Locality in quantum theory is not one interchangeable condition. Spatial concentration of a wave packet concerns a state description. Quantum no-signalling restricts operational changes of remote statistics. Microcausality concerns commutation of spacelike observable algebras. The spectrum condition constrains energy-momentum and stability, while primitive causality concerns determination of future-domain expectations by initial-region data. The distinctions are clearest when all five are discussed; none should be replaced silently by the Bell factorization examined elsewhere.
Wave-function tails and entangled correlations are not by themselves controllable signals. Conversely, absence of signals does not by itself supply a local initial-value dynamics or positive-energy spectrum. Each claim must specify the observable algebras, allowed operations and relevant causal regions.
Articles by others on the same topic
There are currently no matching articles.