Nick_Tarleton comments on Distinct Configurations - Less Wrong
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Remember, in the real world, all of this happens in a continuous configuration space with a differentiable amplitude distribution.
So, in reality, since gravitational interactions and whatnot cause the photon to always have a tiny effect, even with no sensor, it will very rarely show up at Detector 1. And as the level of interaction with the rest of reality increases, P(D1) approaches 50%. Right?
and this is de-coherence? This is why the macro-world is seemingly classical? There are some many elements in the system that you never get anything that doesn't intact with something else and all the configurations are independent?