What do you think actually counts as a quantum measurement?
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I’ve been trying to understand the quantum measurement problem more clearly. Operationally, the procedure is a quantum state evolves, we measure it, obtain a classical result and update the state according to the Born rule. What I still find difficult is the physical meaning of that process. At what point does an ordinary quantum interaction become a measurement? Is collapse a real physical event, an effective description produced by decoherence, or does collapse never occur at all? I understand that quantum computing can work perfectly well without resolving this question - we calculate the outcome probabilities and update the state after observing the result. But that still leaves the conceptual gap between unitary evolution, entanglement with the apparatus, decoherence, and one definite observed outcome. Which approach to the measurement problem do you find most convincing and why? submitted by /u/0xhokugava [link] [comments]