  Vorticity is a key ingredient to a broad variety of fluid phenomena, and its
quantised version is considered to be the hallmark of superfluidity.
Circulating flows that correspond to vortices of a large topological charge,
termed giant vortices, are notoriously difficult to realise and even when
externally imprinted, they are unstable, breaking into many vortices of a
single charge. In spite of many theoretical proposals on the formation and
stabilisation of giant vortices in ultra-cold atomic Bose-Einstein condensates
and other superfluid systems, their experimental realisation remains elusive.
Polariton condensates stand out from other superfluid systems due to their
particularly strong interparticle interactions combined with their
non-equilibrium nature, and as such provide an alternative testbed for the
study of vortices. Here, we non-resonantly excite an odd number of polariton
condensates at the vertices of a regular polygon and we observe the formation
of a stable discrete vortex state with a large topological charge as a
consequence of antibonding frustration between nearest neighbouring
condensates.
