Freiburg 2024 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 11: Precision Spectroscopy of Atoms and Ions I (joint session A/Q)
A 11.8: Vortrag
Dienstag, 12. März 2024, 12:45–13:00, HS 1098
Towards high precision quantum logic spectroscopy of single molecular ions — •Maximilian Jasin Zawierucha1, Till Rehmert1, Fabian Wolf1, and Piet O. Schmidt1,2 — 1Physikalisch- Technische Bundesanstalt, Braunschweig — 2Institut für Quantenoptik, Leibniz Universität Hannover, Hannover
High precision spectroscopy of trapped molecular ions constitutes a promising tool for the study of fundamental physics. Possible applications include the search for a variation of fundamental constants and measurement of the electric dipole moment of the electron. Compared to atoms, molecules offer a rich level structure, permanent dipole moment and large internal electric fields which make them exceptionally well suited for those applications. However, the additional rotational and vibrational degrees of freedom result in a dense level structure and absence of closed cycling transitions. Therefore, standard techniques for cooling, optical pumping and state 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 is used as a bus to transfer information about the internal state of the molecular ion to the atomic ion. Using calcium as a logic ion, we have implemented a quantum logic scheme to detect population transfer on a co-trapped spectroscopy ion. The interaction is driven by a far detuned Raman laser setup. We present the latest progress of our experiment, aiming at high precision spectroscopy of molecular and complex atomic ions.
Keywords: quantum-logic; molecules; ions; spectroscopy