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Light-Matter-Interaction in Nanostructures: Semi-Classical and Quantum-Optical Description The interaction of light with matter is a rich and fascinating field of research. From a theoretical point of view it turns out that a single description, e.g., Maxwell's classical equations, are inapplicable for describing all electromagnetic phenomena which are expected to occur in state-of-the-art nano-photonic systems. The aim of this Ph.D. project is the application of existing and the development of new theoretical models to systems where non-classical phenomena occur. In a first step the radiation field might still be considered as a classical field whose dynamics is given by Maxwell's equations but the polarization induced inside the material is calculated by using quantum mechanics. The next level of description combines both the quantization of the radiation field and a quantum description of matter. Within these frameworks, possible investigations might include non-linear pulse propagation, saturation effects, the emission dynamics of artificial atoms in photonic crystals, few-photonquantum transport in low-dimensional systems, photon-atom bound states, (quantum)-cavityopto-mechanics, photon-photon interactions, and entanglement.