Quantum, Probability, Logic

Brown, Harvey R.; Porath, Gal Ben

doi:10.1007/978-3-030-34316-3

Cited by 10 publications

(1 citation statement)

References 19 publications

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“…Thus, the transition between the two experimental contexts (captured by states |Ψ and |Ψ respectively) can be interpreted as an assumption about the location of Heisenberg's cut [2]. More precisely, it allows us to understand which apparatuses must be considered as observers -the 'ultimate measuring instruments' of Bohr [27], which verify Condition 1 -or included in the system described by quantum-mechanics [14,28].…”

Section: Discussionmentioning

confidence: 99%

Quantum erasing the memory of Wigner's friend

Elouard

Lewalle

Manikandan

et al. 2021

Quantum

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The Wigner's friend paradox concerns one of the most puzzling problems of quantum mechanics: the consistent description of multiple nested observers. Recently, a variation of Wigner's gedankenexperiment, introduced by Frauchiger and Renner, has lead to new debates about the self-consistency of quantum mechanics. At the core of the paradox lies the description of an observer and the object it measures as a closed system obeying the Schrödinger equation. We revisit this assumption to derive a necessary condition on a quantum system to behave as an observer. We then propose a simple single-photon interferometric setup implementing Frauchiger and Renner's scenario, and use the derived condition to shed a new light on the assumptions leading to their paradox. From our description, we argue that the three apparently incompatible properties used to question the consistency of quantum mechanics correspond to two logically distinct contexts: either one assumes that Wigner has full control over his friends' lab, or conversely that some parts of the labs remain unaffected by Wigner's subsequent measurements. The first context may be seen as the quantum erasure of the memory of Wigner's friend. We further show these properties are associated with observables which do not commute, and therefore cannot take well-defined values simultaneously. Consequently, the three contradictory properties never hold simultaneously.

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Section: Discussionmentioning

confidence: 99%

Quantum erasing the memory of Wigner's friend

Elouard

Lewalle

Manikandan

et al. 2021

Quantum

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Representation and the Quantum State

Healey

2022

Quantum Mechanics and Fundamentality

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Beyond Causal Explanation: Einstein’s Principle Not Reichenbach’s

Silberstein

Stuckey

McDevitt

2021

Entropy

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Our account provides a local, realist and fully non-causal principle explanation for EPR correlations, contextuality, no-signalling, and the Tsirelson bound. Indeed, the account herein is fully consistent with the causal structure of Minkowski spacetime. We argue that retrocausal accounts of quantum mechanics are problematic precisely because they do not fully transcend the assumption that causal or constructive explanation must always be fundamental. Unlike retrocausal accounts, our principle explanation is a complete rejection of Reichenbach’s Principle. Furthermore, we will argue that the basis for our principle account of quantum mechanics is the physical principle sought by quantum information theorists for their reconstructions of quantum mechanics. Finally, we explain why our account is both fully realist and psi-epistemic.

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Quantum, Probability, Logic

Cited by 10 publications

References 19 publications

Quantum erasing the memory of Wigner's friend

Quantum erasing the memory of Wigner's friend

Representation and the Quantum State

Beyond Causal Explanation: Einstein’s Principle Not Reichenbach’s

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