An experiment that’s causing somewhat of a stir

Ah, it’s been a while since I heard ‘Copenhagen-interpretation’. You may say that said interpretation is the quantum mechanics sister to our well-known I only believe/It’s only real what I see. In terms of particle / wave duality, the interpretation states that I can only make an observation of the wave or particle aspect of a subatomic spacetime entity at any time.

Anyway, via Newscientist I heard of one Shariar S. Afshar performing a new take on the double-slit experiment with photons. He sets up an experiment by which he figures out through which slit a ‘photon’ passed and proves at the same time that an interference pattern is given.

Interesting stuff, and there is some commenting going on at Kathrin Cramer’s weblog. btw, here is a good picture of the double-slit experiment as seen in the current Newscientist issue.

I have actually two questions about this experiment:

I posted these questions as comments at Kathrin’s weblog in the hope to get pointers.

Either way, I always thought that saying something like particle/wave duality tells more about our capabilities than it actually tells us about nature.