The main research area of the Bratschitsch group is ultrafast quantum optics with solid-state nanosystems. Our goal is to investigate and exploit ultrafast processes on the nanoscale. We study robust nanoscopic light emitters based on semiconductor quantum structures or defect centers in diamond. To increase the interaction of light with these nano-objects we use dielectric and metallic nanostructures. In addition to these investigations we work in the field of ultrafast spintronics, magnetism, and magneto-plasmonics.