SKM 2023 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 25: Many-Body Quantum Dynamics (joint session DY/TT)
DY 25.3: Vortrag
Mittwoch, 29. März 2023, 10:15–10:30, MOL 213
Performance boost of a collective qutrit refrigerator — •Dmytro Kolisnyk1 and Gernot Schaller2 — 1Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany — 2Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
A single qutrit with transitions selectively driven by weakly-coupled reservoirs can implement one of the world’s smallest refrigerators. We analyze the performance of N such fridges that are collectively coupled to the reservoirs. We observe a quantum boost, manifest in a quadratic scaling of the steady-state cooling current with N. As N grows further, the scaling reduces to linear, since the transitions responsible for the quantum boost become energetically unfavorable. Fine-tuned inter-qutrit interactions may be used to maintain the quantum boost for all N and also for not-perfectly collective scenarios.
[1] D. Kolisnyk and G. Schaller, Performance boost of a collective qutrit refrigerator, arXiv:2210.07844.
[2] M. Kloc, K. Meier, K. Hadjikyriakos, and G. Schaller, Superradiant Many-Qubit Absorption Refrigerator, Phys. Rev. Applied 16, 044061 (2021).
[3] N. Linden, S. Popescu, and P. Skrzypczyk. How small can thermal machines be? The smallest possible refrigerator. Phys. Rev. Lett. 105:130401, 2010.