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Zeilinger et-al wrote: "In the entanglement swapping1-3 procedure, two pairs of entangled photons are produced, and one photon from each pair is sent to Victor. The two other photons from each pair are sent to Alice and Bob, respectively. If Victor projects his two photons onto an entangled state, Alice’s and Bob’s photons are entangled although they have never interacted or shared any common past. What might be considered as even more puzzling is Peres’ idea of “delayed-choice for entanglement swapping”4. In thisgedanken experiment, Victor is free to choose either to project his two photons onto an entangled state and thus project Alice’s and Bob’s photons onto an entangled state, or to measure them individually and then project Alice’s and Bob’s photons onto a separable state. If Alice and Bob measure their photons’ polarization states before Victor makes his choice and projects his two photons either onto an entangled state or onto a separable state, it implies that whether their two photons are entangled (showing quantum correlations) or separable (showing classical correlations) can be defined after they have been measured.”

The issue of Antony Valentini’s “signal nonlocality” is whether Alice and Bob can do correlation measurements on ensembles of their photons to tell if they are entangled or not BEFORE Victor makes his choice. If the answer is YES then this is real precognition in a Block Universe. The consensus is that the answer is NO however, that has to be proven both theoretically and experimentally. Indeed, experiment with minds suggests NO as factual. This is still controversial because precognition is considered irrational in mainstream physics.
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