Can an electron-positron pair become entangled? And since the positron behaves as if moving backwards through time, are these particles entangled as if at different points in time?
Can an electron-positron pair become entangled? And since the positron behaves as if moving backwards through time, are these particles entangled as if at different points in time?
Positrons don't move backwards in time in any physical sense. Their mathematical representation is like an electron with a negative time coordinate but this is physically dubious because it fails in curved spacetimes. Electron-positron pairs are entangled because they are correlated by the process that created the pair. Entanglement is just a correlation, not some magical link.
Entanglement is more than just a classical correlation though - it's specifically the kind where the quantum states can't be described independently, which is why Bell's inequalites get violated and why Einstein called it "spooky action at a distanc".