarization chaos.
  • Employed post-processing techniques to optimize random number sequences.
  • Evaluated randomness using NIST SP800-90B (entropy estimation) and NIST SP800-22 (statistical test suite).

Main Results:

  • Achieved chaotic bandwidths approaching 50 GHz per polarization mode.
  • Demonstrated random number generation (RNG) at rates up to 240 Gb/s.
  • Confirmed high quality of generated random sequences through rigorous statistical analysis.

Conclusions:

  • QD spin-VCSELs are effective compact and ultrafast sources for high-speed RNG.
  • The study validates the potential of these lasers for secure communication systems.
  • Polarization chaos in QD spin-VCSELs offers a promising avenue for future cryptographic applications.