On 8/20/2018 2:10 AM, Bruno Marchal wrote:
On 19 Aug 2018, at 21:39, Brent Meeker <meeke...@verizon.net> wrote:
On 8/19/2018 3:37 AM, Bruno Marchal wrote:
So the "many superpositions" that you posit are entirely arbitrary, pulled out
of the air without any justification.
If she measure u, Bob get d. But is she measure u’, Bob get d’ (with certainly, if they have decided to
measure in the same base u’d’ before). To account for that, obviously maintaining locality, we must
take into account the initial uncertainty, due to psi = (|u>|d> - |d>|u>)/sqrt(2) =
(|u'>|d'> - |d'>|u'>)/sqrt(2).
But that is a classical uncertainty as to which detect angle Alice chooses and
you have muddled the picture by leaving the detector and it's angle out of the
equation, and writing only the particle spin part down.
Adding Alice will change nothing,
I said you must include the detector, which has certain angle, and an
interaction term. Then the uncertainty is only whether the detector
says "up" or "down" and there are only two "worlds" that split by
decoherence.
Brent
unless from her point of view if she “irreversibly” memorise her outcome; then
the symmetry is locally broken, but I am not sure for the “universal wave”
describing Alice + Bob + the particles. There is no mixture states there.
Bruno
Brent
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