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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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  • $\begingroup$ There is a trivial answer which is probably not what you want: two timelike separated events are always causally connected (see physics.stackexchange.com/a/217805/109928). Maybe you could reformulate the question so that what you have in mind is made clearer. $\endgroup$ – Stéphane Rollandin Apr 8 '18 at 15:57
  • $\begingroup$ If a single quantum experiment is being performed in an inertial system ,does the preparation procedure causally precedes the measurement process in all inertial frames? $\endgroup$ – user191891 Apr 9 '18 at 3:06
  • $\begingroup$ If yes , it seems to me to be a feature which is additionally incorporated , rather than arising from quantum theory itself.Is that right? $\endgroup$ – user191891 Apr 9 '18 at 3:07

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