X-Message-Number: 13728
From: 
Date: Mon, 15 May 2000 05:30:25 EDT
Subject: Non X-ray brain reader

Brain reading without X-rays.

Some dislike everything with a name as x-rays, radiation or nuclear, so is 
there an
"ecological" version of the brain reader? I'll try to answer that question 
here, my main
objective is to identify an alternative issue if some key componment in the 
x-ray
system was unworkable or too difficult to master. My proposal is the 
correlated ligth
photon with giant tunnel effect.

The basic idea is to work with visible spectrum ligth where each photon has 
only 3
eV energy and no ionizing power. Quantum nondemolition is then no more 
requested.
A beam with many correlated photons allows to get the 100 nm resolution. If 
the
brain can be cut in slices one millimeter thick, all is good, the problem is 
solved. My
own feeling is that an information retrivial system must be nondestructive 
and so
must work on brain in a head. The bones are then a problem. The solution 
would be
to use the tunnel effect to overcome that difficulty.

The tunnel effect is a quantum process where a wave travel throughout an 
obstacle if
this one is no more than some wavelengths thick. In a quantum wave packet, 
three
lengths must be taken into account:
1/ the wavelength L1.
2/ the domain where the wave amplitude of the packet is significant L2. L2 is 
10 to
100 times larger than L1.
3/ the wave packet L3. L3 is very large, For one foot to many miles.

In the optical domain, L1 is half a micrometer, L2 is near 10 micrometers and 
L3 is
30 centimeters in the Sun ligth and more than 100 m in some lasers. In the 
tunnel
process, the maximum amplitude of the wave is pushed off center in L2 and so 
the
photon maximum likehood presence probability is displaced. This process can't 
go
beyond L2 because here the wave has a near zero presence probability. Now, if 
the
waves travel in a dispersive medium, a milk-like matter, the maximum 
amplitude in
L2 goes down and L2 gets larger. Because photons are spin 1 particles, they 
obey the
Bose Einstein statistics and tend to condensate in the same quantum state. 
This
produces a bunching effect. If L2 becomes larger with no well deffined maximum
amplitude, there is no more photon preffered localization and so no bunching
possibility. This is called a unbunching quantum state. Unbunched photons can 
tunnel
to longuer distance because L2 is larger for them. With very fast systems, L2 
can be
cut, the head is then sent along a path and the tail along another. In the 
end, both are
recombined into a single wave packet. If the head componment is sent 
throughout a
loop where there is a dispersive and a tunnel element, that part will move 
farther and
farther towards the head of L3. When the wave packet is assembled anew, there 
are
two separate L2 domains, may be many centimeter or meters away. Newerthless, 
both
are in the same wave packet L3 and a tunnel effect is possible between them. 
Such a
ligth could travel throughout a brick wall. The brain case is then no more a 
problem.

Yvan Bozzonetti.

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