Research Interests • Universal matter-wave interferometry with atoms, clusters, tailored molecules, biomolecules and nanoparticles. • Quantum physics at the interface to the classical world: decoherence and interferometric tests of wave function collapse. • Quantum physics at the interface to chemistry: Quantum nanorulers to measure electric, magnetic, optical and structural properties of molecules. • Quantum physics at the interface to biology: Matter-wave experiments with vitamins, antibiotics and polypeptides. • Quantum physics at the interface to mass spectrometry technologies Quantum nanowire detectors for biomolecular beams • Quantum physics at the interface to optomechanics: Optical cooling of dielectric nanospheres in high-finesse microcavities as well as rotational cooling