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• W2950941656 startingPage "013055" @default.
• W2950941656 abstract "The Carnot cycle combines reversible isothermal and adiabatic strokes to obtain optimal efficiency, at the expense of a vanishing power output. Quantum Carnot-analog cycles are constructed and solved, operating irreversibly at non-vanishing power. Swift thermalization is obtained in the isotherms utilizing a shortcut to equilibrium protocols and the adiabats employ frictionless unitary shortcuts. The working medium in this study is composed of a particle in a driven harmonic trap. For this system, we solve the dynamics employing a generalized canonical state. Such a description incorporates both changes in energy and coherence. This allows comparing three types of Carnot-analog cycles, Carnot-shortcut, Endo-shortcut and Endo-global. The Carnot-shortcut engine demonstrates the trade-off between power and efficiency. It posses a maximum in power, a minimum cycle time where it becomes a dissipator and for a diverging cycle time approaches the ideal Carnot efficiency. The irreversibility of the cycle arises from non-adiabatic driving, which generates coherence. To study the role of coherence we compare the performance of the shortcut cycles, where coherence is limited to the interior of the strokes, with the Endo-global cycle where the coherence never vanishes. The Endo-global engine exhibits a quantum signature at a short cycle-time, manifested by a positive power output while the shortcut cycles become dissipators. If energy is monitored the back action of the measurement causes dephasing and the power terminates." @default.
• W2950941656 created "2019-06-27" @default.
• W2950941656 creator A5080271077 @default.
• W2950941656 creator A5086549023 @default.
• W2950941656 date "2020-01-01" @default.
• W2950941656 modified "2023-10-02" @default.
• W2950941656 title "Quantum signatures in the quantum Carnot cycle" @default.
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• W2950941656 doi "https://doi.org/10.1088/1367-2630/ab6876" @default.
• W2950941656 hasPublicationYear "2020" @default.
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