Two quantum giants are in a war or words over recent claims of quantum supremacy, according to Wired Magazine.

Las month, Google claimed in a technical paper that the search-engine giant achieved quantum supremacy in a NASA-Google collaboration. Quantum supremacy — originally conceived by Caltech professor John Preskill —  is the point at which a quantum computer can outperform a classical computer, even a classical supercomputer. In this case, Google said its quantum computer performed a computation that would take a classical computer a couple thousand years to figure out.

IBM has now countered that their Summit supercomputer — a massive, but still classical computer — could achieve that in a few days.

“This threshold has not been met,” an IBM blog post on the situation said. 

IBM suggests their supercomputer could have done that work in 2 ½ days, not millennia. With enough finagling, the Summit might be even able to do the calculation faster. That would still be slower than the time posted by Google’s Sycamore quantum chip, but, according to Wired, the concept of quantum supremacy requires a quantum challenger to do something that a classical computer could not do at all.

“We argue that an ideal simulation of the same task can be performed on a classical system in 2.5 days and with far greater fidelity. This is in fact a conservative, worst-case estimate, and we expect that with additional refinements the classical cost of the simulation can be further reduced,” the company’s researchers added in the post.

Jonathan Dowling, a professor at Louisiana State University, told Wired that IBM has a point.

“Google picked a problem they thought to be really hard on a classical machine, but IBM now has demonstrated that the problem is not as hard as Google thought it was,” he told the publication.

While it may seem like IBM is dismissing quantum supremacy, they’re not. IBM has its own quantum computing program and is making rapid progress with their own quantum computer and are — no doubt — attempting to achieve their own crack at quantum supremacy.

Google had no comment.

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