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  1.  33
    Nonideal Quantum Measurements.Hans Martens & Willem M. De Muynck - 1990 - Foundations of Physics 20 (3):255-281.
    A partial ordering in the class of observables (∼ positive operator-valued measures, introduced by Davies and by Ludwig) is explored. The ordering is interpreted as a form of nonideality, and it allows one to compare ideal and nonideal versions of the same observable. Optimality is defined as maximality in the sense of the ordering. The framework gives a generalization of the usual (implicit) definition of self-adjoint operators as optimal observables (von Neumann), but it can, in contrast to this latter definition, (...)
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  2.  42
    The Inaccuracy Principle.Hans Martens & Willem M. De Muynck - 1990 - Foundations of Physics 20 (4):357-380.
    The problem of joint measurement of incompatible observables is investigated. Measurements are represented by positive operator-valued measures. A quantitative notion of inaccuracy is defined. It is shown that within this framework joint inaccurate measurements are possible for arbitrary maximal projection-valued measures on finite-dimensional spaces. The accuracy of such measurements is limited, as is shown by an inaccuracy inequality we derive. This new type of uncertainty relation can be unambiguously interpreted as referring to measurement precision rather than preparative quality. Several recent (...)
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  3.  82
    On the Relation Between the Einstein-Podolsky-Rosen Paradox and the Problem of Nonlocality in Quantum Mechanics.Willem M. De Muynck - 1986 - Foundations of Physics 16 (10):973-1002.
    The EPR problem is studied both from an instrumentalistic and from a realistic point of view. Bohr's reply to the EPR paper is analyzed and demonstrated to be not completely representative of Bohr's general views on the possibility of defining properties of a microscopic object. A more faithful Bohrian answer would not have led Einstein to the conclusion that Bohr's completeness claim of quantum mechanics implies nonlocality. The projection postulate, already denounced in 1936 by Margenau as the source of the (...)
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  4. Can We Escape From Bell's Conclusion That Quantum Mechanics Describes a Non-Local Reality?Willem M. de Muynck - 1996 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 27 (3):315-330.
  5.  73
    A Quantum Mechanical Theory of Local Observables and Local Operations.Willem M. De Muynck - 1984 - Foundations of Physics 14 (3):199-253.
  6.  11
    Towards a Neo-Copenhagen Interpretation of Quantum Mechanics.Willem M. De Muynck - 2004 - Foundations of Physics 34 (5):717-770.
    The Copenhagen interpretation is critically considered. A number of ambiguities, inconsistencies and confusions are discussed. It is argued that it is possible to purge the interpretation so as to obtain a consistent and reasonable way to interpret the mathematical formalism of quantum mechanics, which is in agreement with the way this theory is dealt with in experimental practice. In particular, the essential role attributed by the Copenhagen interpretation to measurement is acknowledged. For this reason it is proposed to refer to (...)
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  7.  12
    Preparation and Measurement: Two Independent Sources of Uncertainty in Quantum Mechanics. [REVIEW]Willem M. De Muynck - 2000 - Foundations of Physics 30 (2):205-225.
    In the Copenhagen interpretation the Heisenberg inequality ΔQΔP≥ℏ/2 is interpreted as the mathematical expression of the concept of complementarity, quantifying the mutual disturbance necessarily taking place in a simultaneous or joint measurement of incompatible observables. This interpretation was criticized a long time ago and has recently been challenged in an experimental way. These criticisms can be substantiated by using the generalized formalism of positive operator-valued measures, from which an inequality, different from the Heisenberg inequality, can be derived, precisely illustrating the (...)
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  8.  9
    Simultaneous Measurement and Joint Probability Distributions in Quantum Mechanics.Willem M. De Muynck, Peter A. E. M. Janssen & Alexander Santman - 1979 - Foundations of Physics 9 (1-2):71-122.
    The problem of simultaneous measurement of incompatible observables in quantum mechanics is studied on the one hand from the viewpoint of an axiomatic treatment of quantum mechanics and on the other hand starting from a theory of measurement. It is argued that it is precisely such a theory of measurement that should provide a meaning to the axiomatically introduced concepts, especially to the concept of observable. Defining an observable as a class of measurement procedures yielding a certain prescribed result for (...)
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  9.  4
    Can We Escape From Bell's Conclusion That Quantum Mechanics Describes a Non-Local Reality?Willem M. de Muynck - 1996 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 27 (3):315-330.
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  10. On the Relation Between Indistinguishability of Identical Particles and Symmetry of the Wave Function in Quantum Mechanics.Willem M. De Muynck & Gidi P. Van Liempd - 1986 - Synthese 67 (3):477-496.
    Two different concepts of distinguishability are often mixed up in attempts to derive in quantum mechanics the symmetry of the wave function from indistinguishability of identical particles. Some of these attempts are analyzed and shown to be defective. It is argued that, although identical particles should be considered as observationally indistinguishable in symmetric states, they may be considered to be conceptually distinguishable. These two notions of distinguishability have quite different physical origins, the former one being related to observations while the (...)
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  11. Wide Physical Realization.Willem M. de Muynck - 2003 - Inquiry : An Interdisciplinary Journal of Philosophy 46 (1):97-111.
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