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Proceedings Paper

Decoherence and measurement in open quantum systems
Author(s): Vladimir Privman; Dima V. Mozyrsky
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Paper Abstract

We review results of a recently developed model of a microscopic quantum system interacting with the macroscopic world components which are modeled by collections of bosonic modes. The interaction is via a general operator (Lambda) of the system, coupled to the creation and annihilation operators of the environment modes. We assume that in the process of a nearly instantaneous quantum measurement, the function of the environment involves two distinct parts: the pointer and the bath. Interaction of the system with the bath leads to decoherence such that the system and the pointer both evolve into a statistical mixture state described by the density matrix such that the system is in one of the eigenstates of (Lambda) with the correct quantum mechanical probability, whereas the expectation values of pointer operators retain amplified information on that eigenstate. We argue that this process represents the initial step of a quantum measurement.

Paper Details

Date Published: 13 July 2000
PDF: 12 pages
Proc. SPIE 4047, Quantum Computing, (13 July 2000); doi: 10.1117/12.391966
Show Author Affiliations
Vladimir Privman, Clarkson Univ. (United States)
Dima V. Mozyrsky, Clarkson Univ. (United States)

Published in SPIE Proceedings Vol. 4047:
Quantum Computing
Eric Donkor; Andrew R. Pirich, Editor(s)

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