Entropy, information and Maxwell's demon after quantum mechanics

Abstract

The problem of the subjective nature of entropy and its relation to information and irreversibility is examined in the light of the quantum measure- ment problem. The main thesis of the paper is that state collapse during a measure- ment and hence entropy increase in the observed universe is seen by observers who are only able to observe a restricted manifold of states determined by their concepts, language, etc., in short by their level of perception. The thesis leads to the asser- tion that any universe with a structure must evolve.