  The availability of efficient photon sources with specific properties is
important for quantum-technological applications. However, the realization of
such photon sources is often challenging and hence alternative perspectives
that suggest new means to enhance desired properties while suppressing
detrimental processes are valuable. In this work we highlight that ab-initio
simulations of coupled light-matter systems can provide such new avenues. We
show for a simple model of a quantum ring that by treating light and matter on
equal footing we can create and enhance novel pathways for down-conversion
processes. By changing the matter subsystem as well as the photonic environment
in experimentally feasible ways, we can engineer hybrid light-matter states
that enhance at the same time the efficiency of the down-conversion process and
the non-classicality of the created photons. Furthermore we show that this also
leads to a faster down-conversion, potentially avoiding detrimental decoherence
effects.
