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i have a question regarding the Many World Interpretation of quantum mechanics and how it explains the entanglement of two particles..

From my understanding, entangling two particles so that an observable of one (es. spin of z axis) is correlated with the same observable of the other particle, is described by MWI as a correlation of the relative states of the particles, so that their joined state is described by the same wave-function.

In this way, the wave function can determine the probabilities of the outcome of the measurement and can keep the results of the measurements correlated without implying faster than light communication (no info is transmitted, the particles only share the wave-function) or hidden variables. On the other hand, and this is the question, this seems to me to imply a physical reality of the wave-function (as opposed as a tool scientists use to compute probabilities).

So, how can the physical reality of the wave-function be described?

According to (my understanding of) David Deutsch (the fabric of reality), mwi does not need to imply abstract realms where the particles or their histories interact with themselves creating interference effects before being "realized" in our universe after a measurement. Quite simply, every possible story is realized and these actual worlds interact with each other time-simmetrically, as can be seen in interference effects.

Reading Deutsch's book, i had the impression that mwi was the only qm interpretation that could be seen as a fully "materialistic" and self-consistent interpretation. But, thinking twice about it, even mwi imply an abstract but real world of the wave function. Is this correct? And where would that world be? It can't be part of our space-time, nevertheless is real, so "where" is it?

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# MWI, EPR and Deutsch

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