  Kagome lattices supporting Dirac cone and flatband dispersions are well known
as a highly frustrated, two-dimensional lattice system. Particularly the
flatbands therein are attracting continuous interest based on their link to
topological order, correlations and frustration. In this work, we realize
coupled microcavity implementations of Kagome lattices hosting
exciton-polariton quantum fluids of light. We demonstrate precise control over
the dispersiveness of the flatband as well as selective condensation of
exciton-polaritons into the flatband. Subsequently, we focus on the spatial and
temporal coherence properties of the laser-like emission from these polariton
condensates that are closely connected to the flatband nature of the system.
Notably, we find a drastic increase in coherence time due to the localization
of flatband condensates. Our work illustrates the outstanding suitability of
the exciton-polariton system for detailed studies of flatband states as a
platform for microlaser arrays in compact localized states, including strong
interactions, topology and non-linearity.
