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THE PRESENT SITUATION IN QUANTUM MECHANICS: A TRANSLATION OF SCHR6DINGER'S "CAT PARADOX" PAPER

John Dezendorf Trimmer

Published Jan 1, 2014• 69 citations
OpenAlex

Abstract

This is a translation of Schr6dinger's three-part 1935 paper 1 in Die Naturzkissenschaften. Earlier that same year there had appeared the Einstein, Podolsky, Rosen paper 2 (also famous in paradoxology) which, Schrodinger says, in a footnote, motivated his offering. Along with this article in German, Schrodinger had two closely related English-language publications.3 But the German, aside from its oneparagraph presentation of the famous cat, covers additional territory and gives many fascinating insights into Schrodinger's thought. The translator's goal has been to adhere to the logical and physical content of the original, while at the same time trying to convey something of its semi-conversational, at times slightly sardonic flavor.

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This is a translation of Schr6dinger's three-part 1935 paper 1 in Die Naturzkissenschaften. Earlier that same year there had appeared the Einstein, Podolsky, Rosen paper 2 (also famous in paradoxology) which, Schrodinger says, in a footnote, motivated his offering. Along with this article in German, Schrodinger had two closely related English-language publications.3 But the German, aside from its oneparagraph presentation of the famous cat, covers additional territory and gives many fascinating insights into Schrodinger's thought. The translator's goal has been to adhere to the logical and physical content of the original, while at the same time trying to convey something of its semi-conversational, at times slightly sardonic flavor.
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 Schrodinger's cat. In this Viewpoint, I will concentrate on the paradox of Schrodinger's cat or, as it is often known (to my mind somewhat misleadingly), the quantum measurement paradox.
We review both the Einstein, Podolsky, Rosen (EPR) paper about the completeness of quantum theory, and Schrodinger's responses to the EPR paper. We find that both the EPR paper and Schrodinger's responses, including the cat paradox, are not consistent with the current understanding of quantum theory and thermodynamics. Because both the EPR paper and Schrodinger's responses play a leading role in discussions of the fascinating and promising fields of quantum computation and quantum information, we hope our review will be helpful to researchers in these fields.
The purpose of this paper is to resolve two paradoxes, which occur in quantum theory, by using the discussion of the theory of measurement presented in two earlier papers by the author [3], [4], [5]. The two paradoxes discussed will be the Schrödinger cat paradox and the Einstein, Podolski, Rosen paradox [2]. An introductory section will be included which summarizes the relevant results from the author's previous papers. Also a discussion will be made regarding the author's interpretation of the density operator.