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

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

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.