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Q: Fachverband Quantenoptik und Photonik

Q 41: Poster – Quantum Technologies II & Laser Technology

Q 41.15: Poster

Mittwoch, 4. März 2026, 17:00–19:00, Philo 2. OG

Quantum characterization and control of single molecules — •Max Koppelstätter — Universität Innsbruck, Innsbruck, Austria

The QCosmo team studies quantum states and dynamics in trapped polyatomic molecular ions with quantum logic spectroscopy (QLS). This method maps molecular transitions to a co-trapped atomic logic ion, enabling robust and efficient state readout. We focus on novel spectroscopy techniques, rovibronic state preparation and control, and the possibilities and limitations of applying quantum information processing techniques to molecular ions. We have recently measured the infrared vibrational transition frequency in the OH stretch mode of a single trapped CaOH⁺ molecular ion using cat state recoil spectroscopy. This method uses cat states to amplify the detection of the recoil of a single absorbed photon via an accumulated geometric phase. We are also developing Raman QLS to enable molecular hyperfine and rotational spectroscopy and control. Ongoing work includes planning and development of a second-generation cryogenic experiment with a segmented ion trap. The segmented design enables axial control for optimal ion positioning, while the cryogenic environment suppresses quantum jumps from thermal radiation and background gas collisions, extending ion storage and coherence times. Another component currently under development is the ion-injection system, which introduces molecular ions into the cryogenic environment.

Keywords: Molecules