Cooling the motion of a trapped atom with a cavity field

TL;DR

This paper presents a theoretical analysis of cooling a trapped atom's motion using a high-finesse optical resonator, identifying optimal parameters and potential efficiency improvements via interference effects.

Contribution

It introduces a novel theoretical framework for cavity-assisted cooling of trapped atoms, highlighting regimes for ground state cooling and interference-enhanced efficiency.

Findings

Cooling into the ground state is achievable in specific parameter regimes.

Interference effects mediated by atomic transitions can improve cooling efficiency.

Comparison with previous laser-driven cavity cooling shows distinct advantages.

Abstract

We theoretically analyze the cooling dynamics of an atom which is tightly trapped inside a high-finesse optical resonator. Cooling is achieved by suitably tailored scattering processes, in which the atomic dipole transition either scatters a cavity photon into the electromagnetic field external to the resonator, or performs a stimulated emission into the cavity mode, which then dissipates via the cavity mirrors. We identify the parameter regimes in which the atom center-of-mass motion can be cooled into the ground state of the external trap. We predict, in particular, that for high cooperativities interference effects mediated by the atomic transition may lead to higher efficiencies. The dynamics is compared with the cooling dynamics of a trapped atom inside a resonator studied in [Phys. Rev. Lett. 95, 143001, (2005)] where the atom, instead of the cavity, is driven by a laser field.