Verifying the output from a quantum computer by comparing it to the output of another quantum computer | 1/19/2020 | Staff
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A team of researchers from the University of Innsbruck and the Austrian Academy of Sciences has developed a way to verify the output from one quantum computer by comparing it to the output of another quantum computer. In their paper published in the journal Physical Review Letters, the group describes developing and testing their efficient approach to verifying quantum devices.

As computer scientists move closer to creating a truly usable quantum computer, they are faced with a new problem—how to verify its results. Verifying the results of small quantum computers with just a few qubits is straightforward—compare the results with the output from a traditional computer. In a system with more qubits, however, this approach becomes unfeasible—it requires too much traditional computing power. The whole point of quantum computing, after all, is to solve problems that are currently unsolvable by traditional computers.

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Another way to verify the results produced by one quantum computer is to compare them with the output from another quantum computer. Unfortunately, this is not as simple as it sounds due to the intrinsic randomness of quantum mechanics. Even identical quantum computers will not produce identical results. With quantum computers, it is the...
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