I should like to make a clarification here. I think that some of my statements like :" Light emitted at A ceases to exist as something real and exists instead as an abstract mathematical wave function till it is detected at B and becomes real again, at which point the wave function collapses giving rise to multiple universes." Is causing confusion. I realised that this is because there are many interpretations of quantum mechanics. Dr. Nick lucid can probably explain this better than I can. Here he is in conversation with his wife:
View: https://youtu.be/MYX5Mo7IRqA