
Contents
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11.1 Introduction 11.1 Introduction
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11.2 The ‘Pre-von Neumann’ Period 11.2 The ‘Pre-von Neumann’ Period
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11.3 John von Neumann 11.3 John von Neumann
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11.4 The Subjectivist Approach and Early Reactions 11.4 The Subjectivist Approach and Early Reactions
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11.5 The Thermodynamic Amplification Programme 11.5 The Thermodynamic Amplification Programme
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11.6 Insolubility Proofs 11.6 Insolubility Proofs
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11.7 Other Approaches before the 1970s 11.7 Other Approaches before the 1970s
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11.8 Objectivist Approaches in the 1970s and 1980s 11.8 Objectivist Approaches in the 1970s and 1980s
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11.9 Conclusions 11.9 Conclusions
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Acknowledgments Acknowledgments
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References References
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11 The Measurement Problem
Get accessAssociate Professor, Department of Philosophy, Universidade de São Paulo
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Published:19 May 2022
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Abstract
This chapter reviews the history of the measurement problem in quantum mechanics, from its roots in the wave-particle paradox until around 1990. After examining von Neumann’s formulation of the problem, the proposed solutions are examined, separated into objectivist solutions, subjectivist views, the many worlds interpretation, and views that consider the measurement problem to be a pseudoproblem. The debate blossomed in the 1960s, with new versions of von Neumann’s insolubility proofs, the consideration of null-result measurements, and the proposal of non-linear corrections to the Schrödinger equation. In the 1970s and 1980s, new objectivist ideas were put forward, such as the notion that all systems are open, and the theory of stochastic localizations, which merged with the non-linear approach. Many solutions also assumed that the apparatus should be described with infinite degrees of freedom. Experiments have extended the known limits of quantum superpositions, addressing the question of whether macroscopic superpositions are possible.
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