Why is QM (almost) local, with one exception?

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The discussion centers on the locality of quantum mechanics (QM) and its implications, particularly in the context of unitary quantum mechanics (also known as the Many-Worlds Interpretation, MWI). It asserts that while QM appears local, the presence of entanglement presents a challenge to this notion. The conversation references Max Tegmark's work on the hierarchy of systems and their bound states, suggesting that locality may facilitate the isolation of systems, allowing them to maintain memory. The inquiry raises questions about the nature of reality as described by the Hamiltonian and its mapping into three-dimensional space.

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tzimie
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... except one weak exception of the entanglement?

Assuming that unitary QM (aka MWI) is a-local (c) Demystifier, and the ultimate reality is the Hamiltonian, somehow mapped into our 3D space, it is more surprising that the nature we observe is local. If would be more logical to expect multiple H->3D mapping "artifacts" manifesting here and there.

Is it explained by AP and the fact that locality allows systems to be isolated, undisturbed and hence to keep memory? May be I had missed it, but Max Tegmark ( http://arxiv.org/abs/1401.1219 ) has mentioned the hierarchy of systems and their bound states (which is based on AP), but not the locality.

Thanks.
 
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