Randomness is a useful resource. Random numbers are a key ingredient in cryptography, statistical analysis, computer simulation, and (more obviously) lotteries and gambling. They could also help make fairer decisions about things like who gets selected for tax audits or jury duty, or how to redraw voting districts—but only if people are confident they are truly random. A new “randomness beacon” developed by the National Institute of Standards and Technology (NIST) and the University of Colorado Boulder could help.

The Colorado University Randomness Beacon (CURBy) exploits the inherent unpredictability of quantum mechanics to produce truly random numbers. It relies on an experiment known as a Bell test designed to probe the fundamental principles of quantum mechanics. In 2015, researchers at NIST used it to provide the most definitive proof yet of entanglement—a quantum phenomenon in which the quantum states of two particles are intrinsically linked, no matter how far apart.

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https://spectrum.ieee.org/nist-quantum-random-number-generator