Parametric feedback cooling of a single atom inside an optical cavity

This paper demonstrates an efficient parametric feedback cooling of a single atom held in an intra-cavity standing wave dipole trap. In contrast to previous feedback strategies, this scheme cools the fast axial oscillation of the atom as well as the slower radial motion. In order to cool the system with this method, the modulation of the trap depth must be adjusted in amplitude and phase with respect to the atomic motion in real time to counteract it.