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Authors: Bouton, Quentin
Nettersheim, Jens
Burgardt, Sabrina
Adam, Daniel
Lutz, Eric
Widera, Artur
Title: A quantum heat engine driven by atomic collisions
Issue Date: 2021 Zeitschriftenartikel 7 Nature communications 12 (2021), No. 2063
ISSN: 2041-1723
Abstract: 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. Endoreversible machines are internally reversible and irreversible losses only occur via thermal contact. We employ quantum control to regulate the direction of heat transfer that occurs via inelastic spin-exchange 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.
Appears in Collections:08 Fakultät Mathematik und Physik

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