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loginLet a computer smear—with the right kind of quantum randomness—and youcreate, in effect, a ‘parallel’ machine with an astronomicalnumber of processors . . . Allyou have to do is be sure that when you collapse the system, youchoose the versionthat happened to find the needle in the mathematical haystack.”—FromQuarantine[31], a 1992 science-fiction novel by Greg Egan