A model for the measuring process in quantum theory

1968 ◽  
Vol 213 (5) ◽  
pp. 451-465 ◽  
Author(s):  
F. Haake ◽  
W. Weidlich
Keyword(s):  
Quantum Theory ◽  
Measuring Process

Zum Gedankenexperiment von Einstein , Podolsky und Rosen

1977 ◽  
Vol 32 (3-4) ◽  
pp. 223-228
Author(s):  
M. Weber
Keyword(s):  
Angular Momentum ◽  
Quantum Theory ◽  
Time Reversal ◽  
Time Reversal Symmetry ◽  
Measuring Process ◽  
Epr Experiment

Abstract The EPR-gedankenexperiment in the general case of systems with angular momentum of arbitrary magnitude is analyzed within the quantum theoretical measuring process. With respect to the time reversal symmetry of the systems under consideration it will be shown that the contradictions between the EPR experiment and quantum theory do not occur.

The Measuring Process in Quantum Theory

1963 ◽  
Vol 35 (1) ◽  
pp. 145-150 ◽  
Author(s):  
J. M. Burgers
Keyword(s):  
Quantum Theory ◽  
Measuring Process

The Quantum Mechanical Measuring Process as a Scattering Phenomenon Inducing a Collective Coherent Motion

1984 ◽  
Vol 39 (12) ◽  
pp. 1147-1159
Author(s):  
Manfred Requardt
Keyword(s):  
Quantum Theory ◽  
Degrees Of Freedom ◽  
Coherent Motion ◽  
Quantum Mechanical ◽  
Many Body ◽  
Measuring Process ◽  
Measuring Device ◽  
Starting Point ◽  
Tail Events ◽  
The Many

In this paper we want to discuss the quantum mechanical measuring process within the realm of many body quantum theory. Our starting point is to consider this process as a special scattering phenomenon where within one of the partners, i.e. the many body measuring device, a collective coherent motion is induced by the interaction with the microobject. We start our investigation with the many body system having a large but finite number N of degrees of freedom which is the real situation. We then study in detail what will happen in the limit N → ∞, however emphasizing that this transition is actually only performed in the mind of the observer. This implies that certain tail events together with their phase correlations have to be truncated. We show that the dichotomy "pure state" versus "mixture" as outgoing scattering states will vanish in this limit in so far as it has no observable consequences provided one is only interested in the state of the microobject. Furthermore, we discuss the role of the observer, the notion of "event", the relation between single preparation and ensemble picture, and the so-called "reduction of the wave function" in the light of our approach, i.e. explaining the phenomena accompanying the measuring process in terms of many body quantum theory.

Can Quantum Theory be presented as a Classical Ensemble Theory?

1971 ◽  
Vol 26 (10) ◽  
pp. 1740-1753
Author(s):  
Wilhelm Ochs
Keyword(s):  
Quantum Theory ◽  
Theory Of Measurement ◽  
Measuring Process ◽  
Classical Ensemble Theory ◽  
Correct Treatment ◽  
Physical Systems ◽  
Ensemble Theory ◽  
Hidden Variable ◽  
Classical Ensemble ◽  
Hidden Variable Theories

Abstract We examine the possibility of reformulating quantum theory (QT) as a deterministic ensemble theory which (a) interprets observables as objective properties of physical systems and (b) coincides with QT in all quantitative statements. As will be demonstrated, such an Ensemble-Quantum-Theory (EQT) can only be constructed if (1) one accepts a modified observable-concept, and (2) as long as the theory of measurement is left out of account. A correct treatment of the measuring process is impossible within such an EQT. Consequently, there exist no Hidden-Variable Theories with the properties (a) and (b).

Catalogue reduction techniques

1978 ◽  
Vol 48 ◽  
pp. 389-390 ◽  
Author(s):  
Chr. de Vegt
Keyword(s):  
Adjustment Process ◽  
Proper Motions ◽  
Measuring Process ◽  
Aerial Photogrammetry ◽  
Reduction Techniques ◽  
Observational Technique ◽  
The Common ◽  
Astrometric Data

AbstractReduction techniques as applied to astrometric data material tend to split up traditionally into at least two different classes according to the observational technique used, namely transit circle observations and photographic observations. Although it is not realized fully in practice at present, the application of a blockadjustment technique for all kind of catalogue reductions is suggested. The term blockadjustment shall denote in this context the common adjustment of the principal unknowns which are the positions, proper motions and certain reduction parameters modelling the systematic properties of the observational process. Especially for old epoch catalogue data we frequently meet the situation that no independent detailed information on the telescope properties and other instrumental parameters, describing for example the measuring process, is available from special calibration observations or measurements; therefore the adjustment process should be highly self-calibrating, that means: all necessary information has to be extracted from the catalogue data themselves. Successful applications of this concept have been made already in the field of aerial photogrammetry.

Quantum theory of light in nonlinear media with dispersion and absorption

1998 ◽  
Vol 45 (2) ◽  
pp. 377-402 ◽  
Author(s):  
EDUARD SCHMIDT , JOHN JEFFERS , STEPHEN M.
Keyword(s):  
Quantum Theory ◽  
Nonlinear Media
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