Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 64: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)
Q 64.20: Poster
Thursday, March 13, 2025, 17:00–19:00, Tent
Trapping and sympathetic cooling of Thorium ions with Calcium — •Valerii Andriushkov1,2, Yumiao Wang3, 4, Nutan Kumari Sah3, Florian Zacherl3, Ke Zhang3, Keerthan Subramanian3, Srinivasa Pradeep Arasada3, Jonas Stricker1,2,3, Dennis Renisch1,2,3, Lars von der Wense3, Christoph E. Düllmann1,2,3, Ferdinand Schmidt-Kaler3, and Dmitry Budker1,2,3,5 — 1Helmholtz Institute Mainz, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — 3Johannes Gutenberg Universität Mainz — 4Fudan University, Shanghai, China — 5Department of Physics, University of California, Berkeley, USA
The TACTICa [1] (Trapping and Cooling of Thorium Ions via Calcium) experiment aims to use ion trapping techniques for precision isotope shift measurements and to explore the nuclear structure of Th. In addition, 229Th ions can also be used as a platform for direct laser spectroscopy of its first nuclear excited state and the development of a nuclear optical clock. This work is conducted in collaboration with the NuQuant project, which recently partnered with TACTICa. Since direct laser cooling of Th ions in a Paul trap is inefficient, sympathetic cooling using calcium ions is employed. Our goal is to implement quantum logic spectroscopy on the Th+-Ca+, enabling high-precision spectroscopy of Th transition. This work is supported by the DFG Project ’TACTICa’ (grant agreement no. 495729045) and the BMBF Quantum Futur II Grant Project ’NuQuant’ (FKZ 13N16295A).
[1] K. Groot-Berning et al., Phys. Rev. A 99, 023420 (2019)
Keywords: Calcium ions; Paul trap; Thorium ions; Sympathetic cooling; Quantum logic spectroscopy