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James L. Park [25]James Park [4]James D. Park [1]
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James Y. Park
City University of New York
  1. Quantum Theoretical Concepts of Measurement: Part I.James L. Park - 1968 - Philosophy of Science 35 (3):205-231.
    The overall purpose of this paper is to clarify the physical meaning and epistemological status of the term 'measurement' as used in quantum theory. After a review of the essential logical structure of quantum physics, Part I presents interpretive discussions contrasting the quantal concepts observable and ensemble with their classical ancestors along the lines of Margenau's latency theory. Against this background various popular ideas concerning the nature of quantum measurement are critically surveyed. The analysis reveals that, in addition to internal (...)
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  2.  41
    The Physics and the Semantics of Quantum Measurement.Henry Margenau & James L. Park - 1973 - Foundations of Physics 3 (1):19-28.
    In a recent paper, Prugovečki offered a theory of simultaneous measurements based upon an axiomatic description of the measurement act which excludes certain illustrations of simultaneous measurement previously discussed by the present writers. In this article, the fundamental conceptions of state preparation, state determination, and measurement which underlie our research are compared to Prugovečki's interpretations of the analogous constructs in his theory of measurement.
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  3.  50
    The Concept of Transition in Quantum Mechanics.James L. Park - 1970 - Foundations of Physics 1 (1):23-33.
    The concept of quantum transition is critically examined from the perspective of the modern quantum theory of measurement. Historically rooted in the famous quantum jump of the Old Quantum Theory, the transition idea survives today in experimental jargon due to (1) the notion of uncontrollable disturbance of a system by measurement operations and (2) the wave-packet reduction hypothesis in several forms. Explicit counterexamples to both (1) and (2) are presented in terms of quantum measurement theory. It is concluded that the (...)
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  4.  47
    Mutually Exclusive and Exhaustive Quantum States.James L. Park & William Band - 1976 - Foundations of Physics 6 (2):157-172.
    The identification of a set of mutually exclusive and exhaustive propositions concerning the states of quantum systems is a corner stone of the information-theoretic foundations of quantum statistics; but the set which is conventionally adopted is in fact incomplete, and is customarily deduced from numerous misconceptions of basic quantum mechanical principles. This paper exposes and corrects these common misstatements. It then identifies a new set of quantum state propositions which is truly exhaustive and mutually exclusive, and which is compatible with (...)
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  5.  23
    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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  6.  48
    On Completely Positive Maps in Generalized Quantum Dynamics.Ralph F. Simmons & James L. Park - 1981 - Foundations of Physics 11 (1-2):47-55.
    Several authors have hypothesized that completely positive maps should provide the means for generalizing quantum dynamics. In a critical analysis of that proposal, we show that such maps are incompatible with the standard phenomenological theory of spin relaxation and that the theoretical argument which has been offered as justification for the hypothesis is fallacious.
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  7.  66
    Quantum Theoretical Concepts of Measurement: Part II.James L. Park - 1968 - Philosophy of Science 35 (4):389-411.
    This portion of the essay concludes a two-part paper, Part I of which appeared in an earlier issue of this Journal. Part II begins with a careful study of the quantum description of real experiments in order to motivate a proposal that two distinct quantum theoretical measurement constructs should be recognized, both of which must be distinguished from the concept of preparation. The different epistemological roles of these concepts are compared and explained. It is then concluded that the only possible (...)
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  8.  40
    Generalized Two-Level Quantum Dynamics. I. Representations of the Kossakowski Conditions.James L. Park & William Band - 1977 - Foundations of Physics 7 (11-12):813-825.
    This communication is part I of a series of papers which explore the theoretical possibility of generalizing quantum dynamics in such a way that the predicted motions of an isolated system would include the irreversible (entropy-increasing) state evolutions that seem essential if the second law of thermodynamics is ever to become a theorem of mechanics. In this first paper, the general mathematical framework for describing linear but not necessarily Hamiltonian mappings of the statistical operator is reviewed, with particular attention to (...)
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  9.  30
    New Information-Theoretic Foundations for Quantum Statistics.William Band & James L. Park - 1976 - Foundations of Physics 6 (3):249-262.
    When the state of a physical system is not fully determined by available data, it should be possible nevertheless to make a systematic guess concerning the unknown state by applying the principles of information theory. The resulting theoretical blend of informational and mechanical constructs should then constitute a modern structure for statistical physics. Such a program has been attempted by a number of authors, most notably Jaynes, with seeming success. However, we demonstrated in a recent publication that the standard list (...)
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  10.  54
    A General Theory of Empirical State Determination in Quantum Physics: Part I. [REVIEW]James L. Park & William Band - 1971 - Foundations of Physics 1 (3):211-226.
    This paper develops a method for extracting from data the quantum theoretical state representation belonging to any reproducible empirical scheme for preparing a physical system, provided only that at least one observable has its possible values limited to a finite set. In Part I, we formulate a general systematic procedure, based on the concept of irreducible tensor operators, for the selection of sets of observables sufficiently large to permit the unambiguous determination of an unknown quantum state.
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  11.  31
    Generalized Two-Level Quantum Dynamics. II. Non-Hamiltonian State Evolution.William Band & James L. Park - 1978 - Foundations of Physics 8 (1-2):45-58.
    A theorem is derived that enables a systematic enumeration of all the linear superoperators ℒ (associated with a two-level quantum system) that generate, via the law of motion ℒρ= $\dot \rho$ , mappings ρ(0) → ρ(t) restricted to the domain of statistical operators. Such dynamical evolutions include the usual Hamiltonian motion as a special case, but they also encompass more general motions, which are noncyclic and feature a destination state ρ(t → ∞) that is in some cases independent of ρ(0).
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  12. Rigorous Information-Theoretic Derivation of Quantum-Statistical Thermodynamics. I.James L. Park & William Band - 1977 - Foundations of Physics 7 (3-4):233-244.
    In previous publications we have criticized the usual application of information theory to quantal situations and proposed a new version of information-theoretic quantum statistics. This paper is the first in a two-part series in which our new approach is applied to the fundamental problem of thermodynamic equilibrium. Part I deals in particular with informational definitions of equilibrium and the identification of thermodynamic analogs in our modified quantum statistics formalism.
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  13.  61
    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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  14.  38
    Generalized Two-Level Quantum Dynamics. III. Irreversible Conservative Motion.James L. Park & William Band - 1978 - Foundations of Physics 8 (3-4):239-254.
    If the ordinary quantal Liouville equation ℒρ= $\dot \rho $ is generalized by discarding the customary stricture that ℒ be of the standard Hamiltonian commutator form, the new quantum dynamics that emerges has sufficient theoretical fertility to permit description even of a thermodynamically irreversible process in an isolated system, i.e., a motion ρ(t) in which entropy increases but energy is conserved. For a two-level quantum system, the complete family of time-independent linear superoperators ℒ that generate such motions is derived; and (...)
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  15.  30
    Some Fundamental Difficulties with Quantum Mechanical Collision Theory.William Band & James L. Park - 1978 - Foundations of Physics 8 (9-10):677-694.
    When quantum scattering theory is applied strictly from the point of view that the state of a system is completely described by the density matrix, whether pure or mixed, it is not possible to assume that colliding particles are at all times individually in pure states. Exact results are significantly different from conventionally accepted approximations. In particular, it turns out that the cross section as ordinarily defined in theS-matrix formalism is an adequate parameter for deciding the outcome of interactions only (...)
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  16.  21
    A General Method of Empirical State Determination in Quantum Physics: Part II. [REVIEW]William Band & James L. Park - 1971 - Foundations of Physics 1 (4):339-357.
    Here, we offer concrete illustrations of the state determination method developed abstractly in Part I of this work. Quorums are found for finite-dimensional magnetic multipole problems as well as for the harmonic oscillator with an energy cutoff. There is, in addition, a discussion of general procedures for empirically distinguishing pure states from mixed states.
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  17.  43
    Another Look at Complete Positivity in Generalized Quantum Dynamics: Reply to Raggio and Primas. [REVIEW]Ralph F. Simmons & James L. Park - 1982 - Foundations of Physics 12 (4):437-439.
    In this rejoinder to a critique by Raggio and Primas of our paper, “On Completely Positive Maps in Generalized Quantum Dynamics,” we acknowledge that, contrary to our original assertion, the Bloch equations are indeed completely positive. We then explain briefly why this modification of our analysis does not alter its main conclusions.
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  18.  35
    Complementarity Without Paradox. A Physicist's Reply to Professor Austin.James L. Park - 1967 - Zygon 2 (4):382-388.
  19.  9
    Superselection Rules in Quantum Theory: Part I. A New Proposal for State Restriction Violation. [REVIEW]Todd Gilmore & James Park - 1979 - Foundations of Physics 9 (7-8):537-556.
    It is argued that preparation of a quantum state characterized by density operator ρ not commuting with a superselection operatorQ does not by itself constitute an instance of superselection rule violation. It would, however, be an instance of state restriction violation. It is held that superselection rule violation is only possible with simultaneous observable and state restriction violations. It is shown that it is a priori conceivable to subdivide an ensemble whose ρ satisfies[ρ, Q] = 0 into subensembles whose density (...)
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  20.  30
    Comments on “The Density Matrix of Scattered Particles”.William Band & James L. Park - 1979 - Foundations of Physics 9 (11-12):937-938.
    This note, in rejoinder to a paper by Newton critical of our analysis of certain limitations of quantum scattering theory, seeks to acknowledge and to clarify the disparate interests of the two conflicting articles.
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  21.  99
    Rigorous Information-Theoretic Derivation of Quantum-Statistical Thermodynamics. II.William Band & James L. Park - 1977 - Foundations of Physics 7 (9-10):705-721.
    Part I of the present work outlined the rigorous application of information theory to a quantum mechanical system in a thermodynamic equilibrium state. The general formula developed there for the best-guess density operator $\hat \rho$ was indeterminate because it involved in an essential way an unspecified prior probability distribution over the continuumD H of strong equilibrium density operators. In Part II mathematical evaluation of $\hat \rho$ is completed after an epistemological analysis which leads first to the discretization ofD H and (...)
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  22.  30
    Henry Margenau: Physicist-Philosopher. [REVIEW]Leon Cohen & James L. Park - 1992 - Foundations of Physics 22 (5):653-656.
  23.  12
    Superselection Rules in Quantum Theory: Part II. Subensemble Selection. [REVIEW]Todd Gilmore & James L. Park - 1979 - Foundations of Physics 9 (9-10):739-749.
    A dynamical analysis of standard procedures for subensemble selection is used to show that the state restriction violation proposal in Part I of the paper cannot be realized by employing familiar correlation schemes. However, it is shown that measurement of an observable not commuting with the superselection operator is possible, a violation of the observable restrictions. This is interpreted as supporting the position that each of these restrictions is sufficient but not necessary for the superselection rule. The results do constitute (...)
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  24. A Differential Semantics for Jointree Algorithms.James D. Park & Adnan Darwiche - 2004 - Artificial Intelligence 156 (2):197-216.
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  25. Authentic Love: An Existential Vision.James Park - 1976 - Existential Books.
  26. Becoming More Authentic: The Positive Side of Existentialism.James Park - 1983 - Existential Books.
     
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  27.  8
    Discursos Y poética mapuche-huilliche actual: Cambio generacional Y diferencia territorial.James Park - 2007 - Alpha (Osorno) 24.
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  28.  39
    Quantum Assembly Semantics: The Fallacious Lingo of Occupation Numbers. [REVIEW]James L. Park - 1991 - Foundations of Physics 21 (1):83-92.
    The usual heuristic description of quantum mechanical assemblies features so-called “occupation numbers” interpreted quite literally. This essay critically compares that point of view with a more rigorous understanding of composite systems based upon a principal lesson of Einstein's paradox and Bell's inequality, viz., that it is fallacious to regard a subsystem as possessing or “occupying” any state whatever.
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  29. Thermodynamic Aspects of Schrödinger's Probability Relations.James L. Park - 1988 - Foundations of Physics 18 (2):225-244.
    Using Schrödinger's generalized probability relations of quantum mechanics, it is possible to generate a canonical ensemble, the ensemble normally associated with thermodynamic equilibrium, by at least two methods, statistical mixing and subensemble selection, that do not involve thermodynamic equilibration. Thus the question arises as to whether an observer making measurements upon systems from a canonical ensemble can determine whether the systems were prepared by mixing, equilibration, or selection. Investigation of this issue exposes antinomies in quantum statistical thermodynamics. It is conjectured (...)
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  30.  98
    The Essential Nonlinearity ofN-Level Quantum Thermodynamics.Ralph F. Simmons & James L. Park - 1981 - Foundations of Physics 11 (3-4):297-305.
    This paper explores the possibility that linear dynamical maps might be used to describe the energy-conserving, entropy-increasing motions which occur in closed thermodynamic systems as they approach canonical thermal equilibrium. ForN-level quantum systems withN>2, we prove that no such maps exist which are independent of the initial state.
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