Regensburg 2010 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 31: Statistical Physics far from Equilibrium

DY 31.2: Vortrag

Freitag, 26. März 2010, 10:45–11:00, H38

Generalized Clausius inequality for non-quasistatic quantum processes — •Sebastian Deffner and Eric Lutz — Universität Augsburg, D-86135 Augsburg, Germany

We sharpen the Clausius inequality for the irreversible entropy production of a quantum system arbitrarily far from equilibrium by introducing a positive, process dependent lower bound. We express the latter in terms of the Bures distance, a quantum information theoretic measure of distinguishability, between the nonequilibrium and the corresponding equilibrium density operators of the system. As an illustration, we evaluate the entropy production and the Bures distance for an analytically solvable model, namely the time-dependent harmonic oscillator.