X0206 3 2024-03-21 1 0001816431 Quantum-Si Inc QSI 0002016312 Dowdy Paula C/O QUANTUM-SI INCORPORATED 29 BUSINESS PARK DRIVE BRANFORD CT 06405 true No securities are beneficially owned. Exhibit 24.1 - Power of Attorney /s/ Christian LaPointe, Ph.D., Attorney-in-Fact 2024-03-25