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  1. added 2018-06-18
    Quantum Nonlocality and Reality: 50 Years of Bell's Theorem.Mary Bell & Shan Gao (eds.) - 2016 - Cambridge University Press.
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  2. added 2018-04-13
    Can We Close the Bohr-Einstein Quantum Debate.Marian Kupczynski - 2017 - Philosophical Transactions of the Royal Society A 375:20160392..
    Recent experiments allowed concluding that Bell-type inequalities are indeed violated thus it is important to understand what it means and how can we explain the existence of strong correlations between outcomes of distant measurements. Do we have to announce that: Einstein was wrong, Nature is nonlocal and nonlocal correlations are produced due to the quantum magic and emerge, somehow, from outside space-time? Fortunately such conclusions are unfounded because if supplementary parameters describing measuring instruments are correctly incorporated in a theoretical model (...)
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  3. added 2018-03-30
    Recent Advances in Post-Quantum Physics.Jack Sarfatti - 2017 - Cosmos and History 13 (2):248-255.
  4. added 2018-02-17
    Quantum Frames.Matthew J. Brown - 2014 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 45:1-10.
    The framework of quantum frames can help unravel some of the interpretive difficulties i the foundation of quantum mechanics. In this paper, I begin by tracing the origins of this concept in Bohr's discussion of quantum theory and his theory of complementarity. Engaging with various interpreters and followers of Bohr, I argue that the correct account of quantum frames must be extended beyond literal space–time reference frames to frames defined by relations between a quantum system and the exosystem or external (...)
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  5. added 2018-02-17
    What Econometrics Cannot Teach Quantum Mechanics.Joseph Berkovitz - 1995 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 26 (2):163-200.
    Cartwright and Humphreys have suggested theories of probabilistic causation for singular events, which are based on modifications of traditional causal linear modelling. On the basis of her theory, Cartwright offered an allegedly local, and non-factorizable, common-cause model for the EPR experiment. In this paper I consider Cartwright's and Humphreys' theories. I argue that, provided plausible assumptions obtain, local models for EPR in the framework of these theories are committed to Bell inequalities, which are violated by experiment.
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  6. added 2018-02-16
    Toy Models for Retrocausality.Huw Price - 2008 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 39 (4):752-761.
    Forthcoming in Studies in History and Philosophy of Modern Physics, 39(2008).
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  7. added 2017-09-27
    Spooky Action at a Distance: The Puzzle of Entanglement in Quantum Theory.Alan Macdonald - manuscript
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  8. added 2017-09-27
    Comment on "Resolution of the Einstein-Podolsky-Rosen and Bell Paradoxes".Alan Macdonald - 1982 - Physical Review Letters 49.
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  9. added 2017-02-15
    Parity Proofs of the Kochen–Specker Theorem Based on the 120-Cell.Mordecai Waegell & P. K. Aravind - 2014 - Foundations of Physics 44 (10):1085-1095.
    It is shown how the 300 rays associated with the antipodal pairs of vertices of a 120-cell (a four-dimensional regular polytope) can be used to give numerous “parity proofs” of the Kochen–Specker theorem ruling out the existence of noncontextual hidden variables theories. The symmetries of the 120-cell are exploited to give a simple construction of its Kochen–Specker diagram, which is exhibited in the form of a “basis table” showing all the orthogonalities between its rays. The basis table consists of 675 (...)
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  10. added 2017-02-14
    Local and Non-Local Aspects of Quantum Gravity.H. -H. V. Borzeszkowski, B. K. Datta, V. De Sabbata, L. Ronchetti & H. -J. Treder - 2002 - Foundations of Physics 32 (11):1701-1716.
  11. added 2017-02-14
    Quantum Non-Locality and the Challenge to Scientific Realism.Kristofer Noris - 1999 - Theoria 42 (1-2):37-63.
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  12. added 2017-02-13
    Atomic-Cascade Photons and Quantum-Mechanical Nonlocality.J. S. Bell - 2004 - In Speakable and Unspeakable in Quantum Mechanics. Cambridge University Press. pp. 105--110.
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  13. added 2017-02-13
    On the Problem of Hidden Variables in Quantum Mechanics.J. S. Bell - 2004 - In Speakable and Unspeakable in Quantum Mechanics. Cambridge University Press. pp. 1--13.
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  14. added 2017-02-13
    The Locality Scandal of Quantum Mechanics.F. A. Muller - 1999 - In Maria Luisa Dalla Chiara (ed.), Language, Quantum, Music. pp. 241--248.
  15. added 2017-02-13
    Can the Experiments Based on Parametric-Down Conversion Disprove Einstein Locality?Augusto Garuccio - 1995 - In M. Ferrero & A. van der Merwe (eds.), Fundamental Problems in Quantum Physics. pp. 103--112.
  16. added 2017-02-13
    Outcome Dependence and Stochastic Einstein Nonlocality.Jeremy Butterfield - 1994 - In Dag Prawitz & Dag Westerståhl (eds.), Logic and Philosophy of Science in Uppsala. Kluwer Academic Publishers. pp. 385--424.
  17. added 2017-02-13
    Holism, Separability, and the Metaphysical Implications of the Bell Experiments.Don Howard - 1989 - In James T. Cushing & Ernan McMullin (eds.), Philosophical Consequences of Quantum Theory. University of Notre Dame Press. pp. 224--253.
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  18. added 2017-02-13
    The Locality Problem in Quantum Mechanics'.L. Nelson - 1986 - In Daniel M. Greenberger (ed.), New Techniques and Ideas in Quantum Measurement Theory. New York Academy of Sciences.
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  19. added 2017-02-12
    Comment On: Nonlocal “Realistic” Leggett Models Can Be Considered Refuted by the Before-Before Experiment.Marek Żukowski - 2008 - Foundations of Physics 38 (11):1070-1071.
    It is shown here that Suarez (Found. Phys. 38:583, 2008) wrongly presents the assumptions behind the Leggett’s inequalities, and their modified form used by Groeblacher et al. (Nature 446:871, 2007) for an experimental falsification of a certain class of non-local hidden variable models.
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  20. added 2017-02-12
    Quantum Non‐Locality and Relativity.Francisco Flores - 1996 - Philosophical Books 37 (1):74-77.
  21. added 2017-02-12
    Comment on “Nonlocal Character of the Rastall Model”.Peter Rastall - 1989 - Foundations of Physics 19 (6):783-783.
    The new arguments in the cited paper are shown to be as unsatisfactory as the old.
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  22. added 2017-02-12
    Incompleteness, Non Locality and Realism: A Prolegomenon to the Philosophy of Quantum Mechanics.Peter Gibbins - 1988 - Philosophical Books 29 (2):117-118.
  23. added 2017-02-12
    Quantum Nonlocality.Henry P. Stapp - 1988 - Foundations of Physics 18 (4):427-448.
    It is argued that the validity of the predictions of quantum theory in certain spincorrelation experiments entails a violation of Einstein's locality idea that no causal influence can act outside the forward light cone. First, two preliminary arguments suggesting such a violation are reviewed. They both depend, in intermediate stages, on the idea that the results of certain unperformed experiments are physically determinate. The second argument is entangled also with the problem of the meaning of “physical reality.” A new argument (...)
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  24. added 2017-02-12
    Higher-Order Tensors and Tests of Quantum Mechanics.S. Bergia & F. Cannata - 1982 - Foundations of Physics 12 (9):843-859.
    We illustrate a generalization of Bell's inequality which is not limited to spin-1/2 or photon systems and does not depend on model-dependent assumptions. We then construct a specific class of examples, in terms of the decaying state and the correlated observables to be measured on the decay products, for which this inequality is violated by quantum mechanics. Finally we discuss the basic and practical problems involved in the measurement of these correlations.
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  25. added 2017-02-12
    Locality and Reality.Henry P. Stapp - 1980 - Foundations of Physics 10 (9-10):767-795.
    Einstein's principle that no signal travels faster than light suggests that observations in one spacetime region should not depend on whether or not a radioactive decay is detected in a spacelike-separated region. This locality property is incompatible with the predictions of quantum theory, and this incompatibility holds independently of the questions of realism, objective reality, and hidden variables. It holds both in the pragmatic quantum theory of Bohr and in realistic frameworks. It is shown here to hold in a completed (...)
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  26. added 2017-02-11
    Hardy's Non-Locality Paradox and Possibilistic Conditions for Non-Locality.Shane Mansfield & Tobias Fritz - 2012 - Foundations of Physics 42 (5):709-719.
    Hardy’s non-locality paradox is a proof without inequalities showing that certain non-local correlations violate local realism. It is ‘possibilistic’ in the sense that one only distinguishes between possible outcomes (positive probability) and impossible outcomes (zero probability). Here we show that Hardy’s paradox is quite universal: in any (2,2,l) or (2,k,2) Bell scenario, the occurrence of Hardy’s paradox is a necessary and sufficient condition for possibilistic non-locality. In particular, it subsumes all ladder paradoxes. This universality of Hardy’s paradox is not true (...)
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  27. added 2017-02-11
    Experimental Evidence for a Dynamical Non-Locality Induced Effect in Quantum Interference Using Weak Values.S. E. Spence & A. D. Parks - 2012 - Foundations of Physics 42 (6):803-815.
    The quantum theoretical concepts of modular momentum and dynamical non-locality, which were introduced four decades ago, have recently been used to explain single particle quantum interference phenomena. Although the non-local exchange of modular momentum associated with such phenomena cannot be directly observed, it has been suggested that effects induced by this exchange can be measured experimentally using weak measurements of pre- and post-selected ensembles of particles. This paper reports on such an optical experiment that yielded measured weak values that were (...)
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  28. added 2017-02-11
    Hidden Variables with Nonlocal Time.Hrvoje Nikolić - 2012 - Foundations of Physics 42 (5):632-646.
    To relax the apparent tension between nonlocal hidden variables and relativity, we propose that the observable proper time is not the same quantity as the usual proper-time parameter appearing in local relativistic equations. Instead, the two proper times are related by a nonlocal rescaling parameter proportional to |ψ|2, so that they coincide in the classical limit. In this way particle trajectories may obey local relativistic equations of motion in a manner consistent with the appearance of nonlocal quantum correlations. To illustrate (...)
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  29. added 2017-02-11
    Realism and Single-Quanta Nonlocality.G. S. Paraoanu - 2011 - Foundations of Physics 41 (4):734-743.
    We show that local realism applied to states characterized by a single quantum equally and coherently shared between a number of qubits (so-called W states) produces predictions incompatible with quantum theory. The origin of this incompatibility is shown to originate from the destructive interference of amplitude probabilities associated with nonlocal states, a phenomenon that has no classical analog.
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  30. added 2017-02-11
    Quantum Analogues of Hardy's Nonlocality Paradox.Tobias Fritz - 2011 - Foundations of Physics 41 (9):1493-1501.
    Hardy’s nonlocality is a “nonlocality proof without inequalities”: it exemplifies that quantum correlations can be qualitatively stronger than classical correlations. This paper introduces variants of Hardy’s nonlocality in the CHSH scenario which are realized by the PR-box, but not by quantum correlations. Hence this new kind of Hardy-type nonlocality is a proof without inequalities showing that superquantum correlations can be qualitatively stronger than quantum correlations.
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  31. added 2017-02-11
    Quantum Nonlocality: Not Eliminated by the Heisenberg Picture. [REVIEW]Ruth E. Kastner - 2011 - Foundations of Physics 41 (7):1137-1142.
    It is argued that the Heisenberg picture of standard quantum mechanics does not save Einstein locality as claimed in Deutsch and Hayden (Proc. R. Soc. Lond. A 456, 1759–1774, 2000). In particular, the EPR-type correlations that the authors obtain by comparing two qubits in a local manner are shown to exist before that comparison. In view of this result, the local comparison argument would appear to be ineffective in supporting their locality claim.
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  32. added 2017-02-11
    Von Neumann's 'No Hidden Variables' Proof: A Re-Appraisal. [REVIEW]Jeffrey Bub - 2010 - Foundations of Physics 40 (9-10):1333-1340.
    Since the analysis by John Bell in 1965, the consensus in the literature is that von Neumann’s ‘no hidden variables’ proof fails to exclude any significant class of hidden variables. Bell raised the question whether it could be shown that any hidden variable theory would have to be nonlocal, and in this sense ‘like Bohm’s theory.’ His seminal result provides a positive answer to the question. I argue that Bell’s analysis misconstrues von Neumann’s argument. What von Neumann proved was the (...)
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  33. added 2017-02-11
    Operational Independence and Operational Separability in Algebraic Quantum Mechanics.Miklós Rédei - 2010 - Foundations of Physics 40 (9-10):1439-1449.
    Recently, new types of independence of a pair of C *- or W *-subalgebras (1,2) of a C *- or W *-algebra have been introduced: operational C *- and W *-independence (Rédei and Summers, http://arxiv.org/abs/0810.5294, 2008) and operational C *- and W *-separability (Rédei and Valente, How local are local operations in local quantum field theory? 2009). In this paper it is shown that operational C *-independence is equivalent to operational C *-separability and that operational W *-independence is equivalent to (...)
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  34. added 2017-02-11
    Objectivity Vs. Locality in Quantum Physics.Ernst-Walther Stachow - 2010 - Foundations of Physics 40 (9-10):1450-1475.
    An Objectivity Principle (O) and a Locality Principle (L) are considered with respect to two simple, but fundamental Gedanken experiments, namely a “Welcher-Weg” Gedanken experiment and an Einstein-Podolsky-Rosen (EPR) Gedanken experiment. It is shown that, if both principles (O) and (L) are assumed to be valid, a contradiction, in the EPR case Bell’s inequality, can be derived implying that at least one of the two principles (O) and (L) has to be denied. It is shown that, if (O) is denied, (...)
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  35. added 2017-02-11
    Contextuality and Nonlocality in 'No Signaling' Theories.Jeffrey Bub & Allen Stairs - 2009 - Foundations of Physics 39 (7):690-711.
    We define a family of ‘no signaling’ bipartite boxes with arbitrary inputs and binary outputs, and with a range of marginal probabilities. The defining correlations are motivated by the Klyachko version of the Kochen-Specker theorem, so we call these boxes Kochen-Specker-Klyachko boxes or, briefly, KS-boxes. The marginals cover a variety of cases, from those that can be simulated classically to the superquantum correlations that saturate the Clauser-Horne-Shimony-Holt inequality, when the KS-box is a generalized PR-box (hence a vertex of the ‘no (...)
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  36. added 2017-02-11
    Contextuality, Nonlocality and Counterfactual Arguments.Gian Carlo Ghirardi & Karl Wienand - 2009 - Foundations of Physics 39 (7):776-789.
    In this paper, following an elementary line of thought which somewhat differs from the usual one, we prove once more that any deterministic theory predictively equivalent to quantum mechanics unavoidably exhibits a contextual character. The purpose of adopting this perspective is that of paving the way for a critical analysis of the use of counterfactual arguments when dealing with nonlocal physical processes.
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  37. added 2017-02-11
    Nonlocal “Realistic” Leggett Models Can Be Considered Refuted by the Before-Before Experiment.Antoine Suarez - 2008 - Foundations of Physics 38 (6):583-589.
    Nonlocal “realistic” Leggett models can be considered refuted by the before-before experiment. “Single preferred frame” models are not refuted by this experiment but bear severe oddities.
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  38. added 2017-02-11
    Relational EPR.Matteo Smerlak & Carlo Rovelli - 2007 - Foundations of Physics 37 (3):427-445.
    We study the EPR-type correlations from the perspective of the relational interpretation of quantum mechanics. We argue that these correlations do not entail any form of “non-locality”, when viewed in the context of this interpretation. The abandonment of strict Einstein realism implied by the relational stance permits to reconcile quantum mechanics, completeness, (operationally defined) separability, and locality.
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  39. added 2017-02-11
    Solomon's Argument on Hidden Variables in Quantum Theory.M. A. B. Whitaker - 2007 - Foundations of Physics 37 (6):989-997.
    J. Solomon [Journal de Physique 4, 34 (1933)] produced an argument of great generality claiming to demonstrate the impossibility of hidden variables in quantum theory, an argument which M. Jammer [The Philosophy of Quantum Mechanics(Wiley, New York, 1974)] said raised a number of questions. For the first time, this argument is discussed, a simple hidden variable model violating the argument is analysed in detail, and the error in the proof is located.
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  40. added 2017-02-11
    Observables Have No Value: A No-Go Theorem for Position and Momentum Observables. [REVIEW]Alberto C. De la Torre - 2007 - Foundations of Physics 37 (8):1243-1252.
    The Bell–Kochen–Specker contradiction is presented using continuous observables in infinite dimensional Hilbert space. It is shown that the assumption of the existence of putative values for position and momentum observables for one single particle is incompatible with quantum mechanics.
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  41. added 2017-02-11
    The Wigner Function as Distribution Function.M. Revzen - 2006 - Foundations of Physics 36 (4):546-562.
    Some entangled states have nonnegative Wigner representative function. The latter allow being viewed as a distribution function of local hidden variables. It is argued herewith that the interpretation of expectation values using such distribution functions as local hidden variable theory requires restrictions pertaining to the observables under study. The reasoning lead to support the view that violation of Bell’s inequalities that is always possible for entangled states hinges not only on the states involved but also whether the dynamical variables have (...)
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  42. added 2017-02-11
    On the Consequences of Retaining the General Validity of Locality in Physical Theory.W. De Baere - 2005 - Foundations of Physics 35 (1):33-56.
    The empirical validity of the locality (LOC) principle of relativity is used to argue in favour of a local hidden variable theory (HVT) for individual quantum processes. It is shown that such a HVT may reproduce the statistical predictions of quantum mechanics (QM), provided the reproducibility of initial hidden variable states is limited. This means that in a HVT limits should be set to the validity of the notion of counterfactual definiteness (CFD). This is supported by the empirical evidence that (...)
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  43. added 2017-02-11
    Non-Local Interferometry: A Causal Explanation by Means of Local Wavelet Analysis. [REVIEW]J. Marto & J. R. Croca - 2002 - Foundations of Physics 32 (7):1091-1109.
    In the following we consider the possibility of interpretating recent non-local interferometric experiments according to the De Broglie causal model. With the help of a simplified mathematical model based on wavelet analysis it is indeed possible to explain it in a causal way. Furthermore we show the distinctions between the two formalisms and discuss some experimental conditions that may make these differences evident.
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  44. added 2017-02-11
    Hidden Variables and Bell Inequalities on Quantum Logics.Sylvia Pulmannová - 2002 - Foundations of Physics 32 (2):193-216.
    In the quantum logic approach, Bell inequalities in the sense of Pitowski are related with quasi hidden variables in the sense of Deliyannis. Some properties of hidden variables on effect algebras are discussed.
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  45. added 2017-02-11
    Locality in the Everett Interpretation of Quantum Field Theory.Mark A. Rubin - 2002 - Foundations of Physics 32 (10):1495-1523.
    Recently it has been shown that transformations of Heisenberg-picture operators are the causal mechanism which allows Bell-theorem-violating correlations at a distance to coexist with locality in the Everett interpretation of quantum mechanics. A calculation to first order in perturbation theory of the generation of EPRB entanglement in nonrelativistic fermionic field theory in the Heisenberg picture illustrates that the same mechanism leads to correlations without nonlocality in quantum field theory as well. An explicit transformation is given to a representation in which (...)
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  46. added 2017-02-11
    Nonlocality in Relativistic Dynamics.John R. Fanchi - 2001 - Foundations of Physics 31 (9):1267-1285.
    Recent experiments have renewed interest in nonlocal interpretations of quantum mechanics. The experimental observation of the violation of Bell's inequalities implies the existence of nonlocality. Bohm expressed the nonlocal connection between quantum particles through the wave function and the quantum potential. This paper shows that a similar connection exists in a relativistic dynamical theory known as parametrized relativistic quantum theory (PRQT). We present an introduction to PRQT, derive the quantum potential for a system of relativistic scalar particles, and discuss alternative (...)
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  47. added 2017-02-11
    Non-Locality in Electrodynamics.I. Antoniou, E. Karpov & G. Pronko - 2001 - Foundations of Physics 31 (11):1641-1655.
    We investigate the applicability of Hegerfeldts arguments on Quantum nonlocality in Quantum Electrodynamics following the work of Prigogine, Pronko, Petrosky, Ordonez and Karpov. We demonstrate the appearance of nonlocal effects at the level of quantum states. We show, however that the expectation values of some observables spread causally. Therefore the measurement of the nonlocality is questionable. We investigate an approach to classical measurement and conclude that the classical measurement cannot detect the “acausal” effects of the non-locality.
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  48. added 2017-02-11
    Nonlocality of Some Factorable Quantum Mechanical State Vectors.Augusto Garuccio, Ramón Risco-Delgado & Franco Selleri - 2000 - Foundations of Physics 30 (2):321-330.
    By following the analysis of De Caro and Garuccio [Phys. Rev. A 54, 174 (1996)], we show that the factorable state vector produced with a beam-splitter set on the paths of parametric down-converted photons violates some new inequalities that we deduce from local realism. These inequalities are more stringent than those used up to now in the discussion of such phenomena.
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  49. added 2017-02-11
    Stronger-Than-Quantum Correlations.G. Krenn & K. Svozil - 1998 - Foundations of Physics 28 (6):971-984.
    After an elementary derivation of Bell's inequality, classical, quantum mechanical, and stronger-than-quantum correlation functions for 2-particle-systems are discussed. Special functions are investigated which give rise to an extreme violation of Bell's inequality by the value of 4. Referring to a specific quantum system it is shown that under certain conditions such an extreme violation would contradict basic laws of physics.
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  50. added 2017-02-11
    Quantum Nonlocality as an Axiom.Sandu Popescu & Daniel Rohrlich - 1994 - Foundations of Physics 24 (3):379-385.
    In the conventional approach to quantum mechanics, indeterminism is an axiom and nonlocality is a theorem. We consider inverting the logical order, making nonlocality an axiom and indeterminism a theorem. Nonlocal “superquantum” correlations, preserving relativistic causality, can violate the CHSH inequality more strongly than any quantum correlations.
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