Quantum computing stocks were red-hot recently, but Jensen Huang just offered optimistic investors a reality check.

Several stocks across the quantum computing industry fell sharply Wednesday after Nvidia CEO Jensen Huang said the technology is likely still years away.

Shares of quantum computing company IonQ ( IONQ 5.48%) raced higher this week. The stock was up by 28.5% as of Friday morning, according to data provided by S&P Global Market Intelligence.

Quantum computing is still early, experts say. Finding early stock winners is easier than crunching calculations.

For the last few months, a technology known as quantum computing has started receiving a lot of attention. As is often the case when new subject matter enters the spotlight, people try to figure out how to invest in this technology,