%0 Journal Article
%T Phonon-assisted population inversion of a single quantum dot
%A J. H. Quilter
%A A. J. Brash
%A F. Liu
%A M. Gl£¿ssl
%A A. M. Barth
%A V. M. Axt
%A A. J. Ramsay
%A M. S. Skolnick
%A A. M. Fox
%J Physics
%D 2014
%I arXiv
%X We demonstrate an approach to realize the population inversion of a single InGaAs/GaAs quantum dot, which is driven by a laser pulse tuned within the neutral exciton phonon sideband. The inversion is achieved by rapid thermalization of the optically dressed states via phonon-assisted relaxation. A maximum exciton population of 0.67 $\pm$ 0.06 is measured for a laser tuned 0.83 meV to higher energy and the phonon sideband is mapped using a two-color pump-probe technique. Our experiments reveal that, in accordance with theory, the phonon-bath provides additional functionality for an optically driven quantum dot qubit.
%U http://arxiv.org/abs/1409.0913v3