Decoherence, Time Scales and Pointer States

TL;DR

This paper investigates the time-scales of environment-induced decoherence and the nature of pointer states using a Stern-Gerlach model coupled to a heat bath, clarifying misconceptions about decoherence time-scales.

Contribution

It introduces a new analysis of pointer states in a Stern-Gerlach system, highlighting differences from previous literature and clarifying decoherence time-scale issues.

Findings

Identified distinct emergent pointer states in the model

Clarified the decoherence time-scale concept

Compared new pointer states with those previously discussed

Abstract

Certain issues regarding the time-scales over which environment-induced decoherence occurs, and the nature of emergent pointer states, are discussed. A model system, namely, a Stern-Gerlach setup coupled to a quantum mechanical "heat-bath" is studied. The emergent pointer states for this system are obtained, which are different from those discussed in the literature. It is pointed out that this difference is due to some confusion regarding the decoherence time-scale, which is clarified here.