Electronic excitations and noise in optically adressable semiconductors and insulators

We will describe methodological developments to describe electronic excitations and noise in materials for interest in quantum technologies, in particular quantum sensing and communications. We will touch upon recent progress on spin-flip time-dependent DFT [1] and Bethe Salpeter (BSE) based methodologies [2] for optical excitations, quantum embedding approaches [3] and techniques to describe noise in closed and open quantum systems [4].