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The Quantum MatrixHenry Bar's Perilous Struggle for Quantum Coherence$
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Gershon Kurizki and Goren Gordon

Print publication date: 2020

Print ISBN-13: 9780198787464

Published to Oxford Scholarship Online: July 2020

DOI: 10.1093/oso/9780198787464.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 20 January 2022

What are Quantum Measurements?

What are Quantum Measurements?

(p.63) 4 What are Quantum Measurements?
The Quantum Matrix

Gershon Kurizki

Goren Gordon

Oxford University Press

Chapter 4 introduces a great QM mystery: the notion of quantum measurements. Henry is in a superposition of versions localized in several places, but when Eve measures Henry’s position she (as a classical observer) either sees Henry or she does not. Physical reality is made of such measurements. Eve’s measurement projects or collapses Henry’s superposition state to a single location. The meaning of quantum-state or wavefunction “collapse” and the role of the observer have been at the heart of the historical debate concerning the interpretation of QM. Whereas Von Neumann and Wigner stressed the inseparability of the observed (measured) world from the human mind, alternative “observer-free” views were suggested, such as Everett’s many-world interpretation or Zurek’s quantum Darwinism that replaces the observer by the environment. In the appendix to this chapter the notion of probability amplitudes is elucidated, new notations for operators are introduced and projection operators are presented.

Keywords:   quantum measurements, wavefunction collapse, projection postulate, active observer, many-world interpretation, quantum Darwinism, projection operators

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