I never said it wouldn't. I agreed up front that this would detect a bomb without interacting with it 50% of the time. It's a minimally-functional bomb-tester, and the way you would optimize it is by layering the original bomb-testing apparatus over this apparatus. The two effects are pretty much completely orthogonal.
ETA: Did you just downvote my half of this whole comment chain? Am I actually wrong? If not, it appears that you're frustrated that I'm reaching the right answer much more easily than you, which just seems petty.
Also, these are not nit-picks. You were setting the problem up entirely wrong.
Sorry I don't hang around here much. I keep meaning to. You're still the ones I come to when I have no clue at all what a quantum-physics article I come across means though.
http://io9.com/heres-a-photo-of-something-that-cant-be-photographed-1678918200
So. Um. What?
They have some kind of double-slit experiment that gets double-slitted again then passed through a stencil before being recombined and recombined again to give a stencil-shaped interference pattern?
Is that even right?
Can someone many-worlds-interpretation describe that at me, even if it turns out its just a thought-experiment with a graphics mock-up?