Exactly calculable model for a detector with macroscopic energy emissions and wave-function collapse in quantum measurements

1994 ◽  
Vol 185 (4) ◽  
pp. 349-354 ◽  
Author(s):  
Tsunehiro Kobayashi
Keyword(s):  
Wave Function ◽  
Quantum Measurements ◽  
Wave Function Collapse ◽  
Energy Emissions

scholarly journals Quantum Measurements with, and Yet without an Observer

Entropy ◽  
2020 ◽  
Vol 22 (10) ◽  
pp. 1185
Author(s):  
Dmitri Sokolovski
Keyword(s):  
Wave Function ◽  
Quantum Theory ◽  
Quantum Measurements ◽  
Material Objects ◽  
Wave Function Collapse

It is argued that Feynman’s rules for evaluating probabilities, combined with von Neumann’s principle of psycho-physical parallelism, help avoid inconsistencies, often associated with quantum theory. The former allows one to assign probabilities to entire sequences of hypothetical Observers’ experiences, without mentioning the problem of wave function collapse. The latter limits the Observer’s (e.g., Wigner’s friend’s) participation in a measurement to the changes produced in material objects, thus leaving his/her consciousness outside the picture.

scholarly journals Detecting wave function collapse without prior knowledge

2015 ◽  
Vol 56 (8) ◽  
pp. 082103
Author(s):  
Charles Wesley Cowan ◽  
Roderich Tumulka
Keyword(s):  
Wave Function ◽  
Prior Knowledge ◽  
Wave Function Collapse

scholarly journals Decoherence and its role in the modern measurement problem

2012 ◽  
Vol 370 (1975) ◽  
pp. 4576-4593 ◽  
Author(s):  
David Wallace
Keyword(s):  
Wave Function ◽  
Quantum Mechanics ◽  
Quantum Measurement ◽  
Measurement Problem ◽  
Scientific Practice ◽  
Measurement Theory ◽  
Quantum Measurements ◽  
Quantum Measurement Problem ◽  
Modern Physics ◽  
Conceptual Problems

Decoherence is widely felt to have something to do with the quantum measurement problem, but getting clear on just what is made difficult by the fact that the ‘measurement problem’, as traditionally presented in foundational and philosophical discussions, has become somewhat disconnected from the conceptual problems posed by real physics. This, in turn, is because quantum mechanics as discussed in textbooks and in foundational discussions has become somewhat removed from scientific practice, especially where the analysis of measurement is concerned. This paper has two goals: firstly (§§1–2), to present an account of how quantum measurements are actually dealt with in modern physics (hint: it does not involve a collapse of the wave function) and to state the measurement problem from the perspective of that account; and secondly (§§3–4), to clarify what role decoherence plays in modern measurement theory and what effect it has on the various strategies that have been proposed to solve the measurement problem.

scholarly journals Does particle decay cause wave function collapse: an experimental test

2003 ◽  
Vol 308 (5-6) ◽  
pp. 323-328 ◽  
Author(s):  
Spencer R. Klein ◽  
Joakim Nystrand
Keyword(s):  
Wave Function ◽  
Experimental Test ◽  
Wave Function Collapse ◽  
Particle Decay

scholarly journals If the propagator of QED were reversed, the mathematics of Nature would be much simpler

2020 ◽  
Vol 18 ◽  
pp. 129-153
Author(s):  
Jeffrey Boyd
Keyword(s):  
Wave Function ◽  
Path Integral ◽  
Quantum Electrodynamics ◽  
Probability Amplitude ◽  
Integral Approach ◽  
Everyday Experience ◽  
Wave Function Collapse ◽  
Path Integral Approach ◽  
Classical World ◽  
The Many

In Quantum ElectroDynamics (QED) the propagator is a function that describes the probability amplitude of a particle going from point A to B. It summarizes the many paths of Feynman’s path integral approach. We propose a reverse propagator (R-propagator) that, prior to the particle’s emission, summarizes every possible path from B to A. Wave function collapse occurs at point A when the particle randomly chooses one and only one of many incident paths to follow backwards with a probability of one, so it inevitably strikes detector B. The propagator and R-propagator both calculate the same probability amplitude. The R-propagator has an advantage over the propagator because it solves a contradiction inside QED, namely QED says a particle must take EVERY path from A to B. With our model the particle only takes one path. The R-propagator had already taken every path into account. We propose that this tiny, infinitesimal change from propagator to R-propagator would vastly simplify the mathematics of Nature. Many experiments that currently describe the quantum world as weird, change their meaning and no longer say that. The quantum world looks and acts like the classical world of everyday experience.

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