Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 43: Cold atoms VII - micromachines (joint session A/Q)
A 43.1: Gruppenbericht
Freitag, 9. März 2018, 10:30–10:50, K 0.011
Thermodynamics of single-ion machines — •Ulrich Poschinger1, David von Lindenfels1, Oliver Gräb1, Martin Wagener1, Vidyut Kaushal1, Jonas Schulz1, Alexander Friedenberger2, Eric Lutz2, and Ferdinand Schmidt-Kaler1 — 1QUANTUM, Institut für Physik, Universität Mainz, D-55128 Mainz, Germany — 2Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany
The thermodynamic behaviour of small machines, ultimately far from the thermodynamic limit, is currently attracting much interest. We present the realization of a single-ion ’heat engine’ [1]. The working medium is the spin degree of freedom of a single 40Ca+ ion, positioned in an optical standing optical wave[2], which couples the spin to the ion motion. The ion is subjected to alternating optical pumping pulses. This gives rise to an effective resonant force mediated by the standing wave, which leads to the onset of oscillations of the ion position, ranging from the motional ground state to some tens of motional quanta. We analyze the work fluctuations occuring while the thermal energy from the laser reservoirs is transferred to the ion motion, and quantify the extractable work.
We also present ongoing work on the experimental study of the performance of an autonomous single-ion ’wall-clock’, which is, according to recent theoretical work[3], tied to its waste heat production.
[1] Rossnagel et al., Science 352, 325 (2016)
[2] Schmiegelow et al., PRL 116, 033002 (2016)
[3] Erker et al., PRX 7, 031022 (2017)