Physics and Metaphysics of Wigner's Friends: Even performed pre-measurements have no results

• URL: http://arxiv.org/abs/2003.07464v6
• Date: Thu, 8 Apr 2021 22:07:36 GMT
• Title: Physics and Metaphysics of Wigner's Friends: Even performed pre-measurements have no results
• Authors: Marek \.Zukowski and Marcin Markiewicz
• Abstract summary: Wigner's Friend, who just pre-measures, can lead to valid results concerning quantum theory. This nullifies claims that a modified concept of Wigner's Friend, who just pre-measures, can lead to valid results concerning quantum theory.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: "The unambiguous account of proper quantum phenomena must, in principle, include a description of all relevant features of experimental arrangement" (Bohr). The measurement process is composed of pre-measurement (quantum correlation of the system with the pointer variable), and an irreversible decoherence via interaction with an environment. The system ends up in a probabilistic mixture of the eigenstates of the measured observable. For the pre-measurement stage, any attempt to introduce an 'outcome' leads, as we show, to a logical contradiction, $1=i$. This nullifies claims that a modified concept of Wigner's Friend, who just pre-measures, can lead to valid results concerning quantum theory.

Related papers

• Enhanced Entanglement in the Measurement-Altered Quantum Ising Chain [46.99825956909532]
  Local quantum measurements do not simply disentangle degrees of freedom, but may actually strengthen the entanglement in the system. This paper explores how a finite density of local measurement modifies a given state's entanglement structure.
  arXiv  Detail & Related papers  (2023-10-04T09:51:00Z)
• On the negative-result experiments in quantum mechanics [0.0]
  We comment on the so-called negative-result experiments (also known as null measurements, interaction-free measurements, and so on) in quantum mechanics (QM) All experiments of this kind (null-measurements) can be understood as improper measurements with an intentionally biased detector set up, which introduces exclusion or selection of certain events. The verification of the prediction made by a null-measurement requires eventually a standard unbiased measurement involving the microsystem-macroscopic detector interactions.
  arXiv  Detail & Related papers  (2023-10-03T10:56:26Z)
• Measurement incompatibility is strictly stronger than disturbance [44.99833362998488]
  Heisenberg argued that measurements irreversibly alter the state of the system on which they are acting, causing an irreducible disturbance on subsequent measurements. This article shows that measurement incompatibility is indeed a sufficient condition for irreversibility of measurement disturbance. However, we exhibit a toy theory, termed the minimal classical theory (MCT), that is a counterexample for the converse implication.
  arXiv  Detail & Related papers  (2023-05-26T13:47:00Z)
• No-go for fully unitary quantum mechanics from Bell's Theorem; comment on "Physics and Metaphysics of Wigner's Friends: Even performed pre-measurements have no results'' [0.0]
  Wigner's Friends: Even performed pre-measurements have no results. Bell's theorem: unitary decoherence cannot be solely responsible for the quantum-to-classical transition. Black hole information paradox has no physical basis.
  arXiv  Detail & Related papers  (2023-03-19T17:57:36Z)
• Quantum measurements and equilibration: the emergence of objective reality via entropy maximisation [0.0]
  We formalise the hypothesis that quantum measurements are driven by the natural tendency of closed systems to maximize entropy. We lay the groundwork for self-contained models of quantum measurement, proposing improvements to our simple scheme.
  arXiv  Detail & Related papers  (2023-02-22T10:06:17Z)
• A theory of quantum (statistical) measurement [0.0]
  We propose a theory of quantum (statistical) measurement which is close, in spirit, to Hepp's theory. We make a three-fold assumption: the measurement is not instantaneous, it lasts a finite amount of time and is, up to arbitrary accuracy, performed in a finite region of space. The fact that no irreversibility is attached to the process of measurement is shown to follow from the author's theory of irreversibility.
  arXiv  Detail & Related papers  (2022-05-25T16:56:37Z)
• Quantum state inference from coarse-grained descriptions: analysis and an application to quantum thermodynamics [101.18253437732933]
  We compare the Maximum Entropy Principle method, with the recently proposed Average Assignment Map method. Despite the fact that the assigned descriptions respect the measured constraints, the descriptions differ in scenarios that go beyond the traditional system-environment structure.
  arXiv  Detail & Related papers  (2022-05-16T19:42:24Z)
• Quantum indistinguishability through exchangeable desirable gambles [69.62715388742298]
  Two particles are identical if all their intrinsic properties, such as spin and charge, are the same. Quantum mechanics is seen as a normative and algorithmic theory guiding an agent to assess her subjective beliefs represented as (coherent) sets of gambles. We show how sets of exchangeable observables (gambles) may be updated after a measurement and discuss the issue of defining entanglement for indistinguishable particle systems.
  arXiv  Detail & Related papers  (2021-05-10T13:11:59Z)
• How well can we guess the outcome of measurements of non-commuting observables? [0.0]
  Heisenberg's uncertainty relation says there is an ultimate limit to how precisely we may predict the outcome of position and momentum measurements on a quantum system. We show that this limit may be violated by an arbitrarily large factor if one aims, instead, to guess the unknown value of a past measurement.
  arXiv  Detail & Related papers  (2021-03-30T13:31:36Z)
• Observers of quantum systems cannot agree to disagree [55.41644538483948]
  We ask whether agreement between observers can serve as a physical principle that must hold for any theory of the world. We construct examples of (postquantum) no-signaling boxes where observers can agree to disagree.
  arXiv  Detail & Related papers  (2021-02-17T19:00:04Z)
• Entropic Uncertainty Relations and the Quantum-to-Classical transition [77.34726150561087]
  We aim to shed some light on the quantum-to-classical transition as seen through the analysis of uncertainty relations. We employ entropic uncertainty relations to show that it is only by the inclusion of imprecision in our model of macroscopic measurements that we can prepare a system with two simultaneously well-defined quantities.
  arXiv  Detail & Related papers  (2020-03-04T14:01:17Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.