For all that computers can do, they’re useless when they’re not running. That’s not the case for quantum computers. Using a rudimentary quantum computer, a team of physicists consistently determined which of two operations the computer would have performed, even though it didn’t actually perform them.
The experiment, reported in the Aug. 21 Physical Review Letters, delivered an unprecedented 85 percent success rate for what’s called counterfactual computation: exploiting quantum mechanics to glean the information a computer would have provided had it run.
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