QBism and Relational Quantum Mechanics compared

@article{Pienaar2021QBismAR,
  title={QBism and Relational Quantum Mechanics compared},
  author={Jacques L. Pienaar},
  journal={Foundations of Physics},
  year={2021}
}
  • J. Pienaar
  • Published 31 August 2021
  • Education
  • Foundations of Physics
In this paper we compare the subjective Bayesian interpretation of quantum mechanics (QBism) [1–13] with Rovelli’s relational interpretation of quantum mechanics (RQM) [14–31]. Both interpretations are notable for endorsing the radical principle of relative facts, which holds that the question whether or not a physical quantity has been observed to take a definite value only has an answer relative to a specified observer. Although QBism and RQM are not alone in their endorsement of relative… 

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References

SHOWING 1-10 OF 53 REFERENCES

Rovelli’s relational quantum mechanics, anti-monism and quantum becoming

In this paper I present and defend Rovelli's relation quantum mechanics (RQM) from some foreseeable objections, so as to clarify its philosophical implications vis a vis rival interpretations. In

Open Problems in Relational Quantum Mechanics

TLDR
It is shown that it is far from clear what a relativization of states to observers exactly achieves and in what sense such an approach really advances the authors' understanding of the peculiar features of quantum phenomena, and it is argued that the claim that RQM is able to preserve locality is at best dubious.

Representation Lost: The Case for a Relational Interpretation of Quantum Mechanics

TLDR
It is argued that unitary evolution has a counterpart in classical probability theory: in both cases (quantum and classical) probabilities relative to a non-participating observer evolve according to an entropy maximizing principle (and can be interpreted as rational opinion updating).

Can We Make Sense of Relational Quantum Mechanics?

TLDR
It is claimed that there is currently no adapted locality criterion to evaluate whether the resulting interpretation is local or not, and one of its central claims concerning the possibility for an observer to have knowledge about other observer’s events is clarified.

QBism, the Perimeter of Quantum Bayesianism

This article summarizes the Quantum Bayesian point of view of quantum mechanics, with special emphasis on the view's outer edges---dubbed QBism. QBism has its roots in personalist Bayesian

Relational Quantum Mechanics and the Determinacy Problem

TLDR
Carlo Rovelli's relational interpretation of quantum mechanics leaves us with a paradox having to do with the determinacy of measurement outcomes, which can be accepted only if the authors are willing to give up on certain elements of the ‘absolute’ view of the world.

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.

The Bundle Theory Approach to Relational Quantum Mechanics

TLDR
A new metaphysical interpretation of Relational Quantum Mechanics (RQM) in terms of mereological bundle theory is provided, claiming that a physical system in RQM can be defined as a mereological fusion of properties whose values may vary for different observers.

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

Notwithstanding Bohr, the Reasons for QBism

Without Niels Bohr, QBism would be nothing. But QBism is not Bohr. This paper attempts to show that, despite a popular misconception, QBism is no minor tweak to Bohr's interpretation of quantum
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