Finite-time two-spin quantum Otto engines: Shortcuts to adiabaticity vs. irreversibility

Turkish journal of physics

article

BARIŞ ÇAKMAK¹ 

[1] Department of Energy Systems Engineering, Faculty of Engineering and Natural Sciences, Bahçeşehir University

关键词: Quantum thermodynamics;    quantum heat engines;    shortcuts to adiabaticity;    thermodynamic irreversibility;   

DOI  :  10.3906/fiz-2101-10

学科分类：物理（综合）

来源: Scientific and Technical Research Council of Turkey - TUBITAK

【 摘 要 】

We propose a quantum Otto cycle in a two spin-1/2 anisotropic XY model in a transverse external magnetic field. We first characterize the parameter regime that the working medium operates as an engine in the adiabatic regime. Then, we consider finite-time behavior of the engine with and without utilizing a shortcut to adiabaticity (STA) technique. STA schemes guarantee that the dynamics of a system follows the adiabatic path, at the expense of introducing an external control. We compare the performance of the nonadiabatic and STA engines for a fixed adiabatic efficiency but different parameters of the working medium. We observe that, for certain parameter regimes, the irreversibility, as measured by the efficiency lags, due to finite-time driving is so low that nonadiabatic engine performs quite close to the adiabatic engine, leaving the STA engine only marginally better than the nonadiabatic one. This suggests that by designing the working medium Hamiltonian one may spare the difficulty of dealing with an external control protocol.

【 授权许可】

Unknown