IBM challenges a recent result in quantum computing
Technically, they are right. Practically, it makes little difference
IT WAS HAILED by many, including The Economist, as a landmark result in quantum computing. In September a scientific paper appeared accidentally on a NASA webpage. In it a team of researchers at Google described how they had used a quantum computer to complete, in three minutes, a calculation that would have taken a classical machine 10,000 years to crunch through. This feat, they claimed, marked the first demonstration of “quantum supremacy”—using a quantum computer to tackle a task unfeasible for a classical one.
On October 23rd the paper reappeared, intentionally this time, in Nature. But a few days before that some researchers at IBM—which, like Google and several other information-technology firms, including Intel and Microsoft, is also conducting quantum-computing research—posted their own paper to arXiv, an online repository. In it, they cast doubt on Google’s claim.
This article appeared in the Science & technology section of the print edition under the headline "Not so fast"
Science & technology November 2nd 2019
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