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CRC Press eBooks

Neutralizing Misunderstandings on Quantum Mechanics

F. J. Duarte

Published Apr 10, 2026• 0 citations
Publisher

Abstract

Here, the misunderstandings on quantum mechanics listed in the previous chapter are directly confronted, with known physics. Next, we provide a preview via a couple of those misunderstandings. First, a popular confusion is that quantum mechanics means the existence of ‘parallel universes.’ No. The parallel universe notion is just one of many alternative interpretations of quantum mechanics. Another popular misunderstanding is that quantum mechanics is at odds with reality . Not so. The statement, by Dalitz and Duarte, ‘Already in 1948, observations agreed with quantum mechanics, not with local realism’ might appear, at first, to introduce a divergence between quantum mechanics and reality. However, this apparent divergence immediately disappears if we adopt the experimentally verified nonlocality of the photon as part of our reality .

DOI
10.1201/9781003649434-29

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Here, the misunderstandings on quantum mechanics listed in the previous chapter are directly confronted, with known physics. Next, we provide a preview via a couple of those misunderstandings. First, a popular confusion is that quantum mechanics means the existence of ‘parallel universes.’ No. The parallel universe notion is just one of many alternative interpretations of quantum mechanics. Another popular misunderstanding is that quantum mechanics is at odds with reality . Not so. The statement, by Dalitz and Duarte, ‘Already in 1948, observations agreed with quantum mechanics, not with local realism’ might appear, at first, to introduce a divergence between quantum mechanics and reality. However, this apparent divergence immediately disappears if we adopt the experimentally verified nonlocality of the photon as part of our reality .
Quantum mechanics deals with complex waves and fields. Quantum mechanics does not deal directly with everyday objects that we can see, touch, and smell. This has provided critics and commentators the opportunity to construct a large edifice of misunderstandings. However, commentators outside physics should be forgiven since most of these misunderstandings have originated among the files of physics practitioners themselves. Here, we list more than a dozen misunderstandings, knowing full well that perhaps there are more. These misunderstandings belong to basically two camps: a physics category and a beyond physics category, all the way to the meaning of reality. In the next chapter we neutralize these misunderstandings one by one.
Quantum mechanics (QM) has attracted a considerable amount of mysticism, in public opinion and even among academic researches, due to some of its conceptually puzzling features, such as the modification of reality by the observer and entanglement. We argue that many popular "quantum paradoxes" stem from a confusion between mathematical formalism and physics; We demonstrate this by explaining how the paradoxes go away once a different formalism, usually inconvenient to perform calculations, is used. we argue that some modern developments, well-studied in the research literature but generally overlooked by both popular science and teaching-level literature, make quantum mechanics (that is, "canonical" QM, not extensions of it) less conceptually problematic than it looks at first sight. When all this is looked at together, most "conceptual puzzles" of QM are not much different from the well-known paradoxes from probability theory. Consequently, "explanations of QM" involving physical action of consciouses or an infinity of universes are conceptually unnecessary
For over nine decades, quantum mechanics has profoundly shaped our understanding of nature, offering explanations for the stability of atoms, the formation of mole cules, the properties of materials, and phenomena such as light or radioactivity. It is essential to modern technologies—from microchips to lasers—and underpins the physics of elementary particles. Yet, despite its successes, it remains a deeply mysterious theory, confronting a central enigma: why does the quantum world behave so differently from everyday reality? Elements such as superposition and quantum entanglement—which allow particles to exist simultaneously in multiple states or remain interconnected regardless of distance—contradict classical world intuitions. This gap between microscopic and macroscopic behavior has given rise to what is known as the “measurement problem,” raising fundamental questions about the nature of reality. Diverging interpretations have led to two major schools of thought: anti-realism, promoted by Niels Bohr, which holds that reality depends on the observer and their interaction with measurement instruments; and realism, supported by Albert Einstein, which argues that quantum mechanics is incomplete and that eality exists independently of observation. Bohr’s complementary philosophy and Heisenberg’s uncertainty principle were central to the formulation of the “Copenhagen interpretation,” which became dominant in the 20th century. However, the persistent opposition of scientists like Einstein and Schrödinger inspired generations of physicists to seek a unification between quantum mechanics and relativity, culminating in new theories such as loop quantum gravity and string theory. Thus, the debate between realism and anti-realism remains alive, and philosophy continues to play a crucial role in exploring the new foundations of physics.
Is there a quantum reality which is distinct from a ‘classical reality’? Or is there only one reality determined by physical measurements? The observation by Dalitz and Duarte – ‘Already in 1948, observations agreed with quantum mechanics, not with local realism’ – appears to suggest a departure from classical reality. However, going back to the inescapable truth that Nature describes herself via the experiment , then such divergence between quantum and classical realities is not all that transparent since what made the quote above possible is the nonlocality of the photon . And the nonlocality of the photon is a measurable physical phenomenon. This observation suggests that quantum reality is grander and includes, as a subset, ‘classical reality.’
Abstract This chapter surveys various proposals to interpret—that is, make sense of—quantum mechanics. We could attempt to think of quantum mechanics in purely instrumentalist terms, as an algorithm to predict observed experimental results. But this fits badly with scientific practice and is probably not viable. We could attempt to modify quantum mechanics itself to resolve the paradoxes, and there are some simple models that attempt to do that: some are ‘hidden-variable’ theories that add extra properties to the theory, some are ‘dynamical-collapse’ theories that modify the theory’s equations. But none of these models succeed in reproducing quantum theory’s predictions outside a relatively narrow range of applications. Or we could try to take the apparent indefiniteness of quantum mechanics literally, and interpret it as a theory of many parallel worlds. The correct interpretation of quantum mechanics remains controversial, but the search for understanding and interpretation of the theory has led to very substantial scientific results and is likely to lead to more.