On the Quantum Measurement Problem

@article{Brukner2017OnTQ,
  title={On the Quantum Measurement Problem},
  author={{\vC}aslav Brukner},
  journal={arXiv: Quantum Physics},
  year={2017},
  pages={95-117}
}
  • Č. Brukner
  • Published 19 July 2015
  • Physics
  • arXiv: Quantum Physics
In this paper, I attempt a personal account of my understanding of the measurement problem in quantum mechanics, which has been largely in the tradition of the Copenhagen interpretation. I assume that (i) the quantum state is a representation of knowledge of a (real or hypothetical) observer relative to her experimental capabilities; (ii) measurements have definite outcomes in the sense that only one outcome occurs; (iii) quantum theory is universal and the irreversibility of the measurement… 
A strong no-go theorem on the Wigner’s friend paradox
Does quantum theory apply at all scales, including that of observers? New light on this fundamental question has recently been shed through a resurgence of interest in the long-standing Wigner’s
Histories Without Collapse
  • A. Sudbery
  • Physics
    International Journal of Theoretical Physics
  • 2022
TLDR
A simple model based on Wigner's friend is examined, in which Bell's model and the projection postulate give different probabilities for the histories of a sentient system, and it is shown that the Born rule gives the same result as applying projection in the course of the history, because of entanglement with the memory.
The View from a Wigner Bubble
In a recent no-go theorem [Bong et al, Nature Physics (to appear)], we proved that the predictions of unitary quantum mechanics for an extended Wigner's friend scenario are incompatible with any
Wigner’s friend and Relational Quantum Mechanics: A Reply to Laudisa
Relational Quantum Mechanics is an interpretation of quantum mechanics proposed by Carlo Rovelli. Rovelli argues that, in the same spirit as Einstein’s theory of relativity, physical quantities can
Life as an Explanation of the Measurement Problem
No consensus regarding the universal validity of any particular interpretation of the measurement problem has been reached so far. The problem manifests strongly in various Wigner's-friend-type
Is QBism a Possible Solution to the Conceptual Problems of Quantum Mechanics
TLDR
This work will examine if QBism's claims are robust and will show that a certain number of issues needs to be clarified in order to get a coherent picture.
Real or not real that is the question...
My discussions with John Bell about reality in quantum mechanics are recollected. I would like to introduce the reader to Bell’s vision of reality which was for him a natural position for a
Linear Superposition as a Core Theorem of Quantum Empiricism
Clarifying the nature of the quantum state |Ψ⟩ is at the root of the problems with insight into counter-intuitive quantum postulates. We provide a direct—and math-axiom free—empirical derivation of
Quantum theory cannot consistently describe the use of itself
TLDR
A variant of Wigner’s friend Gedankenexperiment where each of the current interpretations of QM fails in giving a consistent description, indicating that quantum theory cannot be extrapolated to complex systems, at least not in a straightforward manner.
Observer-independence in the presence of a horizon
In the famous thought experiment known as Wigner's friend, Wigner assigns an entangled state to the composite quantum system consisting of his friend and her observed system. In the context of this
...
...

References

SHOWING 1-10 OF 55 REFERENCES
Two Dogmas About Quantum Mechanics
We argue that the intractable part of the measurement problem -- the 'big' measurement problem -- is a pseudo-problem that depends for its legitimacy on the acceptance of two dogmas. The first dogma
Relational quantum mechanics
I suggest that the common unease with taking quantum mechanics as a fundamental description of nature (the “measurement problem”) could derive from the use of an incorrect notion, as the unease with
Einstein, Incompleteness, and the Epistemic View of Quantum States
TLDR
It is shown that for models wherein the quantum state has the status of something real, the failure of locality can be established through an argument considerably more straightforward than Bell’s theorem.
Quantum Theory and Beyond: Is Entanglement Special?
Quantum theory makes the most accurate empirical predictions and yet it lacks simple, comprehensible physical principles from which the theory can be uniquely derived. A broad class of probabilistic
Quantum-Bayesian Coherence
TLDR
It is argued that the Born Rule should be seen as an empirical addition to Bayesian reasoning itself, and how to view it as a normative rule in addition to usual Dutch-book coherence is shown.
Quantum non-locality—it ainʼt necessarily so...
Bellʼs theorem is 50 years old. There still remains a controversy about its implications. Much of this controversy has its roots in confusion regarding the premises from which the theorem can be
No extension of quantum theory can have improved predictive power
TLDR
This work says that no extension of quantum theory can give more information about the outcomes of future measurements than quantum theory itself, under the assumption that measurements can be chosen freely.
Information and Fundamental Elements of the Structure of Quantum Theory
According to Aage Petersen Niels Bohr liked to say: “There is no quantum world. There is only an abstract quantum physical description. It is wrong to think that the task of physics is to find out
Decoherence, einselection, and the quantum origins of the classical
as quantum engineering. In the past two decades it has become increasingly clear that many (perhaps all) of the symptoms of classicality can be induced in quantum systems by their environments. Thus
...
...