What is Copenhagen's interpretation of quantum mechanics
Interpretation of the wave functions
Probably the most successful interpretation of the wave function is that Copenhagen interpretation. She left for Copenhagen School Niels Bohr named, although actually from Max Born was introduced in Göttingen. Max Born received the Nobel Prize for this. In Copenhagen this interpretation was then further developed and interpreted by Werner Heisenberg, Erwin Schrödinger and others.
According to the Copenhagen interpretation, the particle is not located in a certain place, but at the same time in all places where the wave function is not zero. The wave function, or more precisely its square of the magnitude, is interpreted as a probability distribution.
Only at the moment of a position measurement does the wave function collapse and a particle is created at a certain point. This collapse of the particle wave is controversial, in many cases correct results can be obtained without assuming a collapse of the wave function. However, this collapse is very helpful for practical use, as it simplifies further calculations.
Albert Einstein the probability interpretation of the wave function was always a thorn in the side. He suspected that quantum mechanics is not the complete description of nature, but that hidden variables stuck behind the wave function. He underscored this view with the famous sentence: "God does not roll dice." However, modern measurements have shown that there are probably no hidden variables that provide more information about the location of the particle than the wave function.
Also Erwin Schrödinger was not convinced of the probability interpretation at the end of the 1920s. He considered this interpretation to be a preliminary, incomplete description of quantum phenomena. With a famous thought experiment he wanted to show the problem of quantum theory. According to the interpretation of probability, the Schrödinger cat should be dead and alive at the same time, as long as you don't look into the box. Today, however, the interpretation of the wave functions by probabilities has proven itself to such an extent that one can experimentally create systems that have similarities to Schrödinger's thought experiment. Such states are called Schrödinger cat states.
There are also more philosophical interpretations, such as the many-world theory, which assumes that the universe splits into many worlds with every measurement. However, these theories cannot be physically differentiated from the probability interpretation.
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Dead or alive: How the verdict on Schrödinger's cat is spoken from the Internet magazine Wissenschaft.de
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Last change: 23.10.2011
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