This thesis aims to develop new theoretical and computational tools to model light–matter interactions in nanophotonic systems while fully accounting for dissipation, which is unavoidable in real devices but remains difficult to describe in conventional quantum approaches. It will rely on a non-Hermitian formalism based on quasinormal mode theory to investigate resonant interactions between photonic or plasmonic resonators and quantum emitters. The goal is to provide a more realistic and physically transparent framework for the design of future nanophotonic and quantum technologies, including single-photon sources, quantum sensors, and strongly coupled light–matter systems.

A detailed description of the position is attached; it includes the application requirements and guidelines.