A team of researchers has developed and implemented a cross-check procedure that allows the results of a calculation performed on one quantum computer to be verified through a related but fundamentally different calculation on another.
"In order to take full advantage of future quantum computers for critical calculations we need a way to ensure the output is correct, even if we cannot perform the calculation in question by other means," says Chiara Greganti from the University of Vienna.
The team describes its work in "Cross-Verification of Independent Quantum Devices," published in Physical Review X.
"We ask different quantum computers to perform different random-looking computations," says Martin Ringbauer from the University of Innsbruck. "While the results may appear random and the computations are different, there are certain outputs that must agree if the devices are working correctly."
From University of Vienna
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