An endoreversible quantum heat engine driven by atomic collisions

• URL: http://arxiv.org/abs/2009.10946v1
• Date: Wed, 23 Sep 2020 06:32:04 GMT
• Title: An endoreversible quantum heat engine driven by atomic collisions
• Authors: Quentin Bouton and Jens Nettersheim and Sabrina Burgardt and Daniel Adam and Eric Lutz and Artur Widera
• Abstract summary: 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 over both machine and bath to suppress internal dissipation and regulate the direction of heat transfer. We optimize the performance as well as the stability of the quantum engine, achieving high efficiency, large power output and small power output fluctuations.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum heat engines are subjected to quantum fluctuations related to their discrete energy spectra. Such fluctuations question the reliable operation of quantum engines in the microscopic realm. We here 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 over both machine and bath to suppress internal dissipation and regulate the direction of heat transfer that occurs via inelastic spin-exchange collisions. We additionally use full-counting statistics of individual atoms to monitor heat exchange between engine and bath at the level of single quanta, and evaluate average and variance of the power output. We optimize the performance as well as the stability of the quantum engine, achieving high efficiency, large power output and small power output fluctuations.

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