Title: quantum mechanics - Observer effect, do this mean literally someone or just any interaction with other matter? - Physics Stack Exchange
Headings: 
Observer effect, do this mean literally someone or just any interaction with other matter?
5 Answers
5
Not the answer you're looking for? Browse other questions tagged quantum-mechanics measurement-problem observers or ask your own question.

Content: This remains an unsettled problem because from the physicists view it simply isn't important. Not knowing what counts as a measurement and what doesn't turns out to not matter much. We can do all the calculations we care to without making the distinction. You can read more about this if you like; Wikipedia is a good place to start: the measurement problem. As a preview, there are some interpretations of quantum mechanics where the distinction is entirely meaningless. There is no 'quantum observer effect' (or wavefunction collapse, as it is known technically). The Stanford Encyclopedia of Philosophy also has a number of good articles on the measurement problem and interpretations of quantum mechanics. I don't understand you last few questions.