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  • 1
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    On the Relation Between Indistinguishability of Identical Particles and (Anti)Symmetry of the Wave Function in Quantum Mechanics (1986)
    Dordrecht : Periodicals Archive Online (PAO)
    Synthese. 67:3 (1986:juni) 477 
    Details
    ISSN: 0039-7857
    Topics: Natural Sciences in General , Philosophy
    Notes: ISSUES IN THE PHILOSOPHY OF SCIENCE
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:7609-1986-067-03-000004
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  • 2
    Electronic Resource
    Electronic Resource
    On the relation between indistinguishability of identical particles and (anti)symmetry of the wave function in quantum mechanics (1986)
    Springer
    Synthese 〈Dordrecht〉 67 (1986), S. 477-496 
    Details
    ISSN: 1573-0964
    Source: Springer Online Journal Archives 1860-2000
    Topics: Natural Sciences in General , Philosophy
    Notes: Abstract Two different concepts of distinguishability are often mixed up in attempts to derive in quantum mechanics the (anti)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 (anti)symmetric states, they may be considered to be conceptually distinguishable. These two notions of (in)distinguishability have quite different physical origins, the former one being related to observations while the latter has to do with the preparation of the system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00485944
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  • 3
    Electronic Resource
    Electronic Resource
    A quantum mechanical theory of local observables and local operations (1984)
    Springer
    Foundations of physics 14 (1984), S. 199-253 
    Details
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Local operators are characterized mathematically by means of projection operators on the Banach space of bounded operators. The idea of microlocality, as opposed to macrolocality, is implemented into the theory so as to enable us to define operations that are strictly local. Necessary and sufficient conditions are investigated in order that the interaction of a local measurement instrument with a local quantum field is such a strictly local (or microlocal) operation. Application of the theory to quantum electrodynamics reveals that this theory violates microlocality as defined here. Implications which our theory may have on the issue of quantum nonlocality as studied in relation to the Bell inequalities are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730210
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  • 4
    Electronic Resource
    Electronic Resource
    Simultaneous measurement and joint probability distributions in quantum mechanics (1979)
    Springer
    Foundations of physics 9 (1979), S. 71-122 
    Details
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 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 the probability distribution of the set of values of some quantity (to be described by the set of eigenvalues of some Hermitian operator), this notion is extended to joint probability distributions of incompatible observables. It is shown that such an extension is possible on the basis of a theory of measurement, under the proviso that in simultaneously measuring such observables there is a disturbance of the measurement results of the one observable, caused by the presence of the measuring instrument of the other observable. This has as a consequence that the joint probability distribution cannot obey the marginal distribution laws usually imposed. This result is of great importance in exposing quantum mechanics as an axiomatized theory, since overlooking it seems to prohibit an axiomatic description of simultaneous measurement of incompatible observables by quantum mechanics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00715052
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  • 5
    Electronic Resource
    Electronic Resource
    The inaccuracy principle (1990)
    Springer
    Foundations of physics 20 (1990), S. 357-380 
    Details
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 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 experiments are seen to be realizations of such joint measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00731707
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation and Measurement: Two Independent Sources of Uncertainty in Quantum Mechanics (2000)
    Springer
    Foundations of physics 30 (2000), S. 205-225 
    Details
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 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 Copenhagen concept of complementarity. The different roles of preparation and measurement in creating uncertainty in quantum mechanics are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003640932686
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  • 7
    Electronic Resource
    Electronic Resource
    Nonideal quantum measurements (1990)
    Springer
    Foundations of physics 20 (1990), S. 255-281 
    Details
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 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, be justified operationally. The nonideality notion is compared to other quantum estimation theoretic methods. Measures for the amount of nonideality are derived from information theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00731693
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  • 8
    Electronic Resource
    Electronic Resource
    On the relation between the Einstein-Podolsky-Rosen paradox and the problem of nonlocality in quantum mechanics (1986)
    Springer
    Foundations of physics 16 (1986), S. 973-1002 
    Details
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 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 EPR paradox, is found to be also at the origin of the nonlocality conundrum. Its unobservability in EPR-like experiments is demonstrated, thus showing the redundancy of the idea of nonlocality in the instrumentalist interpretation of quantum mechanics. It is argued that also from a realist point of view there is no reason to assume nonlocality. The relevance of Bohm's quantum potential and of Bell's inequalities with respect to the (non)locality problem is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01892937
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  • 9
    Electronic Resource
    Electronic Resource
    On the possibility of measuring the electron spin in an inhomogeneous magnetic field (1994)
    Springer
    Foundations of physics 7 (1994), S. 343-352 
    Details
    ISSN: 1572-9524
    Keywords: Bohr ; electron spin measurement ; Stern-Gerlach device
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is widely held that Bohr has shown that the spin of a free electron is not measurable. We point out that Bohr's argument has some important ifs and buts. A concrete configuration is calculated to produce a clear spin separation. This is then shown not to contradict Bohr's reasoning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02186684
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  • 10
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    Neutron interferometry and the joint measurement of incompatible observables (1990)
    American Physical Society
    Details
    Publication Date: 1990-11-01
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Physical Society
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