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DY: Fachverband Dynamik und Statistische Physik
DY 9: Statistical Physics far from Thermal Equilibrium
DY 9.3: Talk
Monday, March 12, 2018, 10:30–10:45, BH-N 334
Energy efficient quantum machines — •Obinna Abah1 and Eric Lutz2 — 1Centre for Theoretical Atomic, Molecular and Optical Physics, Queen's University Belfast, United Kingdom. — 2Department of Physics, University of Erlangen-Nuremberg, Germany.
We investigate the performance of a quantum thermal machine operating in finite time based on shortcut-to-adiabaticity techniques. We compute efficiency and power for a paradigmatic harmonic quantum Otto engine by taking the energetic cost of the shortcut driving explicitly into account. We demonstrate that shortcut-to-adiabaticity machines outperform conventional ones for fast cycles. We further derive generic upper bounds on both quantities, valid for any heat engine cycle, using the notion of quantum speed limit for driven systems. We establish that these quantum bounds are tighter than those stemming from the second law of thermodynamics.
Reference: Obinna Abah and Eric Lutz, EPL 118, 40005 (2017).