  Light forces can be harnessed to levitate mesoscopic objects and cool them
down towards their motional quantum ground state. Significant roadblocks on the
way to scale up levitation from a single to multiple particles in close
proximity are the requirements to constantly monitor the particles' positions
as well as to engineer complex light fields that react fast and appropriately
to their movements. Here, we present an approach that solves both problems at
once. By exploiting the information stored in a time-dependent scattering
matrix, we introduce a robust formalism enabling the identification of
spatially modulated wavefronts, which simultaneously cool down multiple
levitated objects of arbitrary shapes. An experimental implementation is
suggested based on stroboscopic scattering-matrix measurements and
time-adaptive injections of modulated light fields.
