IBM questions the performance of D-Wave's quantum computer

IBM charges that a D-Wave quantum computer run by Google actually relies on good old-fashioned classical physics

By , IDG News Service |  

Researchers at IBM and the University of California are questioning whether a closely watched experimental computer used by Google actually relies on quantum mechanics as its manufacturer, D-Wave, claims.

At the heart of the battle is a question about the validity of quantum computing, which some predict may offer a road forward after Intel and other chip manufacturers exhaust "and reach the physical limits" of how powerful they can make their processors.

D-Wave claims it does. D-Wave charges that the IBM and university researchers confined their study to only one aspect of what its computer can do.

"A successful theory needs to explain all the existing experimental results, not just a narrowly selected subset of them," said Colin Williams, the business development director for D-Wave, of the researchers' work. "The right theory has to explain all of the data, not just some of the data."

D-Wave is a closely watched company in that it is perhaps the most advanced in terms of commercializing quantum computing, though even its founders acknowledge that they exploit only a subset of quantum mechanics, called quantum annealing.

Quantum computing is the practice of harnessing the laws of quantum mechanics, or how matter behaves at the subatomic level. Advocates claim quantum computing could be more powerful than standard silicon processing in that its small scale of operations can simulate problems too large to be represented in traditional computing systems.

D-Wave markets its machines, which it started selling in 2011, as very large co-processors, handy for solving complex optimization and machine-learning problems that could overwhelm classically designed computers. Google has invested in one of D-Wave's computers and is evaluating the results.

The researchers, from the IBM T.J. Watson Research Center and from the University of California, developed a model showing that, for a given problem solved by a D-Wave computer, a similar level of computation could be achieved through equipment that relied on classical mechanics. They used actual results from a problem solved on Google's D-Wave computer.

The researchers' paper kick-started debate over the validity of D-Wave's computer in a number of online forums.

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