Classical perception follows solely from the linearity of quantum mechanics with no need for decoherence or the environment

Abstract

As illustrated by Schrodingers cat, there are often several macroscopically different versions of reality simultaneously existing in the wave function. On the face of it, this would seem to imply that an observer could perceive a superposition of versions and thereby put quantum mechanics at odds with our perceptions. However one can show, without invoking decoherence or the environment, that the linearity of quantum mechanics implies we will perceive only a single, classical version of reality. Linearity also implies our perceptions will have a particle-like consistency.