## Quantum [Un]Speakables II: Half a Century of Bell's TheoremThis self-contained essay collection is published to commemorate half a century of Bell’s theorem. Like its much acclaimed predecessor “Quantum [Un]Speakables: From Bell to Quantum Information” (published 2002), it comprises essays by many of the worlds leading quantum physicists and philosophers. These revisit the foundations of quantum theory as well as elucidating the remarkable progress in quantum technologies achieved in the last couple of decades. Fundamental concepts such as entanglement, nonlocality and contextuality are described in an accessible manner and, alongside lively descriptions of the various theoretical and experimental approaches, the book also delivers interesting philosophical insights. The collection as a whole will serve as a broad introduction for students and newcomers as well as delighting the scientifically literate general reader. |

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### Contents

3 | |

5 | |

17 | |

Bells TheoremFundamental Issues | 81 |

4 Why QBism Is Not the Copenhagen Interpretation and What John Bell Might Have Thought of It | 83 |

5 On the Quantum Measurement Problem | 94 |

6 Causarum Investigatio and the Two Bells Theorems of John Bell | 119 |

7 Whose Information? Information About What? | 143 |

17 Black Box Quantum Mechanics | 307 |

18 Quantum Measurement of Spins and Magnets and the Classical Limit of PRBoxes | 320 |

19 The Dynamical Roles Played by Mass and Proper Time in Physics | 331 |

20 On Spatial Entanglement Wave Functions | 339 |

Entanglement Features | 342 |

21 Analysing Multiparticle Quantum States | 343 |

22 FewBody Entanglement Manipulation | 365 |

Neutron Interferometry | 381 |

Its Unreal | 155 |

A Quantum Physicists Reading of Aquinas | 166 |

10 Bells Theorem Tells Us Not What Quantum Mechanics Is but What Quantum Mechanics Is Not | 175 |

Contextuality | 186 |

11 The Unspeakable Why | 187 |

12 A Reconstruction of Quantum Mechanics | 201 |

Bell InequalitiesTheory | 236 |

13 A Quantum Mechanical Bound for CHSHType Bell Inequalities | 239 |

14 Bell Inequalities with Retarded Settings | 260 |

15 How to Avoid the Coincidence Loophole | 273 |

16 Bringing Bells Theorem Back to the Domain of Particle Physics and Cosmology | 291 |

Quantum Topics | 305 |

23 Search for Hidden Observables in Neutron Experiments | 383 |

24 What Does Quantum Theory Tell Us? A MatterWave Approach | 393 |

Bell InequalitiesExperiment | 412 |

25 Nonlocality and Quantum Cakes Revisited | 415 |

26 An Early LongDistance Quantum Experiment | 424 |

27 Quantum Information Experiments with FreeSpace Channels | 433 |

28 Bells Theorem Bell Inequalities and the Probability Normalization Loophole | 451 |

29 On Loopholes and Experiments | 485 |

The Role of Information | 502 |

Contributions to the Conference | 519 |

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Quantum [Un]Speakables II: Half a Century of Bell's Theorem Reinhold Bertlmann,Anton Zeilinger No preview available - 2016 |

### Common terms and phrases

algebra Alice and Bob Alice’s Anton Zeilinger apparatus assume assumption atoms beam Bell experiment Bell inequality Bell’s theorem Bob’s Bohm’s Bohr CAUSALITY CHSH inequality classical Clauser consider correlations corresponding decay defined definite detection detector deterministic discussed distribution dynamical Einstein entangled photons entanglement witness example expectation value experimental hidden variables Hilbert space interaction interferometer J.S. Bell John Bell Lett local realism locality LOCC transformations loophole macroscopic magnetic matrix maximally entangled neutron nonlocality observed operators outcome paper particle photon pairs photons Phys physicists polarization possible Postulate predictions principle probability problem properties protocol QBism quan quantum computation quantum cryptography quantum information quantum key distribution quantum measurement quantum mechanics quantum physics quantum system quantum theory Quantum Un]Speakables qubits R-inequality R.A. Bertlmann random realism RELATIVISTIC retarded settings separable Shimony signal spin symmetry teleportation tion University vector Vienna violation 𝜆 𝜎-algebra 𝜎-complex