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• W3089378387 abstract "We study the optimization of the performance of arbitrary periodically driven thermal machines. Within the assumption of fast modulation of the driving parameters, we derive the optimal cycle that universally maximizes the extracted power of heat engines, the cooling power of refrigerators, and in general any linear combination of the heat currents. We denote this optimal solution as ``generalized Otto cycle'' since it shares the basic structure with the standard Otto cycle, but it is characterized by a greater number of fast strokes. We bound this number in terms of the dimension of the Hilbert space of the system used as working fluid. The generality of these results allows for a widespread range of applications, such as reducing the computational complexity for numerical approaches, or obtaining the explicit form of the optimal protocols when the system-baths interactions are characterized by a single thermalization scale. In this case, we compare the thermodynamic performance of a collection of optimally driven noninteracting and interacting qubits. Remarkably, for refrigerators the noninteracting qubits perform almost as well as the interacting ones, while in the heat engine case there is a many-body advantage both in the maximum power, and in the efficiency at maximum power. Additionally, we illustrate our general results studying the paradigmatic model of a qutrit-based heat engine. Our results strictly hold in the semiclassical case in which no coherence is generated by the driving, and finally we discuss the noncommuting case." @default.
• W3089378387 created "2020-10-08" @default.
• W3089378387 creator A5013241249 @default.
• W3089378387 creator A5025356866 @default.
• W3089378387 creator A5053914492 @default.
• W3089378387 creator A5073623168 @default.
• W3089378387 creator A5082938399 @default.
• W3089378387 date "2021-09-30" @default.
• W3089378387 modified "2023-10-17" @default.
• W3089378387 title "Maximum-power heat engines and refrigerators in the fast-driving regime" @default.
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