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The short answer is yes, in quantum mechanics quantum non-locality refers to the apparent instantaneous propagation of correlations between entangled systems, irrespective of their spatial separation. In quantum field theory, the notion of locality may have a different meaning, as pointed out already in a comment. Details: The notions of locality and ...


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My reasoning being that due to Lorentz invariance, if two objects are located at time-like separated spacetime points, then it is possible to find a frame in which they are located at the same spatial point, in which case any direct interaction between the two objects would violate causality (one object would [instantaneously] affect the other despite the ...


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Indeed, the QFT notion of locality is that observables at space-like separation commute, i.e. $$ (x - y)^2 < 0 \implies [\mathcal{O}_1(x),\mathcal{O}_2(y)] = 0 $$ for all local observables $\mathcal{O}_1,\mathcal{O}_2$, which are generically polynomials in the fields and their derivatives. This is our notion of locality because, classically, we know that ...



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