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

Quantum computing may be many years out, but even the founder and CEO of Nvidia now seems to think: “Why wait?” Quantum computing stocks jumped Wednesday following an announcement from Nvidia that it would add a “Quantum Day” event to its GTC conference in March.

Stocks and ETFs tied to quantum computing rose significantly Wednesday after Nvidia and Microsoft highlighted the industry's enormous potential.