Thermodynamic processes generated by a class of completely positive quantum operations

Details Thermodynamic processes generated by a class of completely positive quantum operations Thermodynamic processes generated by a class of completely positive quantum operations

2012-02-20

arxiv.org/abs/1202.4397v1

Int. J. Mod. Phys. B 26, 1241001 (2012). (not in Modern Physics Letters B)

Physics

Condensed Matter

Statistical Mechanics

22 pages and 1 figure. Modern Physics Letters B, in press

Scientific paper

An attempt toward the operational formulation of quantum thermodynamics is made by employing the recently proposed operations forming positive operator-valued measures for generating thermodynamic processes. The quantity of heat as well as the von Neumann entropy monotonically increases under the operations. The fixed point analysis shows that repeated applications of these operations to a given system transform from its pure ground state at zero temperature to the completely random state in the high temperature limit with intermediate states being generically out of equilibrium. It is shown that the Clausius inequality can be violated along the processes, in general. A bipartite spin-1/2 system is analyzed as an explicit example.

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