2024-03-192024-03-192021ASSIS, Rógerio J. de et al . Two-level quantum Otto heat engine operating with unit efficiency far from the quasi-static regime under a squeezed reservoir. Journal of Physics B: atomic, molecular and optical physics, Bristol, v. 54, n. 9, e095501, 2021. DOI: 10.1088/1361-6455/abcfd9. Disponível em: https://iopscience.iop.org/article/10.1088/1361-6455/abcfd9/meta. Acesso em: 8 mar. 2024.0953-4075e- 1361-6455https://iopscience.iop.org/article/10.1088/1361-6455/abcfd9/metaRecent theoretical and experimental studies in quantum heat engines show that, in the quasi-static regime, it is possible to have higher efficiency than the limit imposed by Carnot, provided that engineered reservoirs are used. The quasi-static regime, however, is a strong limitation to the operation of heat engines, since an infinitely long time is required to complete a cycle. In this paper we propose a two-level model as the working substance to perform a quantum Otto heat engine surrounded by a cold thermal reservoir and a squeezed hot thermal reservoir. Taking advantage of this model we show a striking achievement, that is to attain unity efficiency even at non-null power.engAcesso RestritoArtigo10.1088/1361-6455/abcfd9