On 4/26/2016 10:29 PM, Jesse Mazer wrote:
On Tue, Apr 26, 2016 at 11:51 PM, Brent Meeker <[email protected] <mailto:[email protected]>> wrote:On 4/26/2016 8:38 PM, Jesse Mazer wrote: OK, let's say experimenter A measures particle 1, and experimenter B measures particle 2. Any given copy of particle 1 has a "label" that says something about the state of 2--we can imagine that the copy of particle 1 carries a little clipboard on which is written down both its own quantum state, and a quantum state it assigns to particle 2. When that copy of 1 is measured, it not only adjusts its own state (to an eigenstate of the measurement operator), it also adjusts the state it has written down for 2. You seem to be assuming, in effect, that when a copy of 1 adjusts what it has written down for the state of 2 on its own clipboard, this must mean that copies of 2 also instantaneously adjust what they have written down about *their* own state. However, in a copying-with-matching scheme, there's no reason this need be the case! That's pretty much the many-universes model that Bruno proposes. But it's non-local in the sense that the "matching scheme" must take account of which measurements are compatible, i.e. it "knows" the results even while they are spacelike separated.Why do you say that? Do you understand that in the type of scheme I am talking about (and Mark Rubin too, I think), no "matching" between copies of measurement-outcomes at different locations takes place at any location in spacetime that doesn't lie in the future light cone of both measurements?
I think I understand it. Consider a spacelike slice that contains the earliest overlap of the A and B measurment events forward lightcones. On this slice the proper correlated results must obtain, which means that observers at opposite sides of the lightcones from the overlap must also observe the proper correlation - even though they are spacelike relative to the overlap and spacelike relative to one of the measurement events.
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