Shares of leading firms nose-dive after Nvidia’s Jensen Huang suggests a generational wait for fully functional quantum tech. We’ve been told that the future is now, but it seems it’s not quite here yet—at least not for quantum computing.

The quantum computing rally came to an abrupt end on Wednesday following comments from Nvidia CEO Jensen Huang. During a question-and-answer session with analysts, Huang put forth a more pessimistic view of the quantum computing timeline:

The carnage in quantum computing stocks Wednesday saw shares of Rigetti Computing (NASDAQ:RGTI), Quantum Computing (NASDAQ:QUBT), and IonQ (NASDAQ:IONQ) plunge 40% or more. Comments made by Nvidia (NASDAQ:NVDA) CEO Jensen Huang that the sector won’t see viability for another two decades gutted these former high-flying stocks.