Effects of Magnetic Anisotropy on 3-Qubit Antiferromagnetic Thermal Machines
This study examines how easy-axis magnetic anisotropy affects thermal machines built from three qubits with chain or ring structures under a magnetic field. The key finding is that negative anisotropy significantly boosts engine efficiency in both Stirling and Otto cycles across all configurations. The ring topology is superior at low temperatures, and the Stirling cycle shows greater operational versatility than the Otto cycle.