Wow, talk about sensitive:

http://pubs.acs.org/cen/topstory/8129/8129notw5.html

Single-electron transistor coupled with GaAs laser beam senses
movement down to femtometer level. It mentions the future possibility
of being able to detect Heisenberg uncertainty effects. Now that's
what I call Quantum Behavior analysis.

CoolChips ( www.coolchips.com ) mentioned that their cooling chip
device uses capacitance to sense the proximity between the 2 sides of
their nano-thickness quantum tunnelling gap, to maintain that gap for
cooling purposes.

What if they used this femto-sensitive type of detector to maintain an
even tighter gap thickness?

Gordon D. Pusch

than a nanometer apart, the electron
orbitals of the atoms on the two sides of the gap will begin to
interpenetrate each other, and there will no longer _be_ a gap ---
there will just be two chunks of molecularly bonded metal !!!