In summary, the question of whether the Many-Worlds Interpretation (MWI) of quantum mechanics is considered local revolves around the nature of quantum events and their implications for locality. Proponents argue that MWI maintains locality since it does not require instantaneous effects to distant events, as all outcomes occur in branching worlds without faster-than-light influences. Critics, however, contend that the interpretation challenges traditional notions of locality by positing a vast multiverse where all possibilities are realized. The debate continues, highlighting the complexities of reconciling quantum mechanics with classical concepts of locality.
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PeterDonis said:
There are no "idler photons" in the experiments discussed.