Quantum computing stocks like IonQ, Rigetti Computing, D-Wave Quantum, and Quantum Computing were each down by more than a whopping 40% after Nvidia chief Jensen Huang’s comments that he did not expect quantum computers to be a reality any time soon.

Quantum computing stocks are tumbling this morning after Nvidia (NVDA) CEO Jensen Huang contended yesterday that the technology would not be “very useful” for decades. Among the widely held names in the sector diving more than 30% are Rigetti Computing (RGTI),

Quantum computing companies have surged recently but Nvidia CEO Jensen Huang had a disappointing message for the sector.