Received Papers

An additive Hamiltonian plus Landauer’s Principle yields quantum theory

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Chris Fields It is shown that no-signalling, a quantum of action, unitarity, detailed balance, Bell’s theorem, the Hilbert-space representation of physical states and the Born rule all follow from the assumption of an additive Hamiltonian together with Landauer’s principle. Common statements of the “classical limit” of quantum theory, as well as common assumptions made by “interpretations” of quantum theory, contradict additivity, Landauer’s principle, or both. Full… Read more →

Towards an Objective Physics of Bell Non-Locality: Palatial Twistor Theory

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Roger Penrose Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” In 1964, John Stewart Bell famously demonstrated that the laws of standard quantum mechanics demand a physical world that cannot be described entirely according to local laws.  The present article argues that this non-locality must be gravitationally related, as it comes about only with quantum state… Read more →

Lessons of Bell’s Theorem: Nonlocality, yes; Action at a distance, not necessarily.

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Wayne C. Myrvold Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” Fifty years after the publication of Bell’s theorem, there remains some controversy regarding what the theorem is telling us about quantum mechanics, and what the experimental violations of Bell inequalities are telling us about the world. This chapter represents my best attempt to be clear… Read more →

Reply to Norsen’s paper “Are there really two different Bell’s theorems?” (Open Review Paper)

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H. M. Wiseman Yes. That is my polemical reply to the titular question in Travis Norsen’s self-styled “polemical response to Howard Wiseman’s recent paper.” Less polemically, I am pleased to see that Norsen has made significant concessions on my position that Bell’s 1964 theorem is different from Bell’s 1976 theorem, and that the former does not include Bell’s one-paragraph heuristic presentation… Read more →

Bell Inequality and Many-Worlds Interpretation

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Lev Vaidman Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” It is argued that the lesson we should learn from Bell’s inequalities is not that quantum mechanics requires some kind of action at a distance, but that it leads us to believe in parallel worlds. Vaidman – Bell paper  

Protective measurements and the PBR theorem

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Guy Hetzroni and Daniel Rohrlich Forthcoming in Protective Measurement and Quantum Reality: Towards a New Understanding of Quantum Mechanics (CUP, 2015) Protective measurements illustrate how Yakir Aharonov’s fundamental insights into quantum theory yield new experimental paradigms that allow us to test quantum mechanics in ways that were not possible before. As for quantum theory itself, protective measurements demonstrate that a quantum… Read more →

Bell’s theorem without inequalities: on the inception and scope of the GHZ theorem

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Olival Freire Jr. and Osvaldo Pessoa Jr. Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” Since its inception, fifty years ago, Bell’s theorem has had a long history not only of experimental tests but also of theoretical developments. Studying pairs of correlated quantum-mechanical particles separated in space, in a composite “entangled” state, Bell (1964) showed that the… Read more →

Weak Values and Quantum Nonlocality

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Yakir Aharonov and Eliahu Cohen Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” Entanglement and nonlocality are studied in the framework of pre-/post-selected ensembles with the aid of weak measurements and the Two-State-Vector Formalism.  In addition to the EPR-Bohm experiment, we revisit the Hardy and Cheshire Cat experiments, whose entangled pre- or post-selected states give rise… Read more →

A reasonable thing that just might work

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Daniel Rohrlich Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” In 1964, John Bell proved that quantum mechanics is “unreasonable” (to use Einstein’s term):  there are nonlocal bipartite quantum correlations.  But they are not the most nonlocal bipartite correlations consistent with relativistic causality (“no superluminal signalling”):  also maximally nonlocal “superquantum” (or “PR-box”) correlations are consistent with… Read more →

Recollections of John Bell

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Michael Nauenberg Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” It is a pleasure to contribute to this anthology some of my recollections of John Bell. I first met him at SLAC, when we were visitors during 1964-65 when he was on leave from CERN, and I was on leave from the Columbia University Physics Department…. Read more →

The Assumptions of Bell’s Proof

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Roderich Tumulka Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” While it is widely agreed that Bell’s theorem is an important result in the foundations of quantum physics, there is much disagreement about what exactly Bell’s theorem shows. It is agreed that Bell derived a contradiction with experimental facts from some list of assumptions, thus showing… Read more →