A quantum heat engine driven by atomic collisions
| Autor: | Artur Widera, Sabrina Burgardt, Quentin Bouton, Jens Nettersheim, Eric Lutz, Daniel Adam |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Science
Quantum physics General Physics and Astronomy 01 natural sciences General Biochemistry Genetics and Molecular Biology Article 010305 fluids & plasmas 0103 physical sciences Thermal Heat exchanger 010306 general physics Quantum Ultracold gases Quantum fluctuation Heat engine Physics Multidisciplinary Thermal contact General Chemistry Mechanics Nanoscale devices Heat transfer Thermodynamics Otto cycle |
| Zdroj: | Nature Communications Nature Communications, Vol 12, Iss 1, Pp 1-7 (2021) |
| DOI: | 10.18419/opus-13059 |
| Popis: | 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. Deutsche Forschungsgemeinschaft Projekt DEAL |
| Databáze: | OpenAIRE |
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