Accepted Papers

Reply to Gillis’s “On the Analysis of Bell’s 1964 Paper by Wiseman, Cavalcanti, and Rieffel” (Open Review Paper)

Howard M. Wiseman, Eleanor G. Rieffel and Eric Cavalcanti We address Gillis’ recent criticism of a series of papers (by different combinations of the present authors) on formulations of Bell’s theorem. Those papers intended to address an unfortunate gap of communication between two broad camps in the quantum foundations community that we identify as “operationalists” and “realists”. Here, we once again urge… Read more →

Concerning Quadratic Interaction in the Quantum Cheshire Cat Experiment

We believe the weak interaction of the quantum Cheshire Cat experiment must be linear if the weak values are to support the quantum Cheshire Cat interpretation, i.e., that a particle and one of its properties are spatially separated. For example, even though Denkmayr et al. measured the proper weak values for quantum Cheshire Cat in their neutron interferometry experiment, they did so using a quadratic… Read more →

Are Retrocausal Accounts of Entanglement Unnaturally Fine-Tuned?

D. Almada, K. Ch’ng, S. Kintner, B. Morrison and K.B. Wharton An explicit retrocausal model is used to analyze the general Wood-Spekkens argument [1] that any causal explanation of Bell-inequality violations must be unnaturally fine-tuned to avoid signaling. The no-signaling aspects of the model turn out to be robust under variation of the only free parameter, even as the probabilities… Read more →

A matter wave thought experiment concerning Galilean transformations

Yamaguchi Takeshi, Tokyo Institute of Technology The Schrödinger equation is invariant under Galilean transformations. Therefore, a matter wave should undergo the Doppler effect in the same manner as a classical wave and it should be observed when the measurement apparatus, i.e., the interferometer, moves with some velocity in the laboratory reference frame. Similarly, wave-like characteristics can be expected to appear if… Read more →

What’’s wrong with the wave function?

The call to supplement the wave function with local beables is almost as old as quantum mechanics. But what exactly is the problem with the wave function as the representation of a quantum system? I canvass three potential problems with the wave function: the well-known problems of incompleteness and dimensionality, and the lesser known problem of non-locality introduced recently by… Read more →

Derivation of quantum probabilities from deterministic evolution

T. G. Philbin Physics and Astronomy Department, University of Exeter, Stocker Road, Exeter EX4 4QL, United Kingdom The predictions of quantum mechanics are probabilistic. Quantum probabilities are extracted using a postulate of the theory called the Born rule, the status of which is central to the “measurement problem” of quantum mechanics. Efforts to justify the Born rule from other physical principles, and… Read more →

Submitted paper: Haag’s Theorem as a Reason to Reconsider Direct-Action Theories

ABSTRACT. It is argued that the severe consequences of Haag’s inconsistency theorem for quantum field theories can be successfully evaded in the direct-action approach. Some recent favorable comments of John Wheeler, often mistakenly presumed to have abandoned his own (and Feynman’s) direct-action theory, together with the remarkable immunity of direct-action quantum electrodynamics to Haag’s theorem, suggest that it may well… Read more →

A possible definition of a Realistic Physics Theory

Nicolas Gisin (University of Geneva) Submitted to “90 Years of Quantum Mechanics” A definition of a Realistic Physics Theory is proposed based on the idea that, at all time, the set of physical properties possessed (at that time) by a system should unequivocally determine the probabilities of outcomes of all possible measurements. Full text