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In studying QM, it's been very abstract. I'll read things such as, we get an eigenvalue when we measure an observable. Or we prepare an ensemble of particles in the state [itex] \Psi [/itex]. I understand this in an abstract way, but I don't understand what it actually means to get an eigenvalue when a measurement is made. How is an eigenvalue "observed" in the laboratory? This is just one example but I'm looking for a textbook that ties these sorts of things in Quantum theory to the experimental side of things. Not necessarily a textbook but any source. Any suggestions? Thanks