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50-Gbit/s Quantum Random Number Delivery over Fiber with a Real-time Spatially Multiplexed QRNG

Ken Tanizawa, Kentaro Kato, Fumio Futami

Published Jan 1, 2026• 0 citations
Publisher

Abstract

We analyze low-power operation of a 50-Gbit/s spatially multiplexed quantum random number generator based on vacuum fluctuations and demonstrate secure unpredictable random number generation at a 4-km fiber distance from a laser source.
DOI
10.1364/cleo_at.2026.am4c.1

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Fast secure random number generation is essential for high-speed encrypted communication, and is the backbone of information security. Generation of truly random numbers depends on the intrinsic randomness of the process used and is usually limited by electronic bandwidth and signal processing data rates. Here we use a multiplexing scheme to create a fast quantum random number generator structurally tailored to encryption for distributed computing, and high bit-rate data transfer. We use vacuum fluctuations measured by seven homodyne detectors as quantum randomness sources, multiplexed using a single integrated optical device. We obtain a real-time random number generation rate of 3.08 Gbit/s, from only 27.5 MHz of sampled detector bandwidth. Furthermore, we take advantage of the multiplexed nature of our system to demonstrate an unseeded strong extractor with a generation rate of 26 Mbit/s.