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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
Zeno machines and hypercomputation
 Theoretical Computer Science
"... This paper reviews the ChurchTuring Thesis (or rather, theses) with reference to their origin and application and considers some models of “hypercomputation”, concentrating on perhaps the most straightforward option: Zeno machines (Turing machines with accelerating clock). The halting problem is br ..."
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This paper reviews the ChurchTuring Thesis (or rather, theses) with reference to their origin and application and considers some models of “hypercomputation”, concentrating on perhaps the most straightforward option: Zeno machines (Turing machines with accelerating clock). The halting problem is briefly discussed in a general context and the suggestion that it is an inevitable companion of any reasonable computational model is emphasised. It is suggested that claims to have “broken the Turing barrier ” could be toned down and that the important and wellfounded rôle of Turing computability in the mathematical sciences stands unchallenged.
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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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
Explaining the Unobserved—Why Quantum Mechanics Ain’t Only About
 Information,” Found. Phys
, 2006
"... A remarkable theorem by Clifton, Bub and Halvorson (2003) (CBH) characterizes quantum theory in terms of information–theoretic principles. According to Bub (2004, 2005) the philosophical significance of the theorem is that quantum theory should be regarded as a “principle” theory about (quantum) inf ..."
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A remarkable theorem by Clifton, Bub and Halvorson (2003) (CBH) characterizes quantum theory in terms of information–theoretic principles. According to Bub (2004, 2005) the philosophical significance of the theorem is that quantum theory should be regarded as a “principle” theory about (quantum) information rather than a “constructive” theory about the dynamics of quantum systems. Here we criticize Bub’s principle approach arguing that if the mathematical formalism of quantum mechanics remains intact then there is no escape route from solving the measurement problem by constructive theories. We further propose a (Wigner–type) thought experiment that we argue demonstrates that quantum mechanics on the information–theoretic approach is incomplete.
The Grammar of Teleportation
"... Whilst a straightforward consequence of the formalism of nonrelativistic quantum mechanics, the phenomenon of quantum teleportation has given rise to considerable puzzlement. In this paper, the teleportation protocol is reviewed and these puzzles dispelled. It is suggested that they arise from two ..."
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Whilst a straightforward consequence of the formalism of nonrelativistic quantum mechanics, the phenomenon of quantum teleportation has given rise to considerable puzzlement. In this paper, the teleportation protocol is reviewed and these puzzles dispelled. It is suggested that they arise from two primary sources: (1) the familiar error of hypostatizing an abstract noun (in this case, ‘information’) and (2) failure to differentiate interpretation dependent from interpretation independent features of quantum mechanics. A subsidiary source of error, the simulation fallacy, is also identified. The resolution presented of the puzzles of teleportation illustrates the benefits of paying due attention to the logical status of ‘information ’ as an abstract noun.
Quantum information does exist
"... quantum information, Schumacher, classical information, Shannon This paper advocates a concept of quantum information whose origins can be traced to Schumacher (1995). The concept of quantum information advocated is elaborated using an analogy to Shannon’s theory provided by Schumacher coding. In ..."
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quantum information, Schumacher, classical information, Shannon This paper advocates a concept of quantum information whose origins can be traced to Schumacher (1995). The concept of quantum information advocated is elaborated using an analogy to Shannon’s theory provided by Schumacher coding. In particular, this paper extends Timpson’s (2004) framework for interpreting Shannon information theory to the quantum context. Entanglement fidelity is advocated as the appropriate success criterion for the reproduction of quantum information. The relationship between the Shannon theory and quantum information theory is discussed. 1
Information, immaterialism, instrumentalism: Old and new in quantum information
 Philosophy of Quantum Information and Entanglement
, 2008
"... We live, we are told, in an information age. We are told this, perhaps, less often than once we were; but no doubt only because the phrase has become worn from use. If ours is an age of information, then quantum information theory is a field propitiously in tune with the spirit of the times: a rich ..."
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We live, we are told, in an information age. We are told this, perhaps, less often than once we were; but no doubt only because the phrase has become worn from use. If ours is an age of information, then quantum information theory is a field propitiously in tune with the spirit of the times: a rich and sophisticated physical theory that seeks to tame quantum mysteries (no less!) and turn them to ingenious computational and communication ends. It is a theory that hints, moreover, at the possibility of finally rendering the quantum unmysterious; or at least, this is a conclusion that many have been tempted to draw. And yet, for all its timeliness, some of the most intriguing of the prospects that quantum information science presents are to be found intertwining with some surprisingly old and familiar philosophical themes. These themes are immaterialism and instrumentalism; and in this essay we shall be exploring how these old ideas feature in the context of two of the most tantalizing new questions that have arisen with the advent of this field: Does quantum information theory finally help us to resolve the conceptual conundrums of quantum mechanics? And does the theory indicate a new way of thinking about the world—one in which the material as the fundamental subject matter of physical theory is seen to be replaced by the immaterial: information? The moral I will suggest is that it is only once the influence of these old ideas is explicitly recognised for what it is and treated accordingly that one can begin to hope ∗I would like to thank the organisers for the invitation to speak at the Boston Colloquium and to contribute to this resulting volume. This paper draws on material discussed in Timpson (2004, 2008b).
The Case for Quantum State Realism
, 2012
"... This Dissertation/Thesis is brought to you for free and open access by Scholarship@Western. It has been accepted for inclusion in Electronic Thesis and Dissertation Repository by an authorized administrator of ..."
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This Dissertation/Thesis is brought to you for free and open access by Scholarship@Western. It has been accepted for inclusion in Electronic Thesis and Dissertation Repository by an authorized administrator of
Reconceiving quantum theories in terms of informationtheoretic constraints
, 2005
"... This paper examines Bub’s interpretation of the foundational significance of the theorem of Clifton, Bub, and Halvorson (CBH) which characterizes quantum theories in terms of informationtheoretic constraints. Bub argues that quantum theory must be reconcieved of as a principle theory of informat ..."
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This paper examines Bub’s interpretation of the foundational significance of the theorem of Clifton, Bub, and Halvorson (CBH) which characterizes quantum theories in terms of informationtheoretic constraints. Bub argues that quantum theory must be reconcieved of as a principle theory of information where information is a new physical primitive, to the exclusion of hidden variable theories. I will argue, contrary to Bub, that the CBH theorem cannot be used to exlcude hidden variables theories. Drawing inspiration from Bub, I sketch an alternative conception of quantum mechanics as a principle theory of information, but one which embraces all empirically equivalent quantum theories. 1 1