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Q: Fachverband Quantenoptik und Photonik

Q 64: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)

Q 64.11: Poster

Donnerstag, 13. März 2025, 17:00–19:00, Tent

Spectroscopy of Titanium and Molecular Ions — •Maximilian J. Zawierucha^1,2, Till Rehmert^1,2, Piet O. Schmidt^1,2, and Fabian Wolf¹ — ¹Physikalisch-Technische Bundesanstalt — ²Leibniz Universität Hannover

Extending quantum control to increasingly complex systems is crucial for advancing quantum technologies and fundamental physics. Molecules for example offer a rich level structure, permanent dipole moment and large internal electric fields which make them exceptionally well suited for the study of fundamental physics. However, the additional degrees of freedom result in a dense level structure and absence of closed cycling transitions. Therefore, standard techniques for cooling, state preparation and detection cannot be applied. This challenge can be overcome by quantum logic spectroscopy. In addition to the single molecular ion, one well-controllable atomic ion is co-trapped, coupling strongly to the molecule via the Coulomb interaction. The shared motional state can be used as a bus to transfer information about the internal state of the molecular ion to the atomic ion, where it can be read out using fluorescence detection. Using a far detuned Raman laser and Ca⁺ as a logic ion, we have implemented a quantum logic scheme for coherent manipulation of Zeeman states in the a⁴F ground state of titanium ions. With this we are able to determine the ion’s finestructure state, prepare a Zeeman edge-state and precisely measure the g-factors of titanium. The developed techniques are applicable to a wide range of complex ionic systems and are currently being transferred to enable control over MgH⁺ molecular ions.

Keywords: Trapped ions; Molecular ions; Spectroscopy; Titanium; Quantum Logic