If you go back to last years work on splitting an atom into two places you will notice we have to be careful in our description
http://planetsave.com/2012/06/05/atom-sp...ntum-mechanics/In this experiment, the researchers succeeded in keeping a single atom in two places more than 10 micrometers apart, that’s a one-hundredth of a millimeter. That is an enormous distance for an atom.
“The atom has kind of a split personality, half of it is to the right, and half to the left, and yet, it is still whole,”
This isn’t visible directly, though. If you shine a light on the atom, the split will collapse.
So although you can measure and see interactions to infer the atom is in both places you can't directly observe it in both places at the same time ... it is very much like looking for the end of a rainbow.
So does it exist in two places depends directly on how you define "exist".
The result seems somewhat ridiculous in classic physics but it is not as strange as it appears if you think carefully about the nature of atoms. Try following the discussion link
http://sciencequestionswithchris.wordpress.com/2013/04/16/do-atoms-ever-actually-touch-each-other/The waveform nature of the universe is very different to the solid classic physics world and trying to define a common state like "exist" can be very problematic.
