Quantum computing stocks sold off Monday after Meta Platforms CEO Mark Zuckerberg cautioned that uses for computers with these capabilities remain years away. The comments reinforce recent commentary from Nvidia CEO Jensen Huang that suggested that the computers are likely 15 to 30 years away.

D-Wave, Rigetti Computing and Quantum Computing shares are now down by more than half on the year after critical commentary from tech executives.

Quantum-computing stocks tumbled Monday following comments from Meta Platforms CEO Mark Zuckerberg that quantum is far from from being a “practical paradigm.” Shares of D-Wave Quantum and Rigetti Computing fell 23% and 16%,

Quantum computing stocks are plunging again after another major tech leader cast doubts on the technology’s usefulness in the near future.

CEO Mark Zuckerberg’s recent comments about quantum computing’s timeline sent shockwaves through the industry’s pure-play stocks. But for investors with a sizeable risk appetite, the selloff in quantum computing names like Quantum Computing (QUBT),