D-Wave Quantum (QBTS) Chief Executive Alan Baratz said Wednesday that Nvidia CEO Jensen Huang is "dead wrong" about how long it will take before quantum computers are commercially viable, CNBC reported.

"The reason he's wrong is that we at D-Wave are commercial today," Baratz told CNBC in an interview.

Huang said during an analyst Q&A session Tuesday that it will be 15 years at the earliest before "very useful quantum computers" are available, and could be as long as 30 years.

Baratz disagreed with Huang's assessment by saying that various companies are already using D-Wave Quantum's quantum computers. "Not 30 years from now, not 20 years from now, not 15 years from now," Baratz told CNBC. "But right now today."

Shares of D-Wave Quantum fell 36% during Wednesday's trading session, but rose 6.4% in after hours activity.

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