Questions about fairness and transparency frequently arise when people play digital slot-style games. Random number generators, or RNGs, are central to how these games function and influence outcomes.

Researchers used two quantum devices and a math trick to ensure that newly generated “random” numbers are truly unpredictable.

RANDOMNESS IS A valuable commodity. Computer models of complex systems ranging from the weather to the stockmarket are voracious consumers of random numbers. Cryptography, too, relies heavily on ...