🚀 go-pugleaf

If this is indeed the proposal from Physics Essays, then I have a few comments:
That proposal has a fundamental, but subtle flaw, which may remain in this
proposal.

In Sarfatti's Physics Essay article, he uses a spin-flip process to
disentangle the correlated states:
        (|v1>|v2>+|h1>|h2>)/(sqrt(2))
becomes
        (|v1>|v2>+|h1>|v2>)/(sqrt(2))
which is
        (|v1>+|h1>)|v2>/(sqrt(2)).

 This is clearly the source of the problem, for if this REALLY describes
a linear evolution on system 2 only, then it does not in general
conserve probability, as seen by the fact that it implies
     |h2> -> |v2>
     |v2> -> |v2>
so that
     |h2>+|v2>  -> 2|v2>
and
     |h2>-|v2>  -> 0  (normalize this final state ;)

    On the other hand, we can interpret the dynamics as being
     |h1>|h2> -> |h1>|v2>
     |v1>|v2> -> |v1>|v2>
    which, with normal QM results in a transition matrix

    hh  hv  vh  vv
 hh 0   1   0   0
 hv 1   0   0   0
 vh 0   0   1   0
 vv 0   0   0   1

which is nonlocal in that it does not factor into a product involving
independent evolution.  Hence, it is Sarfatti's nonlocal spin-flip
which introduces the  FTL communication possibilities, and not
the original entanglement of the of the two photons.

Surely someone has already pointed this out in the literature.
It seems analogous to the demonstration that you "can't clone
a quantum" (Wooter's & Zurek?). If note, can somebody send me the
editor's adress at Physics Reports. ;)


It might be useful if some quantum optics person where to actually
describe for us the quantum mechanics of polarization rotation.

mike gallis
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