X-Message-Number: 20992
From: 
Date: Tue, 28 Jan 2003 10:57:40 EST
Subject: Nano arm

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I have been rather hard these days about current nanotech concepts. I think 
it would be fair to present what I think true nanotech would be. I take here 
the nanomanipulator case as an example.

At near atom scale, there is no rigid, well defined objects and surface, at 
least when simple atom stacking is used. To move atom and molecules with some 
efficacity, tools must have a control system finner than the atom scale they 
want to move. This can't be done with a minute robot arm, even built frm 
single molecules.

You have to use entanglement and squeezed states. What that means in 
practice?
The device could start with a flat crystal surface, large atom would then 
introduced in the crystal latice so an elliptical corral is built. If an atom 
or molecule is put at one ellipse foci, its wave function get reflected by 
the corral and concentrate at the second foci. There, a ghosht wave function 
appear. If a second atom or molecule similar to the first is put here, each 
will dump a part of its wave function to the other, the result is an 
entangled pair of atoms or molecules.

The Heisenberg's uncertainty rules imply that there will be some 
"undefiniteness"  in the position and impulsion of atoms. But now that law 
hols for the paired object. we could have more blurring on one atom and less 
on the other. If the last is the "hand" of a manipulator, it could have more 
precision that a classical atom or molecule, this is what quantum mechanics 
call squeezing. this is simply an illustration, I don't describe how 
squeezing is done, it uses interference processes in the corral wave 
reflector. The initial corral experiment was done using atomic force 
microscope to build the fence, made on a clay crystal, billions of copies 
could be build by simple crystal growth. This is a technology readilly 
available today.

Yvan Bozzonetti.


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