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Q: Fachverband Quantenoptik und Photonik

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

Q 27.16: Poster

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

Towards a Quantum Logic Clock for Precision Spectroscopy of Highly Charged Heavy Ions — •Nadine Homburg^1,2,3, Lukas Kau^1,2,3, Hiroshi Hayakawa^1,2,3, Zoran Andelkovic², Thomas Stöhlker^1,2,3,4, and Peter Micke^1,2,3,4 — ¹Helmholtz Institute Jena — ²GSI Helmholtz Centre for Heavy Ion Research, Darmstadt — ³Friedrich Schiller University Jena — ⁴Abbe Center of Photonics, Jena

Quantum logic spectroscopy (QLS) has driven significant advances in optical frequency metrology by enabling optical clocks based on ions that lack direct laser cooling and state detection transitions. Heavy highly charged ions (HCIs) offer optical transitions with strongly suppressed systematic shifts and enhanced sensitivity to fundamental physics. Substantial progress on medium-mass HCIs has been demonstrated, but extending QLS to the heaviest HCIs remains an open challenge. In this contribution, we present our experimental setup for QLS on heavy HCIs, specifically targeting the optical hyperfine-structure transition in ²⁰⁷Pb⁸¹⁺ at 1019.7 nm. The experiment, located at GSI in Darmstadt, will provide suitable cryogenic trapping conditions for such extreme charge states. A monolithic linear Paul trap is under development for reduced excess micromotion and trap-related systematic effects. Additionally, the setup includes laser systems for in-situ production of the logic ion Be⁺, laser cooling to the motional ground state, and coherent manipulation of qubit and HCI clock transitions.

Keywords: Highly Charged Ions; Quantum Logic Spectroscopy; Optical Clocks; Paul Trap; Ion Trap