Science Forums 2

[Boof-head]

Look at 'entangled-time' like this: a photon is timeless, it has a unitary lifetime - it gets 'created' and propagates in some direction, it gets 'annihilated' by being absorbed. The interaction occurs independently of space or time, from the perspective of a photon's energy; it occurs in space and time for observers in relative motion.
The last is only true when (iff) one observer creates the "event" and the other observes, or absorbs the event.

Entanglement occurs here because the emitting and absorbing particles become 'entangled' by the transition; this entanglement is determined at the moment of photon creation, and 'vanishes' at the moment of annihilation - these moments are the same for the photon's momentum energy; the worldline 'appears' when the entanglement disappears.

With 'randomly created' radiation, like from celestial objects, the entanglement paradigm implies that an electron 'knows' where to send a photon signal; but this is our misunderstanding - light propagates in all directions as a spherically expanding wavefront, so "a photon" is part of the transverse area of such a propagating wavefront; however photons do propagate and they do find another electron or other charged particle eventually (even if it takes forever, remember photons don't care about forever), which suggests a photon 'knows what to do and where to go' all by itself. The universe is intrinsically entangled.

Note, this is all a bit of an abuse of meaning - entanglement and superposition are treated differently, and here I am using them in similar ways (horrors!). But they are fundamentally very similar and very quantum-weird.