Originally Posted By: Orac
They are measuring the actual spin of the particle via a weak measurement (http://physicsworld.com/cws/article/news/46193) and EM wave simply would not give the results they produce.

That information is either misrepresented or misinterpreted.

The diagram does not present a picture of what actually takes place (i.e. as would a camera) but is a computer generated picture of what is thought to be happening however on the assumption that the diagram depicts what is assumed to take place between the slit card and the target card it shows photons appearing at the back of the slit card at locations where the slits do not exist.

Text books show that a single photon arrives at the target card location as a single pinpoint of light that is located at some position along the curve shown in that diagram but not as an entire curve.

They also show that a series of single photons aimed at the target card will eventually add up to and produce that curve and I believe that this is what that diagram depicts.