SAMOP 2023 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 29: Quantum Thermodynamics and Open Quantum Systems II
QI 29.5: Vortrag
Donnerstag, 9. März 2023, 15:30–15:45, B302
power output, efficiency and role of the thermodynamic limit in nonequilibrium open quantum opto-mechanical engines — •Paulo José Paulino de Souza1, Igor Lesanovsky1,2, and Federico Carollo1 — 1Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen, Germany — 2School of Physics and Astronomy and Centre for the Mathematics and Theoretical Physics of Quantum Non-Equilibrium Systems,The University of Nottingham, Nottingham, NG7 2RD, United Kingdom
Cavity systems constitute a paradigmatic setting for optomechanical energy conversion. Experiments with atoms coupled to cavity modes are typically realized in nonequilibrium conditions, described by phenomenological models which cannot be derived via a weak system-bath coupling. This makes their interpretation as quantum engines challenging. Here, we present an effective, yet fully consistent, thermodynamic description for cavity-atom optomechanical systems, which exploits their nonequilibrium nature to achieve an energetic balance in terms of the persistent heat currents. To investigate the impact of collective behavior on their performance, we derive two thermodynamic limits, related to a weak and a strong optomechanical coupling, respectively. We illustrate our ideas focussing on a time-crystal quantum engine and discuss mechanical power generation, energy-conversion efficiency, and the emergence of metastable behavior in both limits.