Research groups within the QUEST Institute for Experimental Quantum Metrology
The Quantum Logic Spectroscopy group, led by Prof. Dr. Piet Schmidt, develops and employs quantum logic schemes for precision spectroscopy of laser-cooled ions in Paul traps. The investigated species range from singly-charged metal ions over highly-charged ions to simple molecular ions. The spectroscopy is applied for fundamental tests of physics, such as a possible variation of fundamental constants, atomic and molecular physics investigations, and optical clocks for quantum metrology and chronometric leveling in geodesy.
The group Multi-Ion Clocks, led by Dr. Tanja Mehlstäubler, focusses on linear ion chains in micro-fabricated chip traps. This scalable approach allows for a significant increase in signal strength while maintaining the strong confinement of ion crystals in Paul traps.
The group Trapped-Ion Quantum Engineering (Prof. Dr. Christian Ospelkaus) develops novel techniques for control of trapped ions and for quantum logic spectroscopy. We are currently developing quantum logic cooling and state readout schemes amenable to single (anti-)protons, with the ultimate goal of a quantum logic enabled test of CPT invariance. In our second project, we are developing surface-electrode traps with integrated microwave control electrodes for applications in quantum information processing.