Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)

Q 27.20: Poster

Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG

The superconducting resonator Paul trap: status and developments — •Ruben B. Henninger, Elwin A. Dijck, Vera M. Schäfer, Devanarayanan Rajeeb Kumar, Sebastian Davidson, K Shreya Rao, Thomas Pfeifer, and José R. Crespo López-Urrutia — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Quantum logic spectroscopy of highly charged ions (HCIs) offers sensitivity to variations of fundamental constants and tests of bound state QED in extreme fields, while offering intrinsically low polarizability and therefore suppressed resonance shifts. This makes HCIs prime candidates for next generation clocks and precision tests. In order to accomplish this, a cryogenic trap setup that integrates a linear Paul trap into a superconducting RF resonator was developed. The first generation system provides intrinsic RF filtering, magnetic self shielding, and a stable quantization field with observed Ramsey coherence times above 200ms on a B field sensitive transition. In addressing residual AC field systematics, potential control limits and retrapping robustness, a redesigned trap and resonator employ optimized electrode geometry and upgraded cryogenics and optics. We present benchmark results from the working setup and initial data from the new platform, outlining a path to increased secular frequencies and lower magnetic systematics for HCI QLS.

Keywords: Ion trap; superconducting; cryogenics; Quantum logic spectroscopy; Highly charged ions