Erlangen 2022 – scientific programme

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SYQC: Symposium Quantum Cooperativity of Light and Matter

SYQC 3: Quantum Cooperativity (joint session Q/SYQC)

SYQC 3.5: 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 Hahn^2,3, Sebastian Wolf⁴, Wenbing Li^2,4, Christoph Düllmann^2,4,5, Dmitry Budker^2,4,6, and Fedinand Schmidt-Kaler^4,2 — ¹Saarland 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.