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Optical Fiber Communication Conference

High-Speed On-Chip Real-Time QRNG

Cédric Bruynsteen, Axl Bomhals, Sarah Bastiaens, Ali Al Hadi Amhaz, Siebe Arnout, Xin Liang Yin

Published Jan 1, 2025• 0 citations
Publisher

Abstract

Quantum random number generators harness the inherent unpredictability of quantum entropy sources to produce truly random numbers. This talk explores how integration enables high-speed, real-time generation of these numbers for use in secure communication.
DOI
10.1364/ofc.2025.th3i.6

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Quantum random-number generators (QRNGs) produce true random numbers, which are guaranteed by the fundamental principles of quantum physics. Miniaturization of QRNGs is crucial for a wide range of communication and cryptography applications. Here, we first report a fully functional QRNG chip based on vacuum-state fluctuations, with dimensions of $16.6\ifmmode\times\else\texttimes\fi{}7.8\phantom{\rule{0.2em}{0ex}}{\mathrm{mm}}^{2}$. The quantum entropy source, which is achieved via hybrid photonic integration with an SiO2{\mathrm{Si}\mathrm{O}}_{2}SiO2​ waveguide, generates raw quantum random numbers. The hybrid photonic and electrical components are assembled into a compact ceramic package using system-in-package technology. A microcontroller unit acquires the raw data and outputs the processed quantum random numbers via a serial peripheral interface. According to the characterization results, the QRNG chip achieves a constant real-time output rate of 5.2 Mbps across the industrial temperature range of $\ensuremath{-}40$ to $85{\phantom{\rule{0.1em}{0ex}}}^{\ensuremath{\circ}}\mathrm{C}$, making it suitable for practical applications.