[Paper Review] Copenhagen Interpretation Delenda Est?

Christopher A. Fuchs|arXiv (Cornell University)|Sep 13, 2018

Quantum Mechanics and Applications4 references3 citations

TL;DR

This critical review challenges Adam Becker's book *What Is Real?* for misrepresenting the Copenhagen interpretation of quantum mechanics, arguing that Becker distorts Bohr's views by misattributing quotes, oversimplifying philosophical distinctions, and misrepresenting the EPR paradox. The review contends that Becker's portrayal—framing the Copenhagen interpretation as solipsistic and positivist—misrepresents the historical and philosophical depth of Bohr, Heisenberg, and Pauli, undermining a vital interpretative tradition that continues to inspire quantum foundations research.

ABSTRACT

This is a slightly extended version of a review of Adam Becker's book What is Real? The Unfinished Quest for the Meaning of Quantum Physics, to appear in American Journal of Physics. The key addition is the reference list.

Motivation & Objective

• To correct widespread misrepresentations of the Copenhagen interpretation as a solipsistic or positivist framework, as presented in Adam Becker's book.
• To highlight the philosophical sophistication of Niels Bohr, Werner Heisenberg, Wolfgang Pauli, and others, countering Becker’s oversimplified and inaccurate portrayal.
• To emphasize the enduring intellectual value of the Copenhagen interpretation, particularly its role in inspiring modern quantum foundations and quantum information science.
• To caution against the pedagogical danger of young researchers encountering Becker’s distorted narrative before engaging directly with primary sources from the Copenhagen school.
• To advocate for a more nuanced, historically accurate understanding of Bohr’s complementarity and realism, contrasting it with Becker’s reductive and polemical framing.

Proposed method

• Analyzing Becker’s central claims through close textual comparison with primary sources, including Bohr’s collected philosophical writings, Rosenfeld’s and von Weizsäcker’s works, and Heisenberg’s own statements.
• Tracing misattributed quotes—especially the key phrase 'There is no quantum world'—to their actual provenance in Aage Petersen’s recollections, not Bohr’s own words.
• Contrasting Becker’s characterization of the Copenhagen interpretation as anti-realist with direct evidence from Bohr’s own writings and correspondence, particularly his final interview with Thomas Kuhn.
• Examining Becker’s misrepresentation of the EPR argument, showing that he inverts the logical structure of the thought experiment by conflating simultaneous measurements with counterfactual inference.
• Evaluating the philosophical distinctions between positivism, operationalism, realism, and idealism, demonstrating that Becker conflates them without adequate justification.
• Drawing on contemporary quantum foundations research, especially quantum information theory, to show how the Copenhagen interpretation’s core insights—such as complementarity and the role of measurement—remain fertile and relevant.

Experimental results

Research questions

• RQ1 How accurately does Becker represent Niels Bohr’s views on quantum reality, particularly the claim that 'there is no quantum world'?
• RQ2 To what extent does Becker’s portrayal of the Copenhagen interpretation as positivist or solipsistic align with the actual philosophical positions of Bohr, Heisenberg, and Pauli?
• RQ3 What are the consequences of misrepresenting the EPR paradox in a popular science book, especially when the error affects the conceptual understanding of quantum entanglement and locality?
• RQ4 Why does Becker fail to engage with the extensive philosophical literature on Bohr’s realism and complementarity, despite citing a large bibliography?
• RQ5 How might the misrepresentation of the Copenhagen interpretation in Becker’s book hinder the next generation of physicists from engaging with its deeper insights in quantum foundations and quantum information theory?

Key findings

• The central quote 'There is no quantum world' is not from Niels Bohr, but from Aage Petersen’s posthumous recollection, a critical misattribution that distorts the book’s central argument.
• Becker’s claim that the Copenhagen interpretation is fundamentally positivist is contradicted by direct statements from Heisenberg and Pauli, who explicitly rejected such a characterization.
• The EPR argument is misrepresented by Becker: he incorrectly frames it as involving simultaneous measurements on both particles, when in fact it relies on counterfactual inference from a single measurement, a crucial conceptual error.
• The book contains multiple historical inaccuracies, including misattributing the term 'problem of measurement' to Wigner (it predates him by decades) and misidentifying Kramers, Gamow, and others as Bohr’s students when they were postdoctoral researchers.
• Despite its vivid narrative style, the book fails to engage with the deeper philosophical and physical insights of the Copenhagen interpretation, particularly its role in inspiring modern quantum information theory.
• The review argues that Becker’s polemical tone and selective use of sources risk discouraging young researchers from exploring the genuine philosophical richness of Bohr’s work, potentially impoverishing future foundational research.