Comment on "on a new definition of quantum entropy"

Keyvan Sadri

Published 2008-03-14Version 1

In the article, on a new definition of quantum entropy, Campisi has explained an operator for entropy based on quantum number operator. It has been claimed that the expectation values for this operator increases for every non-quasi-static time dependent perturbations. We have found an example for a case that entropy with this definition does not increase through a spontaneous process.