Within QLM, multiple groups utilise the versatility of Rydberg systems. Our research ranges from Rydberg Excitons in cuprous oxide (Cu2O) to atomic Rydberg systems and Rydberg-molecule hybrid platforms. We make use of atomic Rydberg states in the divalent strontium atom for a Sr Quantum Clock, and in ultracold and hot vapours for quantum optics via non-linear light-matter interactions. Transitions between different Rydberg states are used for THz imaging in Rb and Cs vapours at room temperature. Furthermore, Rydberg atoms speed up the interaction between two adjacent molecules and, more generally, allow us to study such hybrid quantum systems. These experiments are all accompanied by corresponding theoretical research on Rydberg systems. For more details on specific projects, follow the links in the text and below.