TY - JOUR
TI - Quantum Otto machines powered by a single qubit in a spin star environment
AU - Alsulami Majdi
AU - Khalil Eied Mahmoud
JN - Thermal Science
PY - 2024
VL - 28
IS - 6
SP - 4867
EP - 4876
PT - Article
AB - 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.