On 23 Jul 2013, at 16:00, Jason Resch wrote:

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When there are two polarizers A and C, which are rotated by 90degrees to each other then no photons will pass through bothpolarizers. However, if we insert polarizer B at a 45 degree offsetto A and C then 1/4 of the photons will make it through.Now let's say we have two entangled photons travelling away fromeach other. If we send photon #1 through polarizer A right beforephoton #2 goes through polarizer B, right before photon #1 goesthrough polarizer C, then if I understand entanglement correctlythat implies some of the time photon #1 will make it throughpolarizer C. Is that correct?

Yes. Relatively to you.

To me it seems that must be incorrect, because it would enable superluminal communication.

`In a single universe, it looks like there is such a communication, but`

`the math shows that you cannot use it to send information (like with`

`quantum teleportation).`

`But if you look at this in the Everett picture, you can see that there`

`are no superluminal communications at all. By choosing some angle of`

`some polarizer, you determine the type of partitioning of the`

`multiverse you will stay in. May be you can do the computation`

`yourself, and you might be inspired by the computation that Steve`

`Price does in his "Everett FAQ".`

By sending a continuous stream of entangled photons in oppositedirections and changing the orientation of B between 0 and 45degrees, you could cause photons at C to stop with 100% or 75%probability. This cannot be so then what is wrong with the aboveassumptions of how the three polarizer experiment works withentangled photons?

`I think that you are using implicitly the "uniqueness of outcome"`

`somewhere. Not much time to do the details for now, but I might do it`

`later if nobody does it. But you can do it, also, as this needs only a`

`minimal amount of QM. Of course this will not prove that Everett is`

`always "local" in general. For this you can take a look on some paper`

`by Tipler, or more rigorous one by Deutsch and Hayden, but even this`

`is criticized by some physicists.`

Bruno http://iridia.ulb.ac.be/~marchal/ -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.