Franck Pereira dos Santos (CNRS DR, SYRTE) develops dual-species (Rb/Cs) atom interferometers and gravimeters with the highest accuracy. Research: (1) cold-atom gravimeters for absolute gravity measurement; (2) dual Rb/Cs fountain for equivalence principle tests; (3) interleaved interferometry to eliminate dead-time and aliasing noise; (4) quantum optimal control for Raman/Bragg pulse sequences. Key SYRTE inertial sensor PI.