Quantum Otto cycle efficiency on coupled qudits
E. A. Ivanchenko
TL;DR
This paper investigates the efficiency of a quantum Otto cycle using coupled spin-3/2 particles (quartits) as the working substance, revealing conditions for maximal efficiency and the impact of interactions and temperature signs.
Contribution
It introduces a detailed analysis of a quantum Otto cycle with coupled quartits, highlighting how negative temperatures and interactions influence efficiency.
Findings
Efficiency reaches 1 at negative absolute temperatures.
Efficiency approaches 1 at opposite sign temperatures.
Antiferromagnetic interaction triples efficiency compared to uncoupled particles.
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 to 1, (iii) at the positive temperatures of heat baths antiferromagnetic interaction raises efficiency threefold in comparison with uncoupled particles.
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