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Q: Fachverband Quantenoptik und Photonik
Q 63: Precision Spectroscopy of Atoms and Ions V (joint session A/Q)
Q 63.8: Talk
Thursday, March 5, 2026, 16:15–16:30, N 3
Sympathetic cooling and spectroscopy of Ca-Th ion crystal — •Valerii Andriushkov1,2,3, Ke Zhang3, Yumiao Wang3, Darius Fenner3, Keerthan Subramanian3, Florian Zacherl3, Srinivasa Pradeep Arasada3, Jonas Stricker1,2,3, Christoph E. Düllmann1,2,3, Lars von der Wense3, Ferdinand Schmidt-Kaler3, and Dmitry Budker1,2,3,4 — 1Helmholtz Institute Mainz, Mainz — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt — 3Johannes Gutenberg Universität Mainz, Mainz — 4Department of Physics, University of California, Berkeley, USA
The TACTICa (Trapping and Cooling of Thorium Ions via Calcium) and NuQuant experiments aim to use ion-trapping techniques to investigate thorium ions for fundamental research, as well as to study 229Th for the development of a nuclear clock. Thorium ions are produced using a laser-ablation ion source and loaded into a linear Paul trap, where they form a mixed-species Coulomb crystal with Ca+. The thorium ions are efficiently cooled by the co-trapped Ca+ ions. Our goal is to perform high-precision spectroscopy of thorium ions, which will be achieved with quantum logic spectroscopy. This project is supported by the DFG Project TACTICa (grant agreement no. 495729045) and the BMFTR Quantum Futur II Grant Project NuQuant (FKZ 13N16295A).
Keywords: Calcium ions; Thorium ions; Paul trap; Sympathetic cooling; Quantum logic spectroscopy