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Measurement-induced decoherence and information in double-slit interference

Published

Author(s)

Joshua Kincaid, Kyle McLelland, Michael P. Zwolak

Abstract

The double slit experiment provides the classic example of both interference and the effect of observation in quantum physics. When particles are sent individually through a pair of slits, a wave-like interference pattern develops; no such interference is found when one observes which "path" the particles take. We present a model of interference, dephasing, and measurement-induced decoherence in a one-dimensional version of the double-slit experiment. Using this model, we demonstrate how the loss of interference in the system is correlated with the information gain by the measuring apparatus/observer. In doing so, we give a modern account of measurement in this paradigmatic example of quantum physics that is accessible to students taking quantum mechanics at the graduate or senior undergraduate levels.
Citation
American Journal of Physics
Volume
84
Issue
7

Keywords

Measurement-induced decoherence, Interference, Quantum Information
Created July 20, 2016, Updated November 10, 2018