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  1. Is the Reality Criterion Analytic?David Glick & Florian J. Boge - forthcoming - Erkenntnis:1-7.
    Tim Maudlin has claimed that EPR’s Reality Criterion is analytically true. We argue that it is not. Moreover, one may be a subjectivist about quantum probabilities without giving up on objective physical reality. Thus, would-be detractors must reject QBism and other epistemic approaches to quantum theory on other grounds.
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  • Quantum Information Versus Epistemic Logic: An Analysis of the Frauchiger–Renner Theorem.Florian J. Boge - 2019 - Foundations of Physics 49 (10):1143-1165.
    A recent no-go theorem (Frauchiger and Renner in Nat Commun 9(1):3711, 2018) establishes a contradiction from a specific application of quantum theory to a multi- agent setting. The proof of this theorem relies heavily on notions such as ‘knows’ or ‘is certain that’. This has stimulated an analysis of the theorem by Nurgalieva and del Rio (in: Selinger P, Chiribella G (eds) Proceedings of the 15th international conference on quantum physics and logic (QPL 2018). EPTCS 287, Open Publishing Association, Waterloo, (...)
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  • Reply to a Comment on “Quantum Theory and the Limits of Objectivity”.Richard Healey - 2019 - Foundations of Physics 49 (8):816-819.
    In this short note I reply to criticisms of an argument in my paper that appear in comment. Baumann et al. raise one “main criticism” then go on to claim that the argument of Healey contains a series of problems. But their “main criticism” is not an objection to the argument and the problems are of their own making.
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  • A New Objective Definition of Quantum Entanglement as Potential Coding of Intensive and Effective Relations.Christian de Ronde & Cesar Massri - unknown
    In this paper we consider the notion of quantum entanglement from the perspective of the logos categorical approach [13, 14]. In [16] we argued that the widespread distinction between separable states and entangled states is completely superfluous from a purely mathematical perspective. In this paper we attempt to discuss how the logos approach is able to provide not only an objective formal account of the notion of entanglement --completely independent of separability-- in terms of potential coding. For this purpose we (...)
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  • Comment on Healey’s “Quantum Theory and the Limits of Objectivity”.Veronika Baumann, Flavio Del Santo & Časlav Brukner - 2019 - Foundations of Physics 49 (7):741-749.
    In this comment we critically review an argument against the existence of objective physical outcomes, recently proposed by Healey [1]. We show that his gedankenexperiment, based on a combination of “Wigner’s friend” scenarios and Bell’s inequalities, suffers from the main criticism, that the computed correlation functions entering the Bell’s inequality are in principle experimentally inaccessible, and hence the author’s claim is in principle not testable. We discuss perspectives for fixing that by adapting the proposed protocol and show that this, however, (...)
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  • Wigner and His Many Friends: A New No-Go Result?Sebastian Fortin & Olimpia Lombardi - unknown
    In April 2016, Daniela Frauchiger and Renato Renner published an article online in which they introduce a Gedankenexperiment that led them to conclude that single-world interpretations of quantum theory cannot be self-consistent. In a new version of the paper, published in September 2018, the authors moderate their original claim by concluding that quantum theory cannot be extrapolated to complex systems, at least not in a straightforward manner. The purpose of this short article is to clarify the core of the F-R (...)
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  • A Simple Proof That the Many-Worlds Interpretation of Quantum Mechanics is Inconsistent.Shan Gao - unknown
    The many-worlds interpretation of quantum mechanics is based on three key assumptions: the completeness of the physical description by means of the wave function, the linearity of the dynamics for the wave function, and multiplicity. In this paper, I argue that the combination of these assumptions may lead to a contradiction. In order to avoid the contradiction, we must drop one of these key assumptions.
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  • Quantum Reality, Perspectivalism and Covariance.Dennis Dieks - 2019 - Foundations of Physics 49 (6):629-646.
    Paul Busch has emphasized on various occasions the importance for physics of going beyond a merely instrumentalist view of quantum mechanics. Even if we cannot be sure that any particular realist interpretation describes the world as it actually is, the investigation of possible realist interpretations helps us to develop new physical ideas and better intuitions about the nature of physical objects at the micro level. In this spirit, Paul Busch himself pioneered the concept of “unsharp quantum reality”, according to which (...)
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  • Are There Limits of Objectivity in the Quantum World?Shan Gao - unknown
    Healey recently argued that a version of the extended Wigner's friend Gedankenexperiment due to Masanes establishes a contradiction between the universal applicability of unitary quantum theory and the assumption of definite outcomes [Found. Phys. 48, 1568 ]. In this Comment, I show that Healey's analysis is problematic and his conclusion is not true.
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  • Unitary Quantum Theory is Incompatible with Special Relativity.Shan Gao - unknown
    It is shown that the combination of unitary quantum theory and special relativity may lead to a contradiction when considering the EPR correlations in different inertial frames in a Gedankenexperiment. This result seems to imply that either unitary quantum theory is wrong or if unitary quantum theory is right then there must exist a preferred Lorentz frame.
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