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  • 2000-2004  (1)
  • 1990-1994  (4)
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  • 1
    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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    Paper (German National Licenses)
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  • 2
    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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  • 3
    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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  • 4
    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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  • 5
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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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