Knowledge is power : Maxwell

" Maxwells demon is a hypothetical being of intelligence with molecular
order of size imagined to illustrate limitation of the second law of
thermodynamics. The Szilard engine (SZE), a physical realization
of Maxwells demon,is a machinery which extracts useful work from
information entropy. We have investigated its fully quantum mechanical
description and found the amount of extractable work is given by the
so-called relative entropy. We also discuss manifestation of quantum
statistical nature of identical particles, i.e. bosons and fermions, in a
many-particle quantum SZE. In this talk you will enjoy various aspects
of information in Physics."