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  1. Classical Systems, Standard Quantum Systems, and Mixed Quantum Systems in Hilbert Space.K. Kong Wan, Jason Bradshaw, Colin Trueman & F. E. Harrison - 1998 - Foundations of Physics 28 (12):1739-1783.
    Traditionally, there has been a clear distinction between classical systems and quantum systems, particularly in the mathematical theories used to describe them. In our recent work on macroscopic quantum systems, this distinction has become blurred, making a unified mathematical formulation desirable, so as to show up both the similarities and the fundamental differences between quantum and classical systems. This paper serves this purpose, with explicit formulations and a number of examples in the form of superconducting circuit systems. We introduce three (...)
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  2.  86
    Quantization by Parts, Self-Adjoint Extensions, and a Novel Derivation of the Josephson Equation in Superconductivity.K. Kong Wan & R. H. Fountain - 1996 - Foundations of Physics 26 (9):1165-1199.
    There has been a lot of interest in generalizing orthodox quantum mechanics to include POV measures as observables, namely as unsharp obserrables. Such POV measures are related to symmetric operators. We have argued recently that only maximal symmetric operators should describe observables.1 This generalization to maximal symmetric operators has many physical applications. One application is in the area of quantization. We shall discuss a scheme, to he called quantization by parts,which can systematically deal with what may be called quantum circuits. (...)
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  3.  61
    Local Observables, Nonlocality, and Asymptotically Separable Quantum Mechanics.K. Kong Wan - 1988 - Foundations of Physics 18 (9):887-911.
    Quantum mechanics is troubled by the problem of nonlocality inherent in the theory. In a series of papers we explore the possibility of an algebraic formulation of quantum mechanics based on local observables which would incorporate nonlocality when small distances are involved but would be separable at large distances. This paper reviews some of the basic ideas and theories developed recently. These include a unified localization scheme, the introduction of local comoving evolution, local comoving observables, and related conservation laws. Technical (...)
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  4.  10
    Unitary State Preparation, Local Position Measurements, and Spin in Quantum Mechanics.K. Kong Wan & R. G. McLean - 1994 - Foundations of Physics 24 (5):715-737.
    The orthodox presentation of quantum theory often includes statements on state preparation and measurements without mentioning how these processes can be achieved. The often quoted projection postulate is regarded by many as problematical. This paper presents a systematic framework for state preparation and measurement. Within the existing Hilbert space formulation of quantum mechanics for spinless particles we show that it is possible (1)to prepare an arbitrary state and (2)to reduce all quantum measurements to local position measurements in an asymptotic way (...)
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  5.  46
    The Quantum Theory of Measurement. [REVIEW]K. Kong Wan - 1997 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 28 (4):537-539.
  6.  25
    Local Spatial Transformations and Local Observables.K. Kong Wan - 1991 - Foundations of Physics 21 (9):1107-1116.
    Traditionally spatial transformations such as translations and rotations are formulated in terms of transformations of the entire spatial space. In other words, transformations are taken automatically to be of a global nature. This paper investigates a local approach to spatial transformations; local transformations lead naturally to local observables in quantum mechanics.
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    The Quantum Theory of Measurement.K. Kong Wan - 1997 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 28 (4):537-539.