I wonder if anybody can steer me in the right direction; I'm having no luck with google-fu. I remember reading somewhere that it was demonstrated that you could set up the double-slit experiment so that single photons going through slits would create an interference wave even if they were no in the detector at the same time. In other words, that they interfere even when they are separated in time. I would guess the experimental setup would be something like opening slit A and letting a photon go through, then closing it and opening slit B, and letting a photon go through. I remember vaguely that it was done by somebody with a name that started in A, like Ansari or something like that, but I could be totally wrong about the name.
Anybody have any idea what I'm talking about?