THERMAL SCIENCE

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Majdi Alsulami

,

Eied Mahmoud Khalil

QUANTUM OTTO MACHINES POWERED BY A SINGLE QUBIT IN A SPIN STAR ENVIRONMENT

ABSTRACT
This paper examines the performance analysis of quantum Otto machines (QOM) driven by a single qubit system embedded within a spin star environment. We investigate various thermodynamic correlations during the operation of these machines, including work performed, heat absorbed, and heat emissions. For the sake of simplicity, our exploration centers around two scenarios: one where the central qubit interacts with a single spin and another where it interacts with four qubits. Our findings reveal that QOM employing this system exhibit unique thermodynamic properties. Notably, we observe that the QOM can achieve enhanced levels of work performed as the number of spins in the environment increases. Furthermore, both the work performed and the efficiency of the QOM are influenced by the variation in detuning and coupling strength parameters across the four stages of its operation. Additionally, we demonstrate that careful selection of these parameters enables the optimization of QOM performance. In certain instances, the performance of the Otto cycle can be stabilized to emulate the behaviour of a heat engine by manipulating the coupling values while simultaneously controlling the frequency of the central qubit.
KEYWORDS
quantum Otto machines, spin star environment, work performed, thermodynamic correlations, quantum heat engines
PAPER SUBMITTED: 2024-07-17
PAPER REVISED: 2024-09-20
PAPER ACCEPTED: 2024-10-27
PUBLISHED ONLINE: 2025-01-25
DOI REFERENCE: https://doi.org/10.2298/TSCI2406867A
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 6, PAGES [4867 - 4876]
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Quantum Otto machines powered by a single qubit in a spin star environment

2025 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence