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Quantum theory is the most successful of all physical theories: it has a towering mathematical structure, a vast range of accurate predictions, and technological applications. Its interpretation, however, is as unsettled now as in the heroic days of Einstein and Bohr.

This book focuses on quantum non-locality, the curious quantum correlations between spatially separated systems. Quantum non-locality was one subject of the debates between Einstein, Bohr and others such as Schrödinger. The topic was revived in the 1960s as a result of Bell's epoch-making theorems; since then it has been a very active research field, both theoretically and experimentally.

This book contains twenty new papers by eminent researchers, who report recent developments in both the physics of the subject and its philosophy. The physics topics covered include quantum information, the unsharp (positive-operator) approach to observables, the state-space approach, and the pilot-wave theory. The philosophy papers include precise studies of Bohr's reply to the original Einstein-Podolsky-Rosen non-locality paradox, and of non-locality's relation to causation, probability and modality.

Non-locality and Modality

Preface.Part One: Re-Examining the Legacy of Bohr and von Neumann.Reconsidering Bohr's Reply to EPR; H. Halvorson, R. Clifton. Bohr on Bell: A Proposed Reading of Bohr and Its Implications for Bell's Theorem; M. Dickson. Bell, Bohm, and von Neumann: Some Philosophical Inequalities Concerning No-go Theorems and the Axiomatic Method; M. Stöltzner.Part Two: Interpreting Quantum Theory.Why Quantum Theory? L. Hardy. Quantum Mechanics of the Electric Charge and Its Connection with the Problem of Interpretation of Quantum Mechanics; A. Staruszkiewicz. Signal-Locality and Subquantum Information in Deterministic Hidden-Variables Theories; A. Valentini. Remarks on Space-time and Locality in Everett's Interpretation; G. Bacciagaluppi.art Three: Entanglement and Non-Locality.s Quantum Mechanics Non-Local? W.G. Unruh. Measuring Quantum Entanglement; L. Henderson. On Fine's Interpretation of Quantum Mechanics: GHZ Experiment; L.E. Szabó. Locality and Reality Revisited; A. Kent.Part Four: Unsharp Observables.EPR-Bell Tests with Unsharp Observables and Relativistic Quantum Measurement; P. Busch. A Kochen-Specker Theorem for Unsharp Spin 1 Observables; T. Breuer. The Bell Phenomenon in a Probabilistic Approach; E.G. Beltrametti, S. Bugajski.Part Five: Causation.Non-locality and Theories of Causation; F. Laudisa. On Causal Loops in the Quantum Realm; J. Berkovitz. Reichenbach's Common Cause Principle and Quantum Correlations; M. Rédei.Part Six: Branching Models of EPR Phenomena.Branching Space-Time, Modal Logic and the Counterfactual Conditional; T. Müller. EPR-like 'Funny Business' inthe Theory of Branching Space-times; N. Belnap. Partial Indeterminism Is Enough: a Branching Analysis of Bell-type Inequalities; T. Placek.Subject Index. Index of Names.