Hannover 2020 – wissenschaftliches Programm
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SYCM: Symposium Hot topics in cold molecules: From laser cooling to quantum resonances
SYCM 1: Hot topics in cold molecules: From laser cooling to quantum resonances
SYCM 1.4: Hauptvortrag
Freitag, 13. März 2020, 12:30–13:00, e415
Quantum-non-demolition state detection and spectroscopy of single cold molecular ions in traps — •Stefan Willitsch — Departement Chemie, Universität Basel, Klingelbergstrasse 80, 4056 Basel, Schweiz
Trapped atoms and ions are among the best controlled quantum systems which find widespread applications in quantum science. For molecules, a similar degree of control is currently lacking owing to their complex energy-level structure. Quantum-logic protocols in which atomic ions serve as probes for molecular ions are a promising route for achieving this aim, especially with homonuclear species that decouple from black-body radiation. In this talk, a quantum-non-demolition protocol on single trapped N2+ molecules is presented which enables the detection of the spin-rovibronic state of the molecule with more than 99% fidelity. The protocol is based on the state-dependent coherent motional excitation of the cold molecular ion and the subsequent detection of the motion by a co-trapped atomic ion. Utilising this scheme, we also demonstrate the measurement of spectroscopic transitions within the molecule without the need to destroy the initial molecular quantum state. The present method lays the foundations for new, non-invasive approaches to molecular spectroscopy, for studies of state-to-state chemistry on the single-particle level and for the implementation of molecular qubits.