Received Papers

A Rationalist Algorithmic Reconstruction of Quantum Mechanics

An attempt is made to reconstruct the postulates of quantum mechanics a priori from rationalist first principles, based on an algorithmic epistemology. The result, I suggest, is close enough to quantum mechanics to potentially serve as the basis for a consistent algorithmic interpretation of it. As a variation on the many worlds (or Everett) interpretation, such a framework provides a… Read more →

An additive Hamiltonian plus Landauer’s Principle yields quantum theory

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

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.

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 →

Protective measurements and the PBR theorem

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

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

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 →

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 →