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Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 68: Quantum Cooperativity (joint session Q/SYQC)

Q 68.5: Talk

Friday, March 18, 2022, 11:30–11:45, Q-H15

Measuring the temperature of laser-cooled ions via resonance fluorescence — •Marvin Gajewski1, Giovanna Morigi1, Walther Hahn2,3, Sebastian Wolf4, Wenbing Li2,4, Christoph Düllmann2,4,5, Dmitry Budker2,4,6, and Fedinand Schmidt-Kaler4,21Saarland University, Saarbrücken, Germany — 2Helmholtz-Institut, Mainz, Germany — 3IQOQI, Innsbruck, Austria — 4Johannes Gutenberg-Universität, Mainz, Germany — 5GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — 6University of California, Berkeley, USA

The fluorescence light emitted by atoms and ions carries information about their mechanical motion. We show how the temperature of an ion crystal could be inferred from the resonance fluorescence: By means of a theoretical formalism we identify the optimal conditions on saturation and detuning at which this thermometry is most efficient. We then argue that this theory is not only relevant for experimental identification of intruder ions traversing or captured in a large ion crystal, but also for investigating the heat capacity of such mesoscopic systems.

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