3 ms·
That's called decoherence, and it doesn't actually collapse the wave function, it just spreads it out over everything. The measuring device, observer, labarator
by goatlover 2y ago
That's called decoherence, and it doesn't actually collapse the wave function, it just spreads it out over everything. The measuring device, observer, labaratory, etc all become entangled.
You need an additional assumption that collapse actually occurs to get rid of the world being in a massive superposition we can't observe, if you don't want Many Worlds Interpretation.
Also, physical reality is made up of quantum systems, so there is a real question as to whether the classical is actually quantum. MWI and some other realist interpretations like Bohmian Mechanics would say yes. The Copenhagen Interpretation would say the math is just a predictive tool and we don't know what's actually going on when not making measurements.
- inshard 2y agoI feel entanglement post measurement is the exchange of which way information with a classical system (all matter beyond a mass threshold when other forces override quantum uncertainty). Which way information integrity is critical and is non local (see delayed choice quantum eraser). But reality is mostly classical, a network of entanglements starting from the Big Bang, crystallized which way information.