Joel Dobrzelewski:
> I know this is not a popular view, but I am not convinced of the validity of
> such experiments.  One proponent of the realist opinion, who has better
> arguments than I, is Caroline Thompson:
> http://users.aber.ac.uk/cat/

Yes, I know. But chances for loopholes are very narrow, after
20 years, unfortunately.

> I admit I'm not too familiar with these concepts or terms.  I'll try to read
> up and understand them a little better.
> In the mean time, my main objection to non-local phenomena is, once again,
> our inability to formally implement it.
> Challenge: write a set of non-local equations or a non-local computer
> program that isn't implemented locally.
> For example:
> It would be easy enough to program a virtual reality simulation to exhibit
> seemingly non-local behaviors.  We could even do something extremely
> macroscopic like joining the motion of two pool balls firmly together - so
> that whenever one was moved, the other moved also - seemingly
> instantaneously.

Very interesting. For local vs non-local experiments and effects 
with (two separated) computers see:
www.maths.nottingham.ac.uk/personal/sjw/abstracts/accardi.html 

http://volterra.mat.uniroma2.it/ 
the link "probability and quantum ...."

Have a look also to: 
http://arxiv.org/abs/quant-ph/0007019
Non-locality and quantum theory: new experimental evidence
Luigi Accardi, Massimo Regoli
Starting from the late 60's many experiments have been performed 
to verify the violation Bell's inequality by Einstein-Podolsky-Rosen 
(EPR) type correlations. The idea of these experiments being that: 
(i) Bell's inequality is a consequence of locality, hence its experimental 
violation is an indication of non locality; (ii) this violation is a typical
quantum phenomenon because any classical system making local 
choices (either deterministic or random) will produce correlations 
satisfying this inequality. Both statements (i) and (ii) have been criticized 
by quantum probability on theoretical grounds (not discussed in the present 
paper) and the experiment discussed below has been devised to support
these theoretical arguments. We emphasize that the goal of our experiment 
is not to reproduce classically the EPR correlations but to prove that there 
exist perfectly local classical dynamical systems violating Bell's inequality.

http://arxiv.org/abs/quant-ph/0007005
Locality and Bell's inequality
Luigi Accardi, Massimo Regoli
We prove that the locality condition is irrelevant to Bell in equality. 
We check that the real origin of the Bell's inequality is the assumption 
of applicability of classical (Kolmogorovian) probability theory to quantum 
mechanics. We describe the chameleon effect which allows to construct 
an experiment realizing a local, realistic, classical, deterministic
and macroscopic violation of the Bell inequalities.

http://arxiv.org/abs/quant-ph/9606019
A Proposed Experiment Showing that Classical Fields 
Can Violate Bell's Inequalities
Patrick Suppes (Stanford University, USA), J. Acacio de Barros 
(Federal University at Juiz de Fora, Brazil), Adonai S.
Sant'Anna (Federal University at Parana, Brazil)
We show one can use classical fields to modify a quantum optics experiment 
so that Bell's inequalities will be violated. This happens with continuous 
random variables that are local, but we need to use the correlation matrix 
to prove there can be no joint probability distribution of the observables.

For "joining the motion of two pool balls firmly together", etc. see
http://arxiv.org/abs/quant-ph/0007044
The Violation of Bell Inequalities in the Macroworld
Diederik Aerts, Sven Aerts, Jan Broekaert, Liane Gabora
We show that Bell inequalities can be violated in the macroscopic world. 
The macroworld violation is illustrated using an example involving connected 
vessels of water. We show that whether the violation of inequalities occurs in 
the microworld or in the macroworld, it is the identification of nonidentical events 
that plays a crucial role. Specifically, we prove that if nonidentical events are 
consistently differentiated, Bell-type Pitowsky inequalities are no longer violated, 
even for Bohm's example of two entangled spin 1/2 quantum particles. 
We show how Bell inequalities can be violated in cognition,
specifically in the relationship between abstract concepts and specific 
instances of these concepts. This supports the hypothesis that genuine quantum 
structure exists in the mind. We introduce a model where the amount of 
nonlocality and the degree of quantum uncertainty are parameterized, 
and demonstrate that increasing nonlocality increases the degree of
violation, while increasing quantum uncertainty decreases the degree of violation.

and for Bohm-Aharonov effect and weird jamming:
http://arxiv.org/abs/quant-ph/9605004
Action and Passion at a Distance: An Essay in Honor of Professor 
Abner Shimony
Sandu Popescu, Daniel Rohrlich
Quantum mechanics permits nonlocality---both nonlocal correlations 
and nonlocal equations of motion---while respecting relativistic 
causality. Is quantum mechanics the unique theory that reconciles 
nonlocality and causality? We consider two models, going beyond 
quantum mechanics, of nonlocality---``superquantum" correlations, 
and nonlocal ``jamming" of correlations---and derive new results for 
the jamming model. In one space dimension, jamming allows reversal 
of the sequence of cause and effect; in higher dimensions, however, 
effect never precedes cause. 

http://arxiv.org/abs/quant-ph/9508001
Jamming non-local quantum correlations
J. Grunhaus, S. Popescu, D. Rohrlich
We present a possible scheme to tamper with non-local quantum 
correlations in a way that is consistent with relativistic causality, 
but goes beyond quantum mechanics. A non-local ``jamming" 
mechanism, operating within a certain space-time window, would 
not violate relativistic causality and would not lead to contradictory 
causal loops. The results presented in this Letter do not depend 
on any model of how quantum correlations arise and apply to any 
jamming mechanism. 

Thanks,
- Scerir











Reply via email to