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Summary Traditional formulations of quantum mechanics rely on an unanalysed concept of measurement. Quantum systems are treated as evolving via the unitary Schrodinger evolution, except when they are measured or observed; then, all components of the state are discarded except the one corresponding to the actual measurement result. The component which remains is then regarded as the new state of the system and again is evolved forwards according to the unitary evolution. The measurement problem is the problem of explaining why this two-stage procedure employing a primitive concept of measurement works so well.
Key works Bell 2004 contains a number of exceptionally clear discussions of the measurement problem. Bohr 1935 contains the first explicit claim that measurement plays a fundamental role in quantum theory.
Introductions Albert 1992
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  1. added 2020-03-11
    Reformulating Bell's Theorem: The Search for a Truly Local Quantum Theory.Mordecai Waegell & Kelvin J. McQueen - 2020 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 70:39-50.
    The apparent nonlocality of quantum theory has been a persistent concern. Einstein et al. and Bell emphasized the apparent nonlocality arising from entanglement correlations. While some interpretations embrace this nonlocality, modern variations of the Everett-inspired many worlds interpretation try to circumvent it. In this paper, we review Bell's "no-go" theorem and explain how it rests on three axioms, local causality, no superdeterminism, and one world. Although Bell is often taken to have shown that local causality is ruled out by the (...)
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  2. added 2020-03-11
    In Defence of the Self-Location Uncertainty Account of Probability in the Many-Worlds Interpretation.Kelvin J. McQueen & Lev Vaidman - 2019 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 66:14-23.
    We defend the many-worlds interpretation of quantum mechanics against the objection that it cannot explain why measurement outcomes are predicted by the Born probability rule. We understand quantum probabilities in terms of an observer's self-location probabilities. We formulate a probability postulate for the MWI: the probability of self-location in a world with a given set of outcomes is the absolute square of that world's amplitude. We provide a proof of this postulate, which assumes the quantum formalism and two principles concerning (...)
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  3. added 2020-02-11
    Studies in the Foundations of Quantum Mechanics.Allen Stairs - 1982 - Philosophy of Science 49 (3):481-484.
  4. added 2019-12-26
    Putting Probabilities First. How Hilbert Space Generates and Constrains Them.Michael Janas, Michael Cuffaro & Michel Janssen - manuscript
    We use Bub's (2016) correlation arrays and Pitowksy's (1989b) correlation polytopes to analyze an experimental setup due to Mermin (1981) for measurements on the singlet state of a pair of spin-12 particles. The class of correlations allowed by quantum mechanics in this setup is represented by an elliptope inscribed in a non-signaling cube. The class of correlations allowed by local hidden-variable theories is represented by a tetrahedron inscribed in this elliptope. We extend this analysis to pairs of particles of arbitrary (...)
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  5. added 2019-06-06
    Decision Theory and Information Propagation in Quantum Physics.Alan Forrester - 2007 - Studies in History and Philosophy of Modern Physics 38 (4):815-831.
    In recent papers, Zurek [(2005). Probabilities from entanglement, Born's rule pk=|ψk|2 from entanglement. Physical Review A, 71, 052105] has objected to the decision-theoretic approach of Deutsch [(1999) Quantum theory of probability and decisions. Proceedings of the Royal Society of London A, 455, 3129–3137] and Wallace [(2003). Everettian rationality: defending Deutsch's approach to probability in the Everett interpretation. Studies in History and Philosophy of Modern Physics, 34, 415–438] to deriving the Born rule for quantum probabilities on the grounds that it courts (...)
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  6. added 2019-06-06
    The Foundations of Quantum Mechanics in the Philosophy of Nature.Grete Hermann & Dirk Lumma - 1999 - The Harvard Review of Philosophy 7 (1):35-44.
    The following article by Grete Hermann arguably occupies an important place in the history of the philosophical interpretation of of quantum mechanics. The purpose of Hermann's writing on natural philosophy is to examine the revision of the law of causality which quantum mechanics seems to require at a fundamental level of theoretical description in physics. It is Hermann's declared intention to show that quantum mechanics does not disprove the concept of causality, "yet has clarified [it] and has removed from it (...)
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  7. added 2019-06-06
    Review. Peter Mittelstaedt. The Interpretation of Quantum Mechanics and the Measurement Process. Cambridge University Press, 1998. [REVIEW]Douglas Kutach - 1998 - British Journal for the Philosophy of Science 49 (4):649-651.
    Book review of The Interpretation of Quantum Mechanics and the Measurement Process.
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  8. added 2019-06-05
    Quantum Theory and Measurement. John Archibald Wheeler, Wojciech Hubert Zurek.Nancy Cartwright - 1985 - Philosophy of Science 52 (3):480-481.
  9. added 2019-03-08
    Predictions and Primitive Ontology in Quantum Foundations: A Study of Examples.Valia Allori, Sheldon Goldstein, Roderich Tumulka & Nino Zanghi - 2014 - British Journal for the Philosophy of Science 65 (2):323-352.
    A major disagreement between different views about the foundations of quantum mechanics concerns whether for a theory to be intelligible as a fundamental physical theory it must involve a ‘primitive ontology’ (PO), i.e. variables describing the distribution of matter in four-dimensional space–time. In this article, we illustrate the value of having a PO. We do so by focusing on the role that the PO plays for extracting predictions from a given theory and discuss valid and invalid derivations of predictions. To (...)
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  10. added 2019-03-07
    Ψ-Epistemic Quantum Cosmology?Peter W. Evans, Sean Gryb & Karim P. Y. Thébault - 2016 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 56:1-12.
    This paper provides a prospectus for a new way of thinking about the wavefunction of the universe: a Ψ-epistemic quantum cosmology. We present a proposal that, if successfully implemented, would resolve the cosmological measurement problem and simultaneously allow us to think sensibly about probability and evolution in quantum cosmology. Our analysis draws upon recent work on the problem of time in quantum gravity and causally symmet- ric local hidden variable theories. Our conclusion weighs the strengths and weaknesses of the approach (...)
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  11. added 2019-01-28
    Simon Friederich: Interpreting Quantum Theory: A Therapeutic Approach: Palgrave Macmillan, New York, 2015, Xiii + 202 Pp. [REVIEW]Florian Boge - 2017 - Erkenntnis 82 (2):443-449.
    Simon Friederich’s Therapeutic Approach to quantum theory (QT) sheds new light on the status of the quantum state. In particular, Friederich presents revisionary ideas on how to exactly differentiate objective from subjective elements of the theory and thereby improves upon previous stabs at an epistemic interpretation of quantum states. The book not only provides interesting perspectives for the cognoscenti but is also written with sufficient care and free of unnecessary technicalities so as to be accessible and worth reading for the (...)
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  12. added 2019-01-22
    Reality and the Probability Wave.Daniel Shanahan - 2019 - International Journal of Quantum Foundations 5:51-68.
    Effects associated in quantum mechanics with a divisible probability wave are explained as physically real consequences of the equal but opposite reaction of the apparatus as a particle is measured. Taking as illustration a Mach-Zehnder interferometer operating by refraction, it is shown that this reaction must comprise a fluctuation in the reradiation field of complementary effect to the changes occurring in the photon as it is projected into one or other path. The evolution of this fluctuation through the experiment will (...)
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  13. added 2018-06-25
    Quantum Theory is Not Only About Information.Laura Felline - 2018 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics.
    In his recent book Bananaworld. Quantum mechanics for primates, Jeff Bub revives and provides a mature version of his influential information-theoretic interpretation of Quantum Theory (QT). In this paper, I test Bub’s conjecture that QT should be interpreted as a theory about information, by examining whether his information-theoretic interpretation has the resources to explain (or explain away) quantum conundrums. The discussion of Bub’s theses will also serve to investigate, more in general, whether other approaches succeed in defending the claim that (...)
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  14. added 2018-06-19
    Quantum Mechanics Between Ontology and Epistemology.Florian J. Boge - 2018 - Springer (European Studies in Philosophy of Science).
    This book explores the prospects of rivaling ontological and epistemic interpretations of quantum mechanics (QM). It concludes with a suggestion for how to interpret QM from an epistemological point of view and with a Kantian touch. It thus refines, extends, and combines existing approaches in a similar direction. -/- The author first looks at current, hotly debated ontological interpretations. These include hidden variables-approaches, Bohmian mechanics, collapse interpretations, and the many worlds interpretation. He demonstrates why none of these ontological interpretations can (...)
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  15. added 2018-03-05
    Kantian and Neo-Kantian First Principles for Physical and Metaphysical Cognition.Michael E. Cuffaro - manuscript
    I argue that Immanuel Kant's critical philosophy—in particular the doctrine of transcendental idealism which grounds it—is best understood as an `epistemic' or `metaphilosophical' doctrine. As such it aims to show how one may engage in the natural sciences and in metaphysics under the restriction that certain conditions are imposed on our cognition of objects. Underlying Kant's doctrine, however, is an ontological posit, of a sort, regarding the fundamental nature of our cognition. This posit, sometimes called the `discursivity thesis', while considered (...)
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  16. added 2018-02-17
    The Emergent Multiverse: Quantum Theory According to the Everett Interpretation.David Wallace - 2012 - Oxford University Press.
    David Wallace argues that we should take quantum theory seriously as an account of what the world is like--which means accepting the idea that the universe is constantly branching into new universes. He presents an accessible but rigorous account of the 'Everett interpretation', the best way to make coherent sense of quantum physics.
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  17. added 2018-02-17
    Does Probabilism Solve the Great Quantum Mystery?Nicholas Maxwell - 2004 - Theoria: Revista de Teoría, Historia y Fundamentos de la Ciencia 19 (3):321-336.
    What sort of entities are electrons, photons and atoms given their wave-like and particle-like properties? Is nature fundamentally deterministic or probabilistic? Orthodox quantum theory evades answering these two basic questions by being a theory about the results of performing measurements on quantum systems. But this evasion results in OQT being a seriously defective theory. A rival, somewhat ignored strategy is to conjecture that the quantum domain is fundamentally probabilistic. This means quantum entities, interacting with one another probabilistically, must differ radically (...)
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  18. added 2018-02-17
    A Phenomenological Solution to the Measurement Problem? Husserl and the Foundations of Quantum Mechanics.Steven French - 2002 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 33 (3):467-491.
    The London and Bauer monograph occupies a central place in the debate concerning the quantum measurement problem. Gavroglu has previously noted the influence of Husserlian phenomenology on London's scientific work. However, he has not explored the full extent of this influence in the monograph itself. I begin this paper by outlining the important role played by the monograph in the debate. In effect, it acted as a kind of 'lens' through which the standard, or Copenhagen, 'solution' to the measurement problem (...)
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  19. added 2018-02-16
    Operation Quantum Physics.Gordon N. Fleming - 2000 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 31 (1):117-125.
  20. added 2017-12-18
    Grete Hermann - Between Physics and Philosophy.Elise Crull & Guido Bacciagaluppi (eds.) - 2016 - Springer.
  21. added 2017-10-17
    Book Review of S. Gao "Protective Measurement and Quantum Reality". [REVIEW]Valia Allori - 2017 - British Journal for the Philosophy of Science:x-y.
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  22. added 2017-09-22
    Quantum Mechanics in Terms of Realism.Arthur Jabs - 2017 - arXiv.Org.
    We expound an alternative to the Copenhagen interpretation of the formalism of nonrelativistic quantum mechanics. The basic difference is that the new interpretation is formulated in the language of epistemological realism. It involves a change in some basic physical concepts. The ψ function is no longer interpreted as a probability amplitude of the observed behaviour of elementary particles but as an objective physical field representing the particles themselves. The particles are thus extended objects whose extension varies in time according to (...)
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  23. added 2017-09-11
    Philosophical Problems of Quantum Ontology.Graeme Donald Robertson - 1976 - Dissertation, Cambridge
    What is a physical object according to the theory of quantum mechanics? The first answer to be considered is that given by Bohr in terms of the concept of complementarity. This interpretation is illustrated by way of an example, the two slit experiment, which highlights some of the associated problems of ontology. One such problem is the so-called problem of measurement or observation. Various interpretations of measurement in Quantum Theory, including those of Heisenberg, von Neumann, Everett and Bohr, are compared (...)
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  24. added 2017-07-07
    Is QBism the Future of Quantum Physics? [REVIEW]Kelvin McQueen - 2017 - Quantum Times 2017.
    The purpose of this book is to explain Quantum Bayesianism (‘QBism’) to “people without easy access to mathematical formulas and equations” (4-5). Qbism is an interpretation of quantum mechanics that “doesn’t meddle with the technical aspects of the theory [but instead] reinterprets the fundamental terms of the theory and gives them new meaning” (3). The most important motivation for QBism, enthusiastically stated on the book’s cover, is that QBism provides “a way past quantum theory’s paradoxes and puzzles” such that much (...)
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  25. added 2017-05-22
    O problema ontológico da consciência na mecânica quântica.Raoni Wohnrath Arroyo - 2015 - Dissertation, Universidade Estadual de Maringá
    Quantum mechanics is an area of Physics that deals with subatomic phenomena. It can be extracted from a vision of the physical world which contradicts many aspects of our everyday perception, prompting many philosophical debates and admitting different interpretations. Among the wide range of problems within the interpretation of quantum theory, there is the measurement problem. Some philosophical aspects of the problems concerning the notion of “measurement” in quantum mechanics are analyzed in order to identify how the problem arises in (...)
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  26. added 2017-03-06
    Book Reviews. [REVIEW]Gordon Belot - 1997 - International Studies in the Philosophy of Science 11 (3):305-313.
    A review of Rob Clifton (ed.), Perspectives on Quantum Reality: Non-Relativistic, Relativistic, and Field-Theoretic.
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  27. added 2017-02-28
    Karl Popper, Science and Enlightenment.Nicholas Maxwell - 2017 - London: UCL Press.
    Karl Popper is famous for having proposed that science advances by a process of conjecture and refutation. He is also famous for defending the open society against what he saw as its arch enemies – Plato and Marx. Popper’s contributions to thought are of profound importance, but they are not the last word on the subject. They need to be improved. My concern in this book is to spell out what is of greatest importance in Popper’s work, what its failings (...)
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  28. added 2017-02-15
    The Status of Determinism in Proofs of the Impossibility of a Noncontextual Model of Quantum Theory.Robert W. Spekkens - 2014 - Foundations of Physics 44 (11):1125-1155.
    In order to claim that one has experimentally tested whether a noncontextual ontological model could underlie certain measurement statistics in quantum theory, it is necessary to have a notion of noncontextuality that applies to unsharp measurements, i.e., those that can only be represented by positive operator-valued measures rather than projection-valued measures. This is because any realistic measurement necessarily has some nonvanishing amount of noise and therefore never achieves the ideal of sharpness. Assuming a generalized notion of noncontextuality that applies to (...)
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  29. added 2017-02-15
    Measurement in Quantum Mechanics.H. Krips - 1999 - Stanford Encyclopedia of Philosophy. Http://Plato. Stanford. Edu/Entries/Qt-Measurement/. First Published Tuesday October 12.
  30. added 2017-02-14
    Measurement in Quantum Theory: The End of Copenhagen Monocracy.H. Krips - 2007 - In Thaddeus Metz (ed.), Stanford Encyclopedia of Philosophy. pp. 6333--6334.
  31. added 2017-02-11
    Causality, Measurement, and Elementary Interactions.Edward J. Gillis - 2011 - Foundations of Physics 41 (12):1757-1785.
    Signal causality, the prohibition of superluminal information transmission, is the fundamental property shared by quantum measurement theory and relativity, and it is the key to understanding the connection between nonlocal measurement effects and elementary interactions. To prevent those effects from transmitting information between the generating and observing process, they must be induced by the kinds of entangling interactions that constitute measurements, as implied in the Projection Postulate. They must also be nondeterministic as reflected in the Born Probability Rule. The nondeterminism (...)
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  32. added 2017-02-11
    Relational Physics with Real Rods and Clocks and the Measurement Problem of Quantum Mechanics.Rodolfo Gambini & Jorge Pullin - 2007 - Foundations of Physics 37 (7):1074-1092.
    The use of real clocks and measuring rods in quantum mechanics implies a natural loss of unitarity in the description of the theory. We briefly review this point and then discuss the implications it has for the measurement problem in quantum mechanics. The intrinsic loss of coherence allows to circumvent some of the usual objections to the measurement process as due to environmental decoherence.
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  33. added 2017-02-11
    Which Natural Processes Have the Special Status of Measurements?M. E. Burgos - 1998 - Foundations of Physics 28 (8):1323-1346.
    We assume, in the first place, that two kinds of processes occur in nature: the strictly continuous and causal ones, which are governed by the Schrödinger equation and those implying discontinuities, which are ruled by probability laws. In the second place, we adopt a postulate ensuring the statistical sense of conservation laws. These hypotheses allow us to state a rule telling, in principle, in which situations and to which vectors the system's state can collapse, and which are the corresponding probabilities. (...)
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  34. added 2017-02-11
    Naturalizing the Copenhagen Interpretation.G. Szamosi - 1993 - Dialectica 47 (4):305-325.
    SummaryThe problem of quantum measurement is considered in the framework of a naturalized and evolutionary epistemology. Consider two simple textbook observations: a) quantum measurement is an information processing method invented for the purpose of exploring domains of the external world which are not accessible otherwise b) quantum measurement interprets signals from the external world with the help of a computing algorithm invented specifically for this purpose. Replace the words “quantum measurement” and “invented” in a) and b) by “vision” and “evolved (...)
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  35. added 2017-02-11
    Preparation and Measurement in Quantum Physics.James L. Park & William Band - 1992 - Foundations of Physics 22 (5):657-668.
    To honor Henry Margenau on the occasion of his 90th birthday, we attempt in this essay to integrate certain aspects of the physics, philosophy, and pedagogy of quantum mechanics in a manner very much inspired by Margenau's idealist scientific epistemology. Over half a century ago, Margenau was perhaps the first philosopher of science to recognize and elaborate upon the essential distinction between thepreparation of a quantum state and themeasurement of an observable associated with a system in that state; yet in (...)
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  36. added 2017-02-11
    Measurement and “Beables” in Quantum Mechanics.Jeffrey Bub - 1991 - Foundations of Physics 21 (1):25-42.
    It is argued that the measurement problem reduces to the problem of modeling quasi-classical systems in a modified quantum mechanics with superselection rules. A measurement theorem is proved, demonstrating, on the basis of a principle for selecting the quantities of a system that are determinate (i.e., have values) in a given state, that after a suitable interaction between a systemS and a quasi-classical systemM, essentially only the quantity measured in the interaction and the indicator quantity ofM are determinate. The theorem (...)
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  37. added 2017-02-11
    On the Interpretation of Measurement in Quantum Theory.H. D. Zeh - 1970 - Foundations of Physics 1 (1):69-76.
    It is demonstrated that neither the arguments leading to inconsistencies in the description of quantum-mechanical measurement nor those “explaining” the process of measurement by means of thermodynamical statistics are valid. Instead, it is argued that the probability interpretation is compatible with an objective interpretation of the wave function.
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  38. added 2017-02-02
    "Interaction-Free" Quantum Measurement and Imaging.John Cramer - unknown
    Alternate View Column AV-101 Keywords: quantum mechanics paradox Mach-Zender interferometer interaction free measurement test Published in the June-2000 issue of Analog Science Fiction & Fact Magazine ; This column was written and submitted 12/19/99 and is copyrighted ©1999 by John G. Cramer. All rights reserved. No part may be reproduced in any form without the explicit permission of the author.
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  39. added 2017-02-01
    Testing Quantum State Reduction Via Cosmogenic Neutrinos.Joy Christian - unknown
    It is pointed out that the Diosi-Penrose ansatz for gravity-induced quantum state reduction can be tested by observing oscillations in the flavor ratios of neutrinos originated at cosmological distances. Since such a test would be almost free of environmental decoherence, testing the ansatz by means of a next generation neutrino detector such as IceCube would be much cleaner than by experiments proposed so far involving superpositions of macroscopic systems. The proposed microscopic test would also examine the universality of superposition principle (...)
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  40. added 2017-02-01
    On the Applicability of the Quantum Measurement Formalism.Hasok Chang - 1997 - Erkenntnis 46 (2):143-163.
    Customary discussions of quantum measurements are unrealistic, in the sense that they do not reflect what happens in most actual measurements even under ideal circumstances. Even theories of measurement which discard the projection postulate tend to retain two unrealistic assumptions of the von Neumann theory: that a measurement consists of a single physical interaction, and that the topic of every measurement is information wholly contained in the quantum state of the object of measurement. I suggest that these unrealistic assumptions originate (...)
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  41. added 2017-02-01
    Quantum Measurement and the Program for the Unity of Science.David C. Scharf - 1989 - Philosophy of Science 56 (4):601-623.
    It is quite extraordinary, philosophically speaking, that according to the orthodox interpretation: (a) quantum mechanics is a complete and comprehensive theory of microphysics, and yet (b) the role of measurement, in quantum mechanics, cannot be analyzed in terms of the collective effects of the microphysical particles making up the apparatus. It follows that, if the orthodox interpretation is correct, the measurement apparatus and its quantum physical effects cannot be accounted for microreductively. This is significant because it is widely believed that (...)
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  42. added 2017-01-26
    Quantum Measurement.Es Polzik & Crj Thompson - 1995 - In John Archibald Wheeler, Daniel M. Greenberger & Anton Zeilinger (eds.), Fundamental Problems in Quantum Theory: A Conference Held in Honor of Professor John A. Wheeler. New York Academy of Sciences.
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  43. added 2017-01-26
    With Complacency or Concern: Solving the Quantum Measurement Problem.Arthur Fine - 1987 - In P. Achinstein & R. Kagon (eds.), Kelvin's Baltimore Lectures and Modern Theoretical Physics. MIT Press. pp. 491--505.
  44. added 2017-01-25
    Do Quantum States Evolve? Apropos of Marchildon's Remarks.Ulrich Mohrhoff - 2004 - Foundations of Physics 34 (1):75-97.
    Marchildon’s (favorable) assessment (quant-ph/0303170, to appear in Found. Phys.) of the Pondicherry interpretation of quantum mechanics raises several issues, which are addressed. Proceeding from the assumption that quantum mechanics is fundamentally a probability algorithm, this interpretation determines the nature of a world that is irreducibly described by this probability algorithm. Such a world features an objective fuzziness, which implies that its spatiotemporal differentiation does not “go all the way down”. This result is inconsistent with the existence of an evolving instantaneous (...)
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  45. added 2017-01-24
    Quantum Technology: Where to Look for the Quantum Measurement Problem.Nancy Cartwright - 1995 - Royal Institute of Philosophy Supplement 38:73-83.
    This paper, I am afraid, advocates the philosophy of technology without actually doing it. It can best be seen as a plea for the philosophical importance of technology; in this case, importance to one of the most widely discussed problems in philosophy of physics—the measurement problem in quantum mechanics. What I want to do here is to lay out a point of view that takes the measurement problem out of the abstract mathematical structure of theory, where we discuss questions about (...)
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  46. added 2017-01-24
    Nondemolition Principle of Quantum Measurement Theory.V. P. Belavkin - 1994 - Foundations of Physics 24 (5):685-714.
    We give an explicit axiomatic formulation of the quantum measurement theory which is free of the projection postulate. It is based on the generalized nondemolition principle applicable also to the unsharp, continuous-spectrum and continuous-in-time observations. The “collapsed state-vector” after the “objectification” is simply treated as a random vector of the a posterioristate given by the quantum filtering, i.e., the conditioning of the a prioriinduced state on the corresponding reduced algebra. The nonlinear phenomenological equation of “continuous spontaneous localization” has been derived (...)
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  47. added 2017-01-24
    The Measurement Statistics Interpretation of Quantum Mechanics: Possible Values and Possible Measurement Results of Physical Quantities. [REVIEW]Gianni Cassinelli & Pekka J. Lahti - 1989 - Foundations of Physics 19 (7):873-890.
    Starting with the Born interpretation of quantum mechanics, we show that the quantum theory of measurement, supplemented by the strong law of large numbers, leads to a measurement statistics interpretation of quantum mechanics. A probabilistic characterization of the spectrum of a physical quantity is given, and an analysis of the notions of possible values and possible measurement results is carried out.
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  48. added 2017-01-24
    On the Nonoccurrence of Two Paradoxes in the Measurement Scheme of Stochastic Quantum Mechanics.F. E. Schroeck - 1985 - Foundations of Physics 15 (3):279-302.
    The internal paradoxes in the quantum measurement scheme related to violation of conservation laws, changes in entropy, absence of a dynamic description of collapse, Wigner's friend, as well as the paradox of violation of causality in the EPR experiment are shown to be partially circumvented in the measurement scheme of stochastic quantum mechanics.
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  49. added 2017-01-24
    Quantum Measurement and Algebraic Quantum Field Theories.B. DeFacio - 1976 - Foundations of Physics 6 (2):185-192.
    It is shown that the physics and semantics of quantum measurement provide a natural interpretation of the weak neighborhoods of the states on observable algebras without invoking any idea of “a reading error” or “a measured range.” Then the state preparation process in quantum measurement theory is shown to give the normal (or locally normal) states on the observable algebra. Some remarks are made concerning the physical implications of normal states for systems with an infinite number of degrees of freedom, (...)
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  50. added 2017-01-24
    The Empirical Determination of Quantum States.William Band & James L. Park - 1970 - Foundations of Physics 1 (2):133-144.
    A common approach to quantum physics is enshrouded in a jargon which treats state vectors as attributes of physical systems and the concept of state preparation as a filtration scheme wherein a process involving measurement selects from a primordial assembly of systems those bearing some prescribed vector of interest. By contrast, the empirical experiences with which quantum theory is actually concerned relate measurement and preparation in quite an opposite manner. Reproducible preparation schemes are logically and temporally anterior to measurement acts. (...)
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