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Re: particle position



The basic point is the local or nonlocal character of nature, and with
this, the conceptual relation between quantum mechanics and special
relativity. It is not enough with the formal consistency presented in
the books about quantum electrodynamics and similar subjects.
Scientific rigourosity is always important, but in this case is more
important.

And this is what I find in the papers cited by R. Ebert. Each one of them
is
very careful and they do not establish that Santos' objections are solved.
Just
a few examples to see:

P. Kwiat et al., Phys. Rev. A 49, 3209 (1994) say in page 3215: "A
loophole-free
experiment still seems feasible, although detectors need to be improved
somewhat.", and the title of the paper say PROPOSAL FOR ...

E.S. Fry, T. Walther, and S. Li, Phys. Rev. A 52, 4381 (1995) is going to
the
same goal, but a communication with E.S. Fry would tell us that his
experiment
has results under consideration by himself. And this situation is
maintained since
10 years ago.

The next paper: E. Hagley et al., Phys. Rev. Lett. 79, 1 (1997) say in page
4:
"A 'purity of entanglement' large enough to test Bell's inequality with
massive
particles seems to be within reach", and so on.

The paper: W. Tittel, J. Brendel, etc. Physical Review A57 , 3229 (1998)
is very careful too. They say in page 3231: "...this experiment was not
primarily designed to test local hidden variables. However, it is
interesting
to evaluate by how much the Bell inequality could be violated in such
a long-distance Bell experiment."

On the other hand the arguments against these approchs is maintained.
See for example:

Physics Letters A 10 (1996)
Optical Soc. Amer B, 15, 1572 (1998)
Found.Phys. 27, 765 (1997).

So that the discussion is present, and after more than 30 years of Bell's
inequalities, the experiment to discriminate, without any doubt, between
quantum mechanics and local realism is a matter of hopeness.

Arnulfo Castellanos-Moreno