Clade works on atom-recoil interferometry, using Bloch-oscillation-enhanced light-pulse atom interferometers to measure the photon recoil velocity of atoms with extreme precision, from which the fine-structure constant is extracted as one of the most stringent tests of QED and the Standard Model. This precision-metrology approach is a core exemplar of atom-interferometric quantum sensing at LKB.

Guellati-Khelifa leads LKB's atom-interferometric determination of the fine-structure constant via precision measurement of the atomic recoil velocity using Bloch oscillations in an optical lattice, one of the highest-precision atom-interferometry tests of fundamental physics worldwide.