From: scerir (scerir@libero.it)
Date: Sun Mar 02 2003 - 07:35:13 MST
[R. Naam]
[...] I'm being pretty casual here and just assuming
that we can move feature sizes down to .01 microns
and build independent circuit layers of that size and
stack them on top of each other. Other techniques may
in fact take us far past this level.
----
[Joao]
Thanks for all the comments. I needed an injection of optimist.
----
Can I add this?
'Coherent transport of neutral atoms in
spin-dependent optical lattice potentials'
Olaf Mandel, Markus Greiner, Artur Widera,
Tim Rom, Theodor W. Haensch, Immanuel Bloch
4 pages, 6 figures
"We demonstrate the controlled coherent transport
and splitting of atomic wave packets in spin-dependent
optical lattice potentials. Such experiments open
intriguing possibilities
for quantum state engineering of many body states.
After first preparing localized atomic wave functions in
an optical lattice through a Mott insulating phase, we place
each atom
in a superposition of two internal spin states.
Then state selective optical potentials are used to split
the wave function of a single atom and transport the
corresponding wave packets in two opposite directions.
Coherence between the wave packets of an atom delocalized
over up to 7 lattice sites is demonstrated."
http://arxiv.org/abs/cond-mat/0301169
Actually they exploited the fact that the Rb atoms possess
two magnetic 'substates' and have succeeded, by a further
adjustment of the confining laser beams, to separate each
atom into two entangled spatially separated parts.
The aim is to engineer an 'unprecedented' degree of quantum
'entanglement', for computational purposes.
s.
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