If we consider a quantum preparation procedure on a system followed by a projection measurement as constituting two sequential events in space-time (which seems plausible ,given that the Copenhagen interpretation demands us to describe quantum processes in terms of observable changes in the classical apparatus. We could for instance make a particular led light to glow for a particular ket's realization in the measurement process . That could constitute an event in space time .) , are these two events causally connected for any particular measurement outcome?
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