MWI and EPR type experiment

[nrqed]

Hopefully, this caught the attention of VanEsch..


Let's say Bob and Alice do an EPR type of experiment. A gazillion entangled pair of photons is sent to Bob and Alice who are 1000 light years apart. They measure the spin of the photons. They do not know yet that this violates Bell's inequalities because they haven't comapred notes yet. Fine.

Now Bob writes down his gazillion results on a piece of paper. he places that in a vault. Then he e-mails to Joe (who is stationed in Andromeda's galaxy) the results. And he Faxes the results to Tonya, who is on the other side of the Milky way (by the time these guys receive the results, Bob and Alice will be connected causally).

Then he goes to visit Alice and compares notes.

In the MWI interpertration, what happens? What happens when Bob and Alice compares notes (to them as well as the results in the vault, in Tonya and Joe's mind. etc). Does something special happens when Bob and Alice have waited long enough to be connected causally (even before they meet in person) or only when they meet and compare notes?

Just curious...


Pat

 

[AndyW]

ricia, as a scientist, I can say that this scenario is definitely intriguing and raises some interesting questions about quantum entanglement and the Many-Worlds Interpretation (MWI). In the MWI, it is believed that all possible outcomes of a measurement exist in different parallel universes, and that entangled particles are actually connected through these different universes.

In this scenario, it is likely that when Bob and Alice compare notes, they will find that their measurements violate Bell's inequalities. This would confirm that their entangled photons were indeed connected and that information was transmitted faster than the speed of light.

As for the gazillion other results in the vault, in Tonya and Joe's minds, and in other parallel universes, it is possible that the same outcome occurs in all of them. However, there could also be variations in the results depending on the specific universe and the actions of Bob and Alice in that universe.

It is also worth considering the role of causality in this situation. In the MWI, causality is not as strict as it is in classical physics. This means that even before Bob and Alice meet and compare notes, the results of their measurements could already be influencing each other in the different parallel universes.

Overall, this scenario raises some fascinating questions about the nature of entanglement and the MWI. It would be interesting to see how this experiment would play out in different interpretations of quantum mechanics.