Physics – Quantum Physics
Scientific paper
2006-11-28
Phys. Rev. E 76. 031105 (2007)
Physics
Quantum Physics
17 pages, 9 figures, 4 tables
Scientific paper
10.1103/PhysRevE.76.031105
In order to describe quantum heat engines, here we systematically study isothermal and isochoric processes for quantum thermodynamic cycles. Based on these results the quantum versions of both the Carnot heat engine and the Otto heat engine are defined without ambiguities. We also study the properties of quantum Carnot and Otto heat engines in comparison with their classical counterparts. Relations and mappings between these two quantum heat engines are also investigated by considering their respective quantum thermodynamic processes. In addition, we discuss the role of Maxwell's demon in quantum thermodynamic cycles. We find that there is no violation of the second law, even in the existence of such a demon, when the demon is included correctly as part of the working substance of the heat engine.
Liu Yu-xi
Nori Franco
Quan H. T.
Sun Chang-Pu
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