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exmarine
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I am re-reading paper(s) by Huw Price and Ken Wharton that present an interesting explanation of entanglement. I will see if I can paste a link, otherwise one can find them on arXiv: one is for example, “Disentangling the Quantum World”. The idea is that there could be retro-casual communication between the particles, an idea first suggested by Costa de Beauregard in the late 1940s (a student of de Broglie!). Basically, a quantum particle could “know” in advance what measurement will be made in its future.
They claim that explanation is compatible with the prohibition of faster-than-light communication in Special Relativity. My question is very specifically limited to that claim. Wouldn’t such a retro-casual explanation require super-luminal retro-communication? If a particle such as a photon knows in advance what type of measurement it will eventually encounter, then that seems to mean that information had to travel back in time faster-than-light. Or else that information had to start the trip even before the photon came into existence? It does not seem to me that their explanation is compatible with Special Relativity.
They claim that explanation is compatible with the prohibition of faster-than-light communication in Special Relativity. My question is very specifically limited to that claim. Wouldn’t such a retro-casual explanation require super-luminal retro-communication? If a particle such as a photon knows in advance what type of measurement it will eventually encounter, then that seems to mean that information had to travel back in time faster-than-light. Or else that information had to start the trip even before the photon came into existence? It does not seem to me that their explanation is compatible with Special Relativity.