title: Quantum Otto cycle efficiency on coupled qudits.
abstract: Properties of the coupled particles with spin 3/2 (quartits) in a constant magnetic field, as a working substance in the quantum Otto cycle of the heat engine, are considered. It is shown that this system as a converter of heat energy in work (i) shows the efficiency 1 at the negative absolute temperatures of heat baths, (ii) at the temperatures of the opposite sign the efficiency approaches 1, (iii) at the positive temperatures of heat baths antiferromagnetic interaction raises efficiency threefold in comparison with uncoupled particles.
authors.affiliation: Institute for Theoretical Physics, National Science Center "Institute of Physics and Technology," 1, Akademicheskaya street, 61108 Kharkov, Ukraine.
authors.forename: E A
authors.initials: EA
authors.lastname: Ivanchenko