Berlin 2018 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 9: Statistical Physics far from Thermal Equilibrium
DY 9.2: Vortrag
Montag, 12. März 2018, 10:15–10:30, BH-N 334
Qubit absorption refrigerator at strong coupling — Anqui Mu1, Bijay Kumar Agarwalla2, •Gernot Schaller3, and Dvira Segal1 — 1Dept. of Chemistry, University of Toronto — 2Dept. of Physics, Indian Inst. of Science Education and Research — 3Institut f. Theoretische Physik, TU Berlin
We demonstrate that a quantum absorption refrigerator can be realized from the smallest quantum system, a qubit, by coupling it in a non-additive (strong) manner to three heat baths. This function is un-attainable for the qubit model under the weak system-bath coupling limit, when the dissipation is additive. We obtain then closed expressions for the cooling window and refrigeration efficiency, as well as bounds for the maximal cooling efficiency and the efficiency at maximal power. Our results agree with macroscopic designs and with three-level models for quantum absorption refrigerators, which are based on the weak system-bath coupling assumption. Our work demonstrates that strongly-coupled quantum machines can exhibit function that is un-attainable under the weak system-bath coupling assumption.
[1] A. Mu et al., NJP in press, arXiv:1709.02835.