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40
Why the Quantum?
, 2004
"... This paper is a commentary on the foundational significance of the CliftonBubHalvorson theorem characterizing quantum theory in terms of three informationtheoretic constraints. I argue that: (1) a quantum theory is best understood as a theory about the possibilities and impossibilities of informa ..."
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Cited by 24 (1 self)
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This paper is a commentary on the foundational significance of the CliftonBubHalvorson theorem characterizing quantum theory in terms of three informationtheoretic constraints. I argue that: (1) a quantum theory is best understood as a theory about the possibilities and impossibilities of information transfer, as opposed to a theory about the mechanics of nonclassical waves or particles, (2) given the informationtheoretic constraints, any mechanical theory of quantum phenomena that includes an account of the measuring instruments that reveal these phenomena must be empirically equivalent to a quantum theory, and (3) assuming the informationtheoretic constraints are in fact satisfied in our world, no mechanical theory of quantum phenomena that includes an account of measurement interactions can be acceptable, and the appropriate aim of physics at the fundamental level then becomes the representation and manipulation of information.
An introduction to consistent quantum theory
 Rev. Mod. Phys
"... This paper presents an elementary introduction to consistent quantum theory, as developed by Griffiths and others over the past 25 years. The theory is a version of orthodox Copenhagen quantum mechanics based on the notion that the unique and mysterious feature of quantum, as opposed to classical sy ..."
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This paper presents an elementary introduction to consistent quantum theory, as developed by Griffiths and others over the past 25 years. The theory is a version of orthodox Copenhagen quantum mechanics based on the notion that the unique and mysterious feature of quantum, as opposed to classical systems, is the simultaneous existence of multiple incompatible representations of reality, referred to as “frameworks. ” A framework is a maximal set of properties of a system for which probabilities can be consistently defined. This notion is expressed by stating that a framework provides an exhaustive set of exclusive alternatives, but no single framework suffices to fully characterize a quantum system. Any prediction of the theory must be confined to a single framework and combining elements from different frameworks leads to quantum mechanically meaningless statements. This “singleframework rule ” is the precise mathematical statement of Bohr’s complementarity. It is shown that if the microscopic description is assumed to incorporate these elements in a local setting, then distant entanglements, macroscopic measurements, wavefunction collapse, and other features of quantum behavior follow in a logical manner. The essential elements of the theory are first explained using the simplest quantum system, a single spin12 degree of freedom at one time.
Quantum Bayesianism: A study
 Studies Hist. Phil. Mod. Phys
"... The Bayesian approach to quantum mechanics of Caves, Fuchs and Schack is presented. Its conjunction of realism about physics along with antirealism about much of the structure of quantum theory is elaborated; and the position defended from common objections: that it is solipsist; that it is too inst ..."
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The Bayesian approach to quantum mechanics of Caves, Fuchs and Schack is presented. Its conjunction of realism about physics along with antirealism about much of the structure of quantum theory is elaborated; and the position defended from common objections: that it is solipsist; that it is too instrumentalist; that it cannot deal with Wigner’s friend scenarios. Three more substantive problems are raised: Can a reasonable ontology be found for the approach? Can it account for explanation in quantum theory? Are subjective probabilities on their own adequate in the quantum domain? The first question is answered in the affirmative, drawing on elements from Nancy Cartwright’s philosophy of science. The second two are not: it is argued that these present outstanding difficulties for the project. A quantum Bayesian version of Moore’s paradox is developed to illustrate difficulties with the subjectivist account of pure state
Against ”Realism
"... We examine the prevalent use of the phrase “local realism ” in the context of Bell’s Theorem and associated experiments, with a focus on the question: what exactly is the ‘realism ’ in ‘local realism ’ supposed to mean? Carefully surveying several possible meanings, we argue that all of them are fla ..."
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We examine the prevalent use of the phrase “local realism ” in the context of Bell’s Theorem and associated experiments, with a focus on the question: what exactly is the ‘realism ’ in ‘local realism ’ supposed to mean? Carefully surveying several possible meanings, we argue that all of them are flawed in one way or another as attempts to point out a second premise (in addition to locality) on which the Bell inequalities rest, and (hence) which might be rejected in the face of empirical data violating the inequalities. We thus suggest that the phrase ‘local realism’ should be banned from future discussions of these issues, and urge physicists to revisit the foundational questions behind Bell’s Theorem. KEY WORDS: quantum mechanics; local realism; Bell’s theorem; EPR; quantum nonlocality
Quantum information and computation
 arXiv:quantph/0512125. Forthcoming in Butterfield and Earman (eds.) Handbook of Philosophy of Physics
, 2005
"... This Chapter deals with theoretical developments in the subject of quantum information and quantum computation, and includes an overview of classical information and some relevant quantum mechanics. The discussion covers topics in quantum communication, quantum cryptography, and quantum computation, ..."
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Cited by 8 (2 self)
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This Chapter deals with theoretical developments in the subject of quantum information and quantum computation, and includes an overview of classical information and some relevant quantum mechanics. The discussion covers topics in quantum communication, quantum cryptography, and quantum computation, and concludes by considering whether a perspective in terms of quantum information
On some early objections to Bohm’s theory
 International Studies in the Philosophy of Science 17
, 2003
"... Abstract Recent literature on Bohm’s alternative to mainstream quantum mechanics may create the misleading impression that, except for perfunctory dismissals, the theory was ignored by the physics community in the years immediately following its proposal. As a matter of fact, Einstein, Pauli, and He ..."
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Abstract Recent literature on Bohm’s alternative to mainstream quantum mechanics may create the misleading impression that, except for perfunctory dismissals, the theory was ignored by the physics community in the years immediately following its proposal. As a matter of fact, Einstein, Pauli, and Heisenberg all published criticisms of Bohm’s theory, explaining their reasons for not accepting the theory. These criticisms will be discussed and evaluated in this article. 1.
Variance Explained: Why size does not (always) matter
 In Research in organizational behavior
, 1999
"... I examine the role of explaining variance in the construction of explanatory theory. Explaining variance can be an insufficient basis for evaluating a theory (Lieberson, 1985). Starting with this insight, I suggest that models that provide explanations of variance do not necessarily provide good exp ..."
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I examine the role of explaining variance in the construction of explanatory theory. Explaining variance can be an insufficient basis for evaluating a theory (Lieberson, 1985). Starting with this insight, I suggest that models that provide explanations of variance do not necessarily provide good explanations of causal mechanisms. I then explore the utility of process models and theories (Mohr, 1982) relative to variance theories. I clarify the role of stochastic processes in such model building and discuss the implications of such processes for evaluating explanatory `adequacy'. Under some conditions, explaining variance may be neither a necessary nor a sufficient condition for good explanatory theory. I then identify some implications of this argument for developing and analyzing explanatory theory. These arguments are applied to two examples: (1) metaanalysis and (2) the disposition versus situation debate (a variant on the nature vs. nurture argument) to illustrate the implications of ...
Einstein and the KaluzaKlein particle
, 2000
"... In his search for a unified field theory that could undercut quantum mechanics, Einstein considered five dimensional classical KaluzaKlein theory. He studied this theory most intensively during the years 19381943. One of his primary objectives was finding a nonsingular particle solution. In the f ..."
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In his search for a unified field theory that could undercut quantum mechanics, Einstein considered five dimensional classical KaluzaKlein theory. He studied this theory most intensively during the years 19381943. One of his primary objectives was finding a nonsingular particle solution. In the full theory this search got frustrated and in the x⁵independent theory Einstein, together with Pauli, argued it would be impossible to find these structures.
Bananaworld: Quantum mechanics for primates. arXiv:1211.3062v2 [quantph
, 2013
"... This is intended to be a serious paper, in spite of the title. The idea is that quantum mechanics is about probabilistic correlations, i.e., about the structure of information, since a theory of information is essentially a theory of probabilistic correlations. To make this clear, it suffices to co ..."
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This is intended to be a serious paper, in spite of the title. The idea is that quantum mechanics is about probabilistic correlations, i.e., about the structure of information, since a theory of information is essentially a theory of probabilistic correlations. To make this clear, it suffices to consider measurements of two binaryvalued observables, x with outcomes a = 0 or 1, performed by Alice in a regionA, and y with outcomes b = 0 or 1 performed by Bob in a separated region B—or, to emphasize the banality of the phenomena, two ways of peeling a banana, resulting in one of two tastes. The imagined bananas of Bananaworld are nonstandard, with operational or phenomenal probabilistic correlations for peelings and tastes that lie outside the polytope of local correlations. The ‘no go ’ theorems tell us that we can’t shoehorn these correlations into a classical correlation polytope, which has the structure of a simplex, by supposing that something has been left out of the story, without giving up fundamental principles that define what we mean by a physical system. The nonclassical features of quantum mechanics, in
Heisenberg and the Nazi Atomic Bomb Project: A Study in German Culture (University of California
, 1998
"... In affectionate memory of Brian Dalton (1924–1996), Scholar, gentleman, leader, friend And in honor of my father's 80th birthday ..."
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In affectionate memory of Brian Dalton (1924–1996), Scholar, gentleman, leader, friend And in honor of my father's 80th birthday