The measurement problem in quantum mechanics refers to the difficulty in understanding how the act of measurement causes a quantum system to transition from a superposition of states to a definite outcome. This issue highlights the puzzling nature of quantum mechanics, particularly regarding how information is gained from a system and how it relates to the wave function collapse. It raises questions about the role of the observer and the nature of reality, connecting deeply with concepts such as superposition, mixed states, and the implications of entanglement in experiments related to Bell's theorem.
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