Unbiased random bitstream generation using injection-locked spin-torque nano-oscillators - CEA Grenoble
Journal Articles Physical Review Applied Year : 2024

Unbiased random bitstream generation using injection-locked spin-torque nano-oscillators

Lorena Anghel
Ursula Ebels

Abstract

Unbiased sources of true randomness are critical for the successful deployment of stochastic unconventional computing schemes and encryption applications in hardware. Leveraging nanoscale thermal magnetization fluctuations provides an efficient and almost costfree means of generating truly random bitstreams, distinguishing them from predictable pseudorandom sequences. However, existing approaches that aim to achieve randomness often suffer from bias, leading to significant deviations from equal fractions of 0 and 1 in the bitstreams and compromising their inherent unpredictability. This study presents a hardware approach that capitalizes on the intrinsic balance of phase noise in an oscillator injection-locked at twice its natural frequency, leveraging the stability of this naturally balanced physical system. We demonstrate the successful generation of unbiased and truly random bitstreams through extensive experimentation. Our numerical simulations exhibit excellent agreement with the experimental results, confirming the robustness and viability of our approach.
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Dates and versions

hal-04666735 , version 1 (02-08-2024)

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Nhat-Tan Phan, Nitin Prasad, Abderrazak Hakam, Ahmed Sidi El Valli, Lorena Anghel, et al.. Unbiased random bitstream generation using injection-locked spin-torque nano-oscillators. Physical Review Applied, 2024, 21 (3), pp.034063. ⟨10.1103/PhysRevApplied.21.034063⟩. ⟨hal-04666735⟩
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