Results for 'Decoherence'

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  1. Decoherence and the Classical Limit of Quantum Mechanics.Valia Allori - 2002 - Dissertation, University of Genova, Italy
    In my dissertation (Rutgers, 2007) I developed the proposal that one can establish that material quantum objects behave classically just in case there is a “local plane wave” regime, which naturally corresponds to the suppression of all quantum interference.
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  2.  42
    Illusory Decoherence.Sam Kennerly - 2012 - Foundations of Physics 42 (9):1200-1209.
    Suppose a quantum experiment includes one or more random processes. Then the results of repeated measurements may appear consistent with irreversible decoherence even if the system’s evolution prior to measurement is reversible and unitary. Two thought experiments are constructed as examples.
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  3.  55
    Decoherence and Wave Function Collapse.Roland Omnès - 2011 - Foundations of Physics 41 (12):1857-1880.
    The possibility of consistency between the basic quantum principles of quantum mechanics and wave function collapse is reexamined. A specific interpretation of environment is proposed for this aim and is applied to decoherence. When the organization of a measuring apparatus is taken into account, this approach leads also to an interpretation of wave function collapse, which would result in principle from the same interactions with environment as decoherence. This proposal is shown consistent with the non-separable character of quantum (...)
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  4.  57
    Decoherence and the Copenhagen Cut.Scott Tanona - 2013 - Synthese 190 (16):3625-3649.
    While it is widely agreed that decoherence will not solve the measurement problem, decoherence has been used to explain the “emergence of classicality” and to eliminate the need for a Copenhagen edict that some systems simply have to be treated as classical via a quantum-classical “cut”. I argue that decoherence still relies on such a cut. Decoherence accounts derive classicality only in virtue of their incompleteness, by omission of part of the entangled system of which the (...)
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  5. Less Decoherence and More Coherence in Quantum Gravity, Inflationary Cosmology and Elsewhere.Elias Okon & Daniel Sudarsky - 2016 - Foundations of Physics 46 (7):852-879.
    In Crull it is argued that, in order to confront outstanding problems in cosmology and quantum gravity, interpretational aspects of quantum theory can by bypassed because decoherence is able to resolve them. As a result, Crull concludes that our focus on conceptual and interpretational issues, while dealing with such matters in Okon and Sudarsky, is avoidable and even pernicious. Here we will defend our position by showing in detail why decoherence does not help in the resolution of foundational (...)
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  6.  93
    Decoherent Histories of Spin Networks.David P. B. Schroeren - 2013 - Foundations of Physics 43 (3):310-328.
    The decoherent histories formalism, developed by Griffiths, Gell-Mann, and Hartle (in Phys. Rev. A 76:022104, 2007; arXiv:1106.0767v3 [quant-ph], 2011; Consistent Quantum Theory, Cambridge University Press, 2003; arXiv:gr-qc/9304006v2, 1992) is a general framework in which to formulate a timeless, ‘generalised’ quantum theory and extract predictions from it. Recent advances in spin foam models allow for loop gravity to be cast in this framework. In this paper, I propose a decoherence functional for loop gravity and interpret existing results (Bianchi et al. (...)
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  7. Decoherence: The View From the History and the Philosophy of Science.Amit Hagar - 2012 - Phil. Trans. Royal Soc. London A 375 (1975).
    We present a brief history of decoherence, from its roots in the foundations of classical statistical mechanics, to the current spin bath models in condensed matter physics. We analyze the philosophical import of the subject matter in three different foundational problems, and find that, contrary to the received view, decoherence is less instrumental to their solutions than it is commonly believed. What makes decoherence more philosophically interesting, we argue, are the methodological issues it draws attention to, and (...)
     
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  8. Why Decoherence has Not Solved the Measurement Problem: A Response to P.W. Anderson.L. S. - 2003 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 34 (1):135-142.
    We discuss why, contrary to claims recently made by P.W. Anderson, decoherence has not solved the quantum measurement problem.
     
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  9.  53
    Quantum Decoherence in a Pragmatist View: Dispelling Feynman’s Mystery. [REVIEW]Richard Healey - 2012 - Foundations of Physics 42 (12):1534-1555.
    The quantum theory of decoherence plays an important role in a pragmatist interpretation of quantum theory. It governs the descriptive content of claims about values of physical magnitudes and offers advice on when to use quantum probabilities as a guide to their truth. The content of a claim is to be understood in terms of its role in inferences. This promises a better treatment of meaning than that offered by Bohr. Quantum theory models physical systems with no mention of (...)
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  10.  16
    Why Decoherence has Not Solved the Measurement Problem: A Response to P.W. Anderson.Stephen L. Adler - 2003 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 34 (1):135-142.
  11. Why Decoherence has Not Solved the Measurement Problem: A Response to P.W. Anderson.Stephen L. Adler - 2003 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 34 (1):135-142.
  12.  6
    Decoherence in an Isolated Macroscopic Quantum System: A Parameter-Free Model Involving Gravity.Jesus Unturbe - 1995 - In M. Ferrero & A. van der Merwe (eds.), Fundamental Problems in Quantum Physics. pp. 73--341.
  13.  75
    The 'Decoherence' Approach to the Measurement Problem in Quantum Mechanics.Andrew Elby - 1994 - PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association 1994:355 - 365.
    Decoherence results from the dissipative interaction between a quantum system and its environment. As the system and environment become entangled, the reduced density operator describing the system "decoheres" into a mixture (with the interference terms damped out). This formal result prompts some to exclaim that the measurement problem is solved. I will scrutinize this claim by examining how modal and relative-state interpretations can use decoherence. Although decoherence cannot rescue these interpretations from general metaphysical difficulties, decoherence may (...)
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  14.  10
    Quantum Decoherence in a Pragmatist View: Part I.Richard Healey - unknown
    The quantum theory of decoherence plays an important role in a pragmatist interpretation of quantum theory. It governs the descriptive content of claims about values of physical magnitudes and offers advice on when to use quantum probabilities as a guide to their truth. The content of a claim is to be understood in terms of its role in inferences. This promises a better treatment of meaning than that of Bohr. Quantum theory models physical systems with no mention of measurement: (...)
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  15.  39
    Decoherence and its Role in the Modern Measurement Problem.David Wallace - unknown
    Decoherence is widely felt to have something to do with the quantum measurement problem, but getting clear on just what is made diffcult by the fact that the "measurement problem", as traditionally presented in foundational and philosophical discussions, has become somewhat disconnected from the conceptual problems posed by real physics. This, in turn, is because quantum mechanics as discussed in textbooks and in foundational discussions has become somewhat removed from scientific practice, especially where the analysis of measurement is concerned. (...)
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  16. Decoherence in Continuous Measurements: From Models to Phenomenology. [REVIEW]Michael B. Mensky - 1997 - Foundations of Physics 27 (12):1637-1654.
    Decoherence is the name for the complex of phenomena leading to appearance of classical features of quantum systems. In the present paper decoherence in continuous measurements is analyzed with the help of restricted path integrals (RPI) and (equivalently in simple cases) complex Hamiltonians. A continuous measurement results in a readout giving information in the classical form on the evolution of the measured quantum system. The quantum features of the system reveal themselves in the variation of possible measurement readouts. (...)
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  17.  40
    Quantum Decoherence: A Logical Perspective.Sebastian Fortin & Leonardo Vanni - 2014 - Foundations of Physics 44 (12):1258-1268.
    The so-called classical limit of quantum mechanics is generally studied in terms of the decoherence of the state operator that characterizes a system. This is not the only possible approach to decoherence. In previous works we have presented the possibility of studying the classical limit in terms of the decoherence of relevant observables of the system. On the basis of this approach, in this paper we introduce the classical limit from a logical perspective, by studying the way (...)
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  18.  15
    Decoherence and Determinism in a One-Dimensional Cloud-Chamber Model.Jean-Marc Sparenberg & David Gaspard - 2018 - Foundations of Physics 48 (4):429-439.
    The hypothesis that the particular linear tracks appearing in the measurement of a spherically-emitting radioactive source in a cloud chamber are determined by the positions of atoms or molecules inside the chamber is further explored in the framework of a recently established one-dimensional model. In this model, meshes of localized spins 1/2 play the role of the cloud-chamber atoms and the spherical wave is replaced by a linear superposition of two wave packets moving from the origin to the left and (...)
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  19.  21
    Quantum Decoherence in a Pragmatist View: Resolving the Measurement Problem.Richard Healey - unknown
    This paper aims to show how adoption of a pragmatist interpretation permits a satisfactory resolution of the quantum measurement problem. The classic measurement problem dissolves once one recognizes that it is not the function of the quantum state to describe or represent the behavior of a quantum system. The residual problem of when, and to what, to apply the Born Rule may then be resolved by judicious appeal to decoherence. This can give sense to talk of measurements of photons (...)
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  20.  98
    Decoherence and the Quantum-to-Classical Transition (Springer, Berlin, 2007, Corrected Second Printing, 2008), Xv+416pp., ISBN 978-3-540-35773-5, Hardcover, 74.85 Euro. [REVIEW]N. P. Landsman - 2009 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 40 (1):94-95.
  21.  54
    Decoherence and CPT Violation in a Stringy Model of Space-Time Foam.Nick E. Mavromatos - 2010 - Foundations of Physics 40 (7):917-960.
    I discuss a model inspired from the string/brane framework, in which our Universe is represented (after perhaps appropriate compactification) as a three brane, propagating in a bulk space time punctured by D0-brane (D-particle) defects. As the D3-brane world moves in the bulk, the D-particles cross it, and from an effective observer on D3 the situation looks like a “space-time foam” with the defects “flashing” on and off (“D-particle foam”). The open strings, with their ends attached on the brane, which represent (...)
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  22.  82
    Subjective Decoherence in Quantum Measurements.Thomas Breuer - 1996 - Synthese 107 (1):1 - 17.
    General results about restrictions on measurements from inside are applied to quantum mechanics. They imply subjective decoherence: For an apparatus it is not possible to determine whether the joint system consisting of itself and the observed system is in a statistical state with or without interference terms; it is possible that the apparatus systematically mistakes the real pure state of the joint system for the decohered state. We discuss the relevance of subjective decoherence for quantum measurements and for (...)
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  23.  45
    Decoherence, Relative States, and Evolutionary Adaptation.Simon Saunders - 1993 - Foundations of Physics 23 (12):1553-1585.
    We review the decoherent histories approach to the interpretation of quantum mechanics. The Everett relative-state theory is reformulated in terms of decoherent histories. A model of evolutionary adaptation is shown to imply decoherence. A general interpretative framework is proposed: probability and value-definiteness are to have a similar status to the attribution of tense in classical spacetime theory.
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  24.  23
    Decoherence and Ontology, Or: How I Learned To Stop Worrying And Love FAPP.David Wallace - 2010 - In Simon Saunders, Jonathan Barrett, Adrian Kent & David Wallace (eds.), Many Worlds? Everett, Quantum Theory, and Reality. Oxford, U.K.: Oxford University Press.
    I make the case that the Universe according to unitary quantum theory has a branching structure, and so can literally be regarded as a "many-worlds" theory. These worlds are not part of the _fundamental_ ontology of quantum theory - instead, they are to be understood as structures, or patterns, emergent from the underlying theory, through the dynamical process of decoherence. That they are structures in this sense does not mean that they are in any way unreal: indeed, pretty much (...)
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  25.  52
    Decoherence and Wavefunction Collapse in Quantum Measurements.Mikio Namiki - 1999 - Foundations of Physics 29 (3):457-464.
    Examining the notion of wavefunction collapse (WFC) in quantum measurements, which came again to be in question in the recent debate on the quantum Zeno effect, we remark that WFC is realized only through decoherence among branch waves by detection, after a spectral decomposition process from an initial object wavefunction to a superposition of branch waves corresponding to relevant measurement propositions. We improve the definition of the decoherence parameter, so as to be fitted to general cases, by which (...)
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  26.  33
    Quantum Decoherence and the Approach to Equilibrium.Meir Hemmo & Orly Shenker - 2005 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 36 (4):626-648.
    We discuss a recent proposal by Albert to recover thermodynamics on a purely dynamical basis, using the quantum theory of the collapse of the wave function of Ghirardi, Rimini and Weber. We propose an alternative way to explain thermodynamics within no-collapse interpretations of quantum mechanics. Our approach relies on the standard quantum mechanical models of environmental decoherence of open systems, \eg Joos and Zeh and Zurek and Paz. This paper presents the two approaches and discusses their advantages. The problems (...)
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  27. Quantum Decoherence and the Approach to Equilibrium.Meir Hemmo & Orly Shenker - 2003 - Philosophy of Science 70 (2):330-358.
    We discuss a recent proposal by Albert (1994a; 1994b; 2000, ch. 7) to recover thermodynamics on a purely dynamical basis, using the quantum theory of the collapse of the wave function by Ghirardi, Rimini, and Weber (1986). We propose an alternative way to explain thermodynamics within no-collapse interpretations of quantum mechanics. Our approach relies on the standard quantum mechanical models of environmental decoherence of open systems (e.g., Joos and Zeh 1985; Zurek and Paz 1994). This paper presents the two (...)
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  28.  4
    Macroscopic Decoherence and Classical Stochastic Gravity.Jose L. Sanchez-Gomez - 1995 - In M. Ferrero & A. van der Merwe (eds.), Fundamental Problems in Quantum Physics. pp. 73--291.
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  29. Time, Decoherence and Quantum Mechanics.Simon Saunders - 1995 - Synthese 102 (2):235-266.
  30.  7
    Decoherence and Idealization in Quantum Measurement.Chuang Liu - 1998 - Poznan Studies in the Philosophy of the Sciences and the Humanities 63:75-98.
  31.  93
    Decoherence in Unorthodox Formulations of Quantum Mechanics.Vassilios Karakostas & Michael Dickson - 1995 - Synthese 102 (1):61 - 97.
    The conceptual structure of orthodox quantum mechanics has not provided a fully satisfactory and coherent description of natural phenomena. With particular attention to the measurement problem, we review and investigate two unorthodox formulations. First, there is the model advanced by GRWP, a stochastic modification of the standard Schrödinger dynamics admitting statevector reduction as a real physical process. Second, there is the ontological interpretation of Bohm, a causal reformulation of the usual theory admitting no collapse of the statevector. Within these two (...)
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  32. Decoherence, Einselection, Envariance, and Quantum Darwinism: From Relative States to the Existential Interpretation.Wojciech Zurek - 2010 - In Simon Saunders, Jonathan Barrett, Adrian Kent & David Wallace (eds.), Many Worlds?: Everett, Quantum Theory & Reality. Oxford University Press.
     
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  33. Decoherence, Einselection, Envariance, and Quantum Darwinism: From Relative States to the Existential Interpretation.Wojciech Zurek - 2010 - In Simon Saunders, Jonathan Barrett, Adrian Kent & David Wallace (eds.), Many Worlds?: Everett, Quantum Theory, & Reality. Oxford University Press.
     
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  34.  68
    How Decoherence Can Solve the Measurement Problem.Dieter Zeh - manuscript
  35. The Unreasonable Effectiveness of Decoherence.Davide Romano -
    This paper aims to clarify some conceptual aspects of decoherence that seem largely overlooked in the recent literature. In particular, I want to stress that decoherence theory, in the standard framework, is rather silent with respect to the description of (sub)systems and associated dynamics. Also, the selection of position basis for classical objects is more problematic than usually thought: while, on the one hand, decoherence offers a pragmatic-oriented solution to this problem, on the other hand, this can (...)
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  36.  48
    Making Sense of Approximate Decoherence.Guido Bacciagaluppi & Meir Hemmo - 1994 - PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association 1994:345 - 354.
    In realistic situations where a macroscopic system interacts with an external environment, decoherence of the quantum state, as derived in the decoherence approach, is only approximate. We argue that this can still give rise to facts, provided that during the decoherence process states that are, respectively, always close to eigenvectors of pointer position and record observable are correlated. We show in a model that this is always the case.
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  37. Less Interpretation and More Decoherence in Quantum Gravity and Inflationary Cosmology.Elise M. Crull - 2015 - Foundations of Physics 45 (9):1019-1045.
    I argue that quantum decoherence—understood as a dynamical process entailed by the standard formalism alone—carries us beyond conceptual aspects of non-relativistic quantum mechanics deemed insurmountable by many contributors to the recent quantum gravity and cosmology literature. These aspects include various incarnations of the measurement problem and of the quantum -to-classical puzzle. Not only can such problems be largely bypassed or dissolved without default to a particular interpretation, but theoretical work in relativistic arenas stands to gain substantial physical and philosophical (...)
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  38. Decoherence and Ontology (Or: How I Learned to Stop Worrying and Love FAPP).David Wallace - 2010 - In Simon Saunders, Jon Barrett, Adrian Kent & David Wallace (eds.), Many Worlds?: Everett, Quantum Theory & Reality. Oxford University Press. pp. 53--72.
    NGC 1300 (shown in figure 1) is a spiral galaxy 65 million light years from Earth.1 We have never been there, and (although I would love to be wrong about this) we will never go there; all we will ever know about NGC 1300 is what we can see of it from sixty-five million light years away, and what we can infer from our best physics. Fortunately, “what we can infer from our best physics” is actually quite a lot. To (...)
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  39.  45
    Decoherence Induced Equilibration.L. S. Schulman - 2007 - Foundations of Physics 37 (12):1716-1726.
    A pair of harmonic oscillators come in contact and then separate. This could be a model of an atom encountering an electromagnetic field. We explore the coherence properties of the resulting state as a function of the sort of initial condition used. A surprising result is that if one imagines a large collection of these objects repeatedly coming in contact and separating, the asymptotic distribution functions are not Boltzmann distributions, but rather exponentials with the same rate of dropoff.
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  40.  17
    The Measurement Problem: Decoherence and Convivial Solipsism.Hervé Zwirn - 2016 - Foundations of Physics 46 (6):635-667.
    The problem of measurement is often considered an inconsistency inside the quantum formalism. Many attempts to solve it have been made since the inception of quantum mechanics. The form of these attempts depends on the philosophical position that their authors endorse. I will review some of them and analyze their relevance. The phenomenon of decoherence is often presented as a solution lying inside the pure quantum formalism and not demanding any particular philosophical assumption. Nevertheless, a widely debated question is (...)
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  41.  46
    Enhancement of Decoherence by Chaotic-Like Behavior.J. Levitan, M. Lewkowicz & Y. Ashkenazy - 1997 - Foundations of Physics 27 (2):203-214.
    We demonstrate by use of a simple one-dimensional model of a square barrier imbedded in an infinite potential well that decoherence is enhanced by chaotic-like behavior. We, moreover, show that the transition h→0 is singular. Finally it is argued that the time scale on which decoherence occurs depends, on the degree of complexity of the underlying quantum mechanical system, i.e., more complex systems decohere relatively faster than less complex ones.
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  42.  90
    The Role of Decoherence in Quantum Mechanics.Guido Bacciagaluppi - 2003 - Stanford Encyclopedia of Philosophy.
    Interference phenomena are a well-known and crucial feature of quantum mechanics, the two-slit experiment providing a standard example. There are situations, however, in which interference effects are (artificially or spontaneously) suppressed. We shall need to make precise what this means, but the theory of decoherence is the study of (spontaneous) interactions between a system and its environment that lead to such suppression of interference. This study includes detailed modelling of system-environment interactions, derivation of equations (‘master equations’) for the (reduced) (...)
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  43. Many Worlds: Decoherent or Incoherent?Karim P. Y. Thébault & Richard Dawid - 2015 - Synthese 192 (5):1559-1580.
    We claim that, as it stands, the Deutsch–Wallace–Everett approach to quantum theory is conceptually incoherent. This charge is based upon the approach’s reliance upon decoherence arguments that conflict with its own fundamental precepts regarding probabilistic reasoning in two respects. This conceptual conflict obtains even if the decoherence arguments deployed are aimed merely towards the establishment of certain ‘emergent’ or ‘robust’ structures within the wave function: To be relevant to physical science notions such as robustness must be empirically grounded, (...)
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  44. The Metaphysics of Decoherence.Antonio Vassallo & Davide Romano - 2021 - Erkenntnis:1-23.
    The paper investigates the type of realism that best suits the framework of decoherence taken at face value without postulating a plurality of worlds, or additional hidden variables, or non-unitary dynamical mechanisms. It is argued that this reading of decoherence leads to an extremely radical type of perspectival realism, especially when cosmological decoherence is considered.
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  45.  16
    Bootstrapping Time Dilation Decoherence.Cisco Gooding & William G. Unruh - 2015 - Foundations of Physics 45 (10):1166-1178.
    We present a general relativistic model of a spherical shell of matter with a perfect fluid on its surface coupled to an internal oscillator, which generalizes a model recently introduced by the authors to construct a self-gravitating interferometer. The internal oscillator evolution is defined with respect to the local proper time of the shell, allowing the oscillator to serve as a local clock that ticks differently depending on the shell’s position and momentum. A Hamiltonian reduction is performed on the system, (...)
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  46. Can the Decoherence Approach Help to Solve the Measurement Problem?Osvaldo Pessoa - 1997 - Synthese 113 (3):323-346.
    This work examines whether the environmentally-induced decoherence approach in quantum mechanics brings us any closer to solving the measurement problem, and whether it contributes to the elimination of subjectivism in quantum theory. A distinction is made between ,collapse, and ,decoherence,, so that an explanation for decoherence does not imply an explanation for collapse. After an overview of the measurement problem and of the open-systems paradigm, we argue that taking a partial trace is equivalent to applying the projection (...)
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  47.  17
    Self-Induced Decoherence: A New Approach.Mario Castagnino & Olimpia Lombardi - 2003 - Studies in History and Philosophy of Modern Physics 35 (1):73-107.
    According to Zurek, decoherence is a process resulting from the interaction between a quantum system and its environment; this process singles out a preferred set of states, usually called “pointer basis”, that determines which observables will receive definite values. This means that decoherence leads to a sort of selection which precludes all except a small subset of the states in the Hilbert space of the system from behaving in a classical manner: environment-induced-superselection—einselection —is a consequence of the process (...)
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  48.  30
    Self-Induced Decoherence: A New Approach.Mario Castagnino & Olimpia Lombardi - 2004 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 35 (1):73-107.
    According to Zurek, decoherence is a process resulting from the interaction between a quantum system and its environment; this process singles out a preferred set of states, usually called “pointer basis”, that determines which observables will receive definite values. This means that decoherence leads to a sort of selection which precludes all except a small subset of the states in the Hilbert space of the system from behaving in a classical manner: environment-induced-superselection—einselection —is a consequence of the process (...)
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  49.  87
    Isomerism and Decoherence.Sebastian Fortin, Olimpia Lombardi & Juan Camilo Martínez González - 2016 - Foundations of Chemistry 18 (3):225-240.
    In the present paper we address the problem of optical isomerism embodied in the socalled “Hund’s paradox”, which points to the difficulty to account for chirality by means of quantum mechanics. In particular, we explain the answer to the problem proposed by the theory of decoherence. The purpose of this article is to challenge this answer on the basis of a conceptual analysis of the phenomenon of decoherence, that reveals the limitations of the theory of decoherence to (...)
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  50.  31
    Partial Traces in Decoherence and in Interpretation: What Do Reduced States Refer To?Sebastian Fortin & Olimpia Lombardi - 2014 - Foundations of Physics 44 (4):426-446.
    The interpretation of the concept of reduced state is a subtle issue that has relevant consequences when the task is the interpretation of quantum mechanics itself. The aim of this paper is to argue that reduced states are not the quantum states of subsystems in the same sense as quantum states are states of the whole composite system. After clearly stating the problem, our argument is developed in three stages. First, we consider the phenomenon of environment-induced decoherence as an (...)
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