We establish an algebraic criterion which ensures the strict positivity of the entropy production in quantum models consisting of a small system coupled to thermal reservoirs at different temperatures.
@article{arxiv.math-ph/0507009,
title = {A Remark on the Strict Positivity of the Entropy Production},
author = {Walter H. Aschbacher and Herbert Spohn},
journal= {arXiv preprint arXiv:math-ph/0507009},
year = {2009}
}