Fast thermometry for trapped ions using dark resonances

We experimentally demonstrate a method to determine the temperature of trapped ions which is suitable for monitoring fast thermalization processes. We show that observing and analyzing the lineshape of dark resonances in the fluorescence spectrum provides a temperature measurement which is accurate...

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Bibliographic Details
Published in:New journal of physics 2015-04, Vol.17 (4), p.45004
Main Authors: Roßnagel, J, Tolazzi, K N, Schmidt-Kaler, F, Singer, K
Format: Article
Language:English
Subjects:
05.70-a
coherent population trapping
Heat engines
ion cooling
Ion temperature
ion trapping
Laser cooling
Laser induced fluorescence
Nonequilibrium thermodynamics
Physics
quantum optics
Temperature
Temperature measurement
Thermalization (energy absorption)
Thermodynamic equilibrium
thermodynamics
Thermometry
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Summary:We experimentally demonstrate a method to determine the temperature of trapped ions which is suitable for monitoring fast thermalization processes. We show that observing and analyzing the lineshape of dark resonances in the fluorescence spectrum provides a temperature measurement which is accurate over a large dynamic range, applied to single ions and small ion crystals. Laser induced fluorescence is detected over a time of only , allowing for rapid determination of the ion temperature. In the measurement range of 10−1- mK we reach better than accuracy. Tuning the cooling laser to selected resonance features allows us to control the ion temperatures between mK and more than mK. Experimental work is supported by a solution of the eight-level optical Bloch equations when including the ions' classical motion. This technique paves the way for many experiments, including heat transport in ion strings, heat engines, non-equilibrium thermodynamics or thermometry of large ion crystals.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/17/4/045004