Abstract
The minimal set of thermodynamic control parameters consists of a statistical (thermal) and a mechanical one. These suffice to introduce all the pertinent thermodynamic variables; thermodynamic processes can then be defined as paths on this 2-dimensional control plane. Putting aside coherence we show that for a large class of quantum objects with discrete spectra and for the cycles considered the Carnot efficiency applies as a universal upper bound. In the dynamic (finite time) regime renormalized thermodynamic variables allow to include non-equilibrium phenomena in a systematic way. The machine function ceases to exist in the large speed limit; the way, in which this limit is reached, depends on the type of cycle considered.
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Birjukov, J., Jahnke, T. & Mahler, G. Quantum thermodynamic processes: a control theory for machine cycles. Eur. Phys. J. B 64, 105–118 (2008). https://doi.org/10.1140/epjb/e2008-00270-2
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DOI: https://doi.org/10.1140/epjb/e2008-00270-2