SAMOP 2021 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 16: Ultra-cold atoms, ions, and BEC (joint session A/Q)
A 16.6: Poster
Mittwoch, 22. September 2021, 16:30–18:30, P
A quantum heat engine driven by atomic collisions — •Sabrina Burgardt1, Quentin Bouton1, Jens Nettersheim1, Daniel Adam1, Eric Lutz2, and Artur Widera1 — 1Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, Germany. — 2Institute for Theoretical Physics I, University of Stuttgart, Stuttgart, Germany.
Quantum heat engines are subjected to quantum fluctuations related to their discrete energy spectra. Such fluctuations question the reliable operation of thermal machines in the quantum regime. Here, we realize an endoreversible quantum Otto cycle in the large quasi-spin states of Cesium impurities immersed in an ultracold Rubidium bath.
We employ quantum control to regulate the direction of heat transfer that occurs via inelastic spinexchange collisions. We further use full-counting statistics of individual atoms to monitor quantized heat exchange between engine and bath at the level of single quanta, and additionally evaluate average and variance of the power output. We optimize the performance as well as the stability of the quantum heat engine, achieving high efficiency, large power output and small power output fluctuations.