In the probabilistic Bohr/Heisenberg Copenhagen Interpretation CI of quantum mechanics from 1930s the word measurement plays a key role, because it is the measurement which decides some actuality out of many possibilities, like the observation of a dead or alive Schrödinger Cat upon opening of the Box somehow deciding an actuality from a possibility of a both alive and dead cat before the opening. The key role of measurement was expressed as follows:
- Bohr: Nothing exists until it is measured. (The Moon does not exist if you are not looking at it)
- Heisenberg: The purpose of quantum mechanics is to predict the outcome of experiments/measurements.
- Bohr: It is wrong to think that the task of physics is to find out how nature is. Physics concerns what we can say about nature.
- When I say that the word "measurement" is worse than the others, I have in mind its use in the fundamental interpretative rules of quantum mechanics.
- It would seem that the theory is exclusively concerned about 'results of measurement', and has nothing to say about anything else.
- However, the idea that quantum mechanics, our most fundamental physical theory, is exclusively even about the results o f experiments would remain disappointing.
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