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Science 11 February 2005:
Vol. 307. no. 5711, pp. 871 - 872
DOI: 10.1126/science.1109541
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Viewpoint

The Quantum Measurement Problem

A. J. Leggett

Despite the spectacular success of quantum mechanics (QM) over the last 80 years in explaining phenomena observed at the atomic and subatomic level, the conceptual status of the theory is still a topic of lively controversy. Most of the discussion centers around two famous paradoxes (or, as some would have it, pseudoparadoxes) associated, respectively, with the names of Einstein, Podolsky, and Rosen (EPR) and with Schrödinger's cat. In this Viewpoint, I will concentrate on the paradox of Schrödinger's cat or, as it is often known (to my mind somewhat misleadingly), the quantum measurement paradox.

Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Is Quantum Theory Exact?.
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