Quantum computing stocks are having a tumultuous week, but one fund manager says investors should focus on the long game when it comes to the sector. Earlier this week, quantum computing stocks broadly slid after Nvidia CEO Jensen Huang said “very useful quantum computers” were decades away.

CEO Jensen Huang said that “very useful quantum computers” are likely 20 years away. The commentary from the tech executive caused an immediate negative reaction in quantum computing stocks, sending popular names like IonQ (IONQ) and Rigetti Computing (RGTI) down between 40% and 50% on Jan.