Casino bosses, take note: Physicists have described a way to guarantee complete randomness in a flow of information, such as the numbers generated by a roulette wheel.
The work could allow a person to transform a stream of not-quite-random information into a totally random one. “Even if you don’t have perfect randomness, you can make perfect randomness,” says Roger Colbeck, a theoretical physicist at ETH Zurich in Switzerland.
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