Exploiting positive work and efficiency of quantum Otto engine based on two coupled two-level atomic systems: Local vs global approach
Sign Up to like & getrecommendations! Published in 2025 at "Journal of Applied Physics"
DOI: 10.1063/5.0287732
Abstract: We developed a model of a quantum Otto engine using two dipole-coupled two-level atoms. Based on the platform, we focus on fundamental thermodynamic quantities, including heat absorption, release to heat baths, work done, and efficiency.… read more here.
Keywords: two level; efficiency; coupled two; quantum otto ... See more keywords
Universal principles for sudden-quench quantum Otto engines.
Sign Up to like & getrecommendations! Published in 2025 at "Physical review. E"
DOI: 10.1103/h1mn-th94
Abstract: We apply a simple sudden-quench approximation for the unitary work strokes of a quantum Otto engine in order to provide a general analysis of its performance, applicable to arbitrary quantum models with two-body interactions. This… read more here.
Keywords: body; quantum otto; engine; sudden quench ... See more keywords
Quantum Otto cycle in a superconducting cavity in the nonadiabatic regime
Sign Up to like & getrecommendations! Published in 2022 at "Physical Review A"
DOI: 10.1103/physreva.105.022202
Abstract: Nicolás F. Del Grosso, Fernando C. Lombardo, Francisco D. Mazzitelli, and Paula I. Villar 1 Departamento de F́ısica Juan José Giambiagi, FCEyN UBA and IFIBA CONICET-UBA, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellón… read more here.
Keywords: cycle superconducting; nonadiabatic regime; otto cycle; superconducting cavity ... See more keywords
Nonadiabatic single-qubit quantum Otto engine
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review B"
DOI: 10.1103/physrevb.101.054513
Abstract: According to Clausius formulation of the second law of thermodynamics, for any thermal machine withdrawing heats ${Q}_{1,2}$ from two heat reservoirs at temperatures ${T}_{1,2}$, it holds that ${Q}_{1}/{T}_{1}+{Q}_{2}/{T}_{2}\ensuremath{\le}0$. Combined with the observation that the quantity… read more here.
Keywords: nonadiabatic single; single qubit; otto engine; quantum otto ... See more keywords
Collective performance of a finite-time quantum Otto cycle.
Sign Up to like & getrecommendations! Published in 2019 at "Physical review. E"
DOI: 10.1103/physreve.100.042126
Abstract: We study the finite-time effects in a quantum Otto cycle where a collective spin system is used as the working fluid. Starting from a simple one-qubit system we analyze the transition to the limit cycle… read more here.
Keywords: finite time; time; otto cycle; performance ... See more keywords
Universal two-level quantum Otto machine under a squeezed reservoir.
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review E"
DOI: 10.1103/physreve.102.052131
Abstract: We study an Otto heat machine whose working substance is a single two-level system interacting with a cold thermal reservoir and with a squeezed hot thermal reservoir. By adjusting the squeezing or the adiabaticity parameter… read more here.
Keywords: level quantum; machine; two level; quantum otto ... See more keywords
Optimization of asymmetric quantum Otto engine cycles.
Sign Up to like & getrecommendations! Published in 2022 at "Physical review. E"
DOI: 10.1103/physreve.106.024123
Abstract: We consider the optimization of the work output and fluctuations of a finite-time quantum Otto heat engine cycle consisting of compression and expansion work strokes of unequal duration. The asymmetry of the cycle is characterized… read more here.
Keywords: quantum otto; asymmetric quantum; work output; engine ... See more keywords
Quantum Otto cycle under strong coupling.
Sign Up to like & getrecommendations! Published in 2022 at "Physical review. E"
DOI: 10.1103/physreve.107.044127
Abstract: Quantum heat engines are often discussed under the weak-coupling assumption that the interaction between the system and the reservoirs is negligible. Although this setup is easier to analyze, this assumption cannot be justified on the… read more here.
Keywords: interaction; quantum otto; proposed model; weak coupling ... See more keywords
The Quantum Friction and Optimal Finite-Time Performance of the Quantum Otto Cycle
Sign Up to like & getrecommendations! Published in 2020 at "Entropy"
DOI: 10.3390/e22091060
Abstract: In this work we considered the quantum Otto cycle within an optimization framework. The goal was maximizing the power for a heat engine or maximizing the cooling power for a refrigerator. In the field of… read more here.
Keywords: finite time; quantum; quantum otto; otto cycle ... See more keywords
Quantum Otto Heat Engine Using Polar Molecules in Pendular States
Sign Up to like & getrecommendations! Published in 2024 at "Molecules"
DOI: 10.3390/molecules29235617
Abstract: Quantum heat engines (QHEs) are established by applying the principles of quantum thermodynamics to small−scale systems, which leverage quantum effects to gain certain advantages. In this study, we investigate the quantum Otto cycle by employing… read more here.
Keywords: otto heat; quantum otto; polar molecules; heat engine ... See more keywords