• Open Access

Characterizing Phase Noise in a Gain-Switched Laser Diode for Quantum Random-Number Generation

V. Lovic, D.G. Marangon, M. Lucamarini, Z. Yuan, and A.J. Shields
Phys. Rev. Applied 16, 054012 – Published 4 November 2021

Abstract

While operating a quantum random-number generator (QRNG), it is extremely useful to have a model of the physical entropy source to guarantee that the device is delivering randomness of genuine quantum origin. In this work we consider a QRNG based on a gain-switched laser diode and we develop a model to quantify its phase noise. This model is based on the laser rate equations and the state-of-the-art techniques for the characterization of laser diodes used in lightwave systems. These tools let us achieve a faithful modeling of the phase noise and we verify its accuracy through comparisons with experimental measurements. Furthermore, the model can be used to select optimal parameters to maximize the QRNG performance and monitor the device behavior to detect malfunctioning or malicious tampering of the device.

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  • Received 11 June 2021
  • Revised 12 August 2021
  • Accepted 1 October 2021

DOI:https://doi.org/10.1103/PhysRevApplied.16.054012

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

V. Lovic1,2, D.G. Marangon1,*, M. Lucamarini1, Z. Yuan1, and A.J. Shields1

  • 1Toshiba Europe, Ltd., 208 Cambridge Science Park, Milton Road, Cambridge CB4 0GZ, United Kingdom
  • 2QOLS, Blackett Laboratory, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom

  • *Corresponding author. davide.marangon@crl.toshiba.co.uk

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Issue

Vol. 16, Iss. 5 — November 2021

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