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A quantum observable is a measurable operator whose corresponding property of the state can be determined by some sequence of physical operations ("observation"), such as submitting the system to various electromagnetic fields and eventually reading a value. In systems governed by classical mechanics, any experimentally observable value can be shown to be given by a real-valued function on the set of all possible system states.

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What exactly is the 'observer' in physics and/or quantum mechanics?

An "observer", in this case, is anything that can "see" or observe and remember or record the event. The main point is that the observer can record the event. For example if you where to put this expe …
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