Nonadiabatic coupled-qubit Otto cycle with bidirectional operation and efficiency gains

Abstract

We study a quantum Otto cycle that uses a 2-qubit working substance whose Hamiltonian does not commute with itself at different times during unitary strokes. We investigate how the cycle responds to the loss of quantum adiabaticity when these strokes are operated with a finite duration. We find that qualitative features such as the possibility of counter-rotating cycles operating as heat engines, or a cycle efficiency that can increase with a decrease in the temperature difference between the baths, are resilient even to highly nonadiabatic strokes. However, cycle efficiency rapidly decreases, although it can still remain above the standard Otto value for small degrees of quantum nonadiabaticity.

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Cited by in corpus (5)

• Enhancing the performance of coupled quantum Otto thermal machines without entanglement and quantum correlations
• Measurement-based quantum Otto engine with a two-spin system coupled by anisotropic interaction: enhanced efficiency at finite times
• Trapped-atom Otto engine with light-induced dipole-dipole interactions
• Anisotropy-assisted thermodynamic advantage of a local-spin thermal machine
• Quasi-probability distribution of work in a measurement-based quantum Otto engine