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Quantum mechanics describes the microscopic properties of nature in a regime where classical mechanics no longer applies. It explains phenomena such as the wave-particle duality, quantization of energy, and the uncertainty principle and is generally used in single-body systems. Use the quantum-field-theory tag for the theory of many-body quantum-mechanical systems.

2 votes
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Scalar product between an original and shifted solid state

Suppose, we have a perfect cubic brick with no imperfections and a rectangular lattice (w=l=h=10cm). Suppose I shift this brick by $\Delta x = 1mm$. What is a scalar product of wave functions before a …
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6 votes
3 answers
744 views

What is a measurement in the Many Worlds Interpretation?

I was reviewing the MWI, and couldn't figure what a measurement is in the MWI? Everett claims that split happens when you measure, but what is it for MWI (not for general QM)? Yes, I know about decoh …
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