Titlebook: Relativistic Quantum Measurement and Decoherence; Lectures of a Worksh Heinz-Peter Breuer,Francesco Petruccione Conference proceedings 2000

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False Loss of Coherence,on of some systems as being incoherent when they are not. The spin boson problem and the harmonic oscillator with massive scalar field heat baths are given as examples of reduced incoherent density matrices which nevertheless still represent perfectly coherent systems.

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0075-8450 istent picture for the processes of decoherence and quantum measurement requires a treatment which is compatible with the theory of relativity. This volume reviews some of the approaches suggested to solve or circumvent the arising difficulties. Starting from an analysis of the level of compatibilit

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Special Relativity as an Open Question,Review ., 470-491 (1986)], or rather it is connected with the persistent . of those attempts, it is connected with the most obvious strategy for giving those attempts .. And that (in the end) is what this paper is going to be about.

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Decoherence: A Dynamical Approach to Superselection Rules?,the spaces of states and observables in order to establish a fairly precise notion of superselection rules. We then discuss two examples: 1.) the Bargmann superselection rule for overall mass in ordinary quantum mechanics, and 2.) the superselection rule for charge in quantum electrodynamics.

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Quantum Histories and Their Implications,ines a version of quantum theory with greater predictive power than the consistent histories formalism. If not, andour observations are defined by a non-ordered consistent quantum history, then subspace implications are not generally valid.

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Event-Ready Entanglement,s the fundamental physical difference between states in a Hilbert space and in a Fock space. Methods suggested to enhance the entanglement in the outgoing state as given by Braunstein and Kimble [. ., 840 (1998)] generally fail.