2021/02/26 by Barış Çakmak
Computer Science · Mathematics · Physics and Astronomy · #Adiabatic process #Adiabatic quantum computation #Advanced Thermodynamics and Statistical Mechanics #Classical mechanics #Computer science #Hamiltonian (control theory) #Heat engine #Mathematical optimization #Mathematics #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum computer #Quantum mechanics #Spin (aerodynamics) #Statistical physics #cond-mat.stat-mech #quant-ph
paper · pdf · doi:10.3906/fiz-2101-10
published as Turk J Phys 45, 59-73 (2021) · 10 pages, 5 figures. An extension on the previous work arXiv:1812.00969. Comments are always welcome. v2: fixed some typos and updated the reference list. Close to published version
openalex publication_date 2021/02/26 · arxiv created 2021/03/01 · arxiv updated 2021/03/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.