Janssen, Hanneke
(2008)
Reconstructing Reality: EnvironmentInduced Decoherence, the Measurement Problem, and the Emergence of Definiteness in Quantum Mechanics.
[Preprint]
Abstract
This work is a critique of the program of "environmentinduced decoherence" as advocated by Zurek, Zeh and Joos, among others. In particular, the alleged relevance of decoherence for a solution of the "measurement problem" is subjected to a detailed philosophical analysis. In the first chapter, an attempt is made to unravel what exactly this "measurement problem" amounts to for the decoherence theorists. The second chapter reviews the standard decoherence literature. The third chapter starts with a brief discussion of the philosophical implications of the decoherence program, followed by a nonstandard reconstruction of the decoherence argument that aims to uncover some (mostly hidden) assumptions underlying the approach. It is argued that different subsets of these assumptions result in different versions of the decoherence argument. Next, these assumptions are investigated in more detail, and a number of open problems for the decoherence approach is formulated, in addition to the wellknown "problem of outcomes". These problems concern the interpretational relevance of the preferred basis, the role and status of the ignorance interpretation of mixed states, imperfect decoherence and the role of the environment and the definition of subsystems. The fourth chapter addresses the question to what extent the embedding of decoherence in an Everettlike interpretational framework, such as Zurek's "existentional interpretation" and Wallace's structuralrealistic version of the manyworlds interpretation, helps to resolve these problems. The main conclusions are formulated in the fifth chapter. Namely: 1) decoherence cannot address the "preferredbasis problem" without adding new interpretational axioms to the standard formalism, 2) the the locality principle (that says that the environment is the "irrelevant" part and should therefore be ignored) is not only problematic but also interpretationally superfluous, 3) the decoherence approach, when formulated in terms of the standard interpretation of quantum mechanics, is predicated on a solution of the "problem of outcomes" and thus cannot claim to account (even partially) for the latter, and 4) that the results of the decoherence program do not increase the plausibility of a realist interpretation of the quantum state.
Item Type: 
Preprint

Creators: 
Creators  Email  ORCID 

Janssen, Hanneke   

Additional Information: 
This paper is an MSc thesis. Unfortunately, the author passed away in a traffic accident on November 11, 2008. 
Keywords: 
environmentinduced decoherence, measurement problem, quantumtoclassical transition, preferredbasis problem, interpretations of quantum mechanics, manyworlds interpretation 
Subjects: 
Specific Sciences > Physics > Quantum Mechanics 
Depositing User: 
Hanneke Janssen

Date Deposited: 
15 Oct 2008 
Last Modified: 
07 Oct 2010 15:17 
Item ID: 
4224 
URI: 
http://philsciarchive.pitt.edu/id/eprint/4224 
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