Famous thought experiment. I've read the wiki on it (and other things), and it seems to hinge on this concept of quantum superposition, which seems to be that "any two (or more) quantum states can be added together ('superposed') and the result will be another valid quantum state; and conversely, that every quantum state can be represented as a sum of two or more other distinct states."
That's all fine and good, but I have no idea how this statement suggests anything about a particle existing in two states at the same time, which is what the experiment seems to require if I understand it right. This is where I'm lost, lol.
In particular, I just want to know why it is thought that something can simultaneously exist in two states. Like, what led people to this conclusion?
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