Comments about "Wave function collapse" in Wikipedia
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Introduction
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In quantum mechanics, wave function collapse is said to occur when a wave function—initially in a superposition of several eigenstates—appears to reduce to a single eigenstate due to interaction with the external world; this is called an 'observation'

Any observation involves a certain change in the outside world. The whole issue is to what extend observations can be described by means of mathematics specific by means of wave functions. To be more specific: by means of wave functions of elementary particle level.

It is the essence of measurement in quantum mechanics and connects the wave function with classical observables like position and momentum.

Measurements of elementary particles, which is part of quantum mechanics, is very difficult and almost every single measurement causes an interaction which what we want to measure. That means to measure the speed of an individual elementary particle is impossible.

Collapse is one of two processes by which quantum systems evolve in time; the other is continuous evolution via the Schrödinger equation.

All processes in the universe evolve in time. All processes are also quantum systems because elementary particles, are part of this. The concept collapse of a wave function is not part this. It is part of a mathematical description of the behaviour of a process if you want to measure the particle.








1. Mathematical description












1.1 Mathematical background












1.2 The process












1.3 The determination of preferredbasis












1.4 Quantum decoherence










2 History and context












3. See also
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Created: 11 January 2019
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