The bet on Christian's experiment
I sent the following email on April 23, to Andrei Khrennikov, Hans de Raedt, Gregor Weihs. An identical copy was later sent to Joy.
A draft text had earlier been posted by me on Google groups. The text was also discussed on the FQXi forum. Joy made one correction, which I incorporated in the text sent to the adjudicators.
A draft text had earlier been posted by me on Google groups. The text was also discussed on the FQXi forum. Joy made one correction, which I incorporated in the text sent to the adjudicators.
Richard wrote:Dear Andrei, Hans, Gregor
Here is the protocol which Joy and I have agreed on.
Richard
====================================================
Christian's experiment http://arxiv.org/abs/0806.3078
(N exploding balls, and analysis of a a lot of video footage of those
explosions) generates two computer files each containing N directions
of angular momentum. The files will actually be plain text files
with the directions encoded using spherical coordinates
theta (azimuth), phi (zenith).
Let's call the directions of angular momentum in Alice's file u_k, k=1,...,N,
and in Bob's file v_k, k = 1, ..., N
If I pick measurement directions a and b,thinking now of directions
as unit vectors in R^3, then according to Christian's
experimental paper the outcomes left and right are
A_k = sign(a . u_k) and B_k = sign(b . v_k),
and the estimated (observed, sample, experimental ...) correlation is
E(a, b) = 1/N sum_k A_k B_k
= ( N(++) + N(--) - N(+-) - N(-+) ) / ( N(++) + N(--) + N(+-) + N(-+) )
in the obvious notation.
Christian predicts the theoretical (population, large N limit, ensemble)
correlation rho(a, b) = - a . b = - cos(angle between a and b)
Now we are going to look at two possible directions for Alice and two
for Bob. They are all in the equatorial plane so they can be described
just by azimuthal angles alpha = 0 and 90 for Alice and beta = 45 and
135 for Bob.
Christian's theory has
rho(0, 45) = - 0.7071...,
rho(0, 135) = + 0.7071...,
rho(90, 45) = - 0.7071...,
rho(90, 135) = - 0.7071....
and he predicts therefore
E(0, 45) = - 0.7071...,
E(0, 135) = + 0.7071...,
E(90, 45) = - 0.7071...,
E(90, 135) = - 0.7071....
Of course there may be some experimental and statistical error
(but N will be large - Joy and his experimenter determine how large).
I will win my bet if I show him that one of these four predictions is off target,
by an amount 0.2 or more (ie the absolute value of the difference between
observed and predicted is 1/5 or more).
He will give me two computer files named, for instance, "AliceDirections.txt"
and "BobDirections.txt"
I claim that I'll be able to show him that one of his four predictions has failed
by a large amount: E(alpha, beta) is off target by at least 0.2
If I succeed, I win. If not, I lose.