Power maximization of two-stroke quantum thermal machines
- URL: http://arxiv.org/abs/2010.03489v2
- Date: Wed, 31 Mar 2021 17:08:42 GMT
- Title: Power maximization of two-stroke quantum thermal machines
- Authors: Nicol\`o Piccione, Gabriele De Chiara, Bruno Bellomo
- Abstract summary: We study two types of two-stroke cycles where two collections of identical quantum systems are initially prepared at thermal equilibrium.
In both cycles, the power peaks of qubit systems can surpass the Curzon-Ahlborn efficiency.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We present a detailed study of quantum thermal machines employing quantum
systems as working substances. In particular, we study two different types of
two-stroke cycles where two collections of identical quantum systems with
evenly spaced energy levels are initially prepared at thermal equilibrium by
putting them in contact with a cold and a hot thermal bath, respectively. The
two cycles differ in the absence or the presence of a mediator system, while,
in both cases, non-resonant exchange Hamiltonians are exploited as particle
interactions. We show that the efficiencies of these machines depend only on
the energy gaps of the systems composing the collections and are equal to the
efficiency of "equivalent" Otto cycles. Focusing on the cases of qubits or
harmonic oscillators for both models, we maximize the engine power and analyze,
in the model without the mediator, the role of the waiting time between
subsequent interactions. It turns out that the case with the mediator can bring
performance advantages when the interaction times are comparable with the
waiting time of the correspondent cycle without the mediator. We find that in
both cycles, the power peaks of qubit systems can surpass the Curzon-Ahlborn
efficiency. Finally, we compare our cycle without the mediator with previous
schemes of the quantum Otto cycle showing that high coupling is not required to
achieve the same maximum power.
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