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

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 →

Weekly Papers on Quantum Foundations (1)

This is a list of this week’s papers on quantum foundations published in the various journals or uploaded to the preprint servers such as arxiv.org and PhilSci Archive. A formal framework for the study of the notion of undefined particle number in quantum mechanics Latest Results for Synthese on 2015-2-01 12:00am GMT Abstract It is usually stated that quantum mechanics… Read more →

Weak Values and Quantum Nonlocality

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

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 →

Weekly Papers on Quantum Foundations (52)

This is a list of this week’s papers on quantum foundations published in the various journals or uploaded to the preprint servers such as arxiv.org and PhilSci Archive. Beyond the cosmological standard model Physics Reports on 2014-12-26 10:09pm GMT Publication date: Available online 25 December 2014 Source:Physics Reports Author(s): Austin Joyce , Bhuvnesh Jain , Justin Khoury , Mark Trodden After… Read more →

Recollections of John Bell

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

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 →

What Retrocausal Explanations Look Like

Ken Wharton Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” While it is generally known that retrocausal models can provide an account of Bell-inequality violations in terms of spacetime-local beables, new models can now explicitly show how this comes about. By analyzing a simple local-beable model that precisely recovers the quantum joint probabilities for measurements on… Read more →

Weekly Papers on Quantum Foundations (51)

This is a list of this week’s papers on quantum foundations published in the various journals or uploaded to the preprint servers such as arxiv.org and PhilSci Archive. Quantum space-time of a charged black hole. (arXiv:1412.6055v1 [gr-qc]) gr-qc updates on arXiv.org on 2014-12-20 2:26am GMT Authors: Rodolfo Gambini, Esteban Mato Capurro, Jorge Pullin We quantize spherically symmetric electrovacuum gravity. The algebra of Hamiltonian… Read more →

Non-local beables

I would like to begin with Bell’s remark on the possibility that the beables are non-local, which Tim Maudlin quotes. “Of course, we may be obliged to develop theories in which there are no strictly local beables. That possibility will not be considered here[1].” When I read that yesterday I was astounded because it made me realize that ever since encountering Bell’s theorem as… Read more →