The research area Quantum Metrology is under investigation within the
QUEST Institute of Experimental Quantum Metrology
at the Physikalisch Technische Bundesanstalt in Braunschweig. more
It focusses on two primary research objectives:
Direct Frequency Comb Spectroscopy using Quantum Logic (DIFCOS)
We strive to perform optical spectroscopy on atomic and molecular species with interesting spectroscopic features that have resisted precision spectroscopy in the past due to the lack of a suitable transition for laser cooling, state preparation and detection. By combining direct optical frequency comb spectroscopy techniques with quantum logic methods developed for quantum computation with trapped ions, we plan to perform absolute frequency metrology and coherent control of previously inaccessible many-level atoms and molecules that are trapped and have been cooled to the internal and external ground state. The versatility of this approach will allow us to study many different atomic and molecular species with the goal of improving current limits on fundamental constants and their temporal variation.
Ion Quantum Logic Optical Clock (iQLOC)
Techniques developed for quantum computing with trapped ions can be used to perform precision spectroscopy on ion species such as aluminum that has an ideal transition for an optical clock. In this project, we plan to set up an optical clock experiment with aluminum as the clock ion and a logic ion that provides sympathetic cooling, state preparation, and internal state detection after interrogation of the clock transition. Recent experiments indicate, that the aluminum single ion optical clock has the potential to become the best clock in the world.