Ground-state cooling of a single atom inside a high-bandwidth cavity
Eduardo Uruñuela, Wolfgang Alt, Elvira Keiler, Dieter Meschede, Deepak Pandey, Hannes Pfeifer, Tobias Macha · Physical Review A · 2020
We report on vibrational ground-state cooling of a single neutral atom coupled to a high-bandwidth Fabry-P\'erot cavity. The cooling process relies on degenerate Raman sideband transitions driven by dipole trap beams, which confine the atoms in three dimensions. We infer a one-dimensional motional ground-state population close to $90%$ by means of Raman spectroscopy. Moreover, lifetime measurements of a cavity-coupled atom exceeding 40 s imply three-dimensional cooling of the atomic motion, which makes this resource-efficient technique particularly interesting for cavity experiments with limited optical access.