It seems accurate, but there is more interesting stuff in the link I posted above.
They split a photon into two photons with a longer wavelength, and those photons are 'entangled', meaning that if one is polarized along the x axis, the other is polarized along the y axis no matter what you do to them. Lets call one 'p', and one 's'
1) So when they have 'p' photons hitting a detector, and 's' photons going through the 2 slits and hitting another detector slightly afterwords, the 's' photons form the interference pattern.
2) You stick a special crystal which polarizes the light in front of each of the two slits (both crystals polarize light a different way). You can detect the polarization of 'p' when it hits the detector first (and therefore find the polarization of 's' because of entanglement), and you can find the polarization of 's' afterwords when it has passed through the crystal and hit its detector.
Using the before polarization and the after polarization, you can find out which slit 's' went through. It does not produce an interference pattern.
3) You stick a piece of the polarizing crystal in front of the other photon's detector ('p'), so that it becomes impossible to determine which slit the photon passes through, and the photon produces the interference pattern.
So if you can determine which slit it passes through, it only passes through one slit. Yet if it is impossible for you to determine which slit it goes through, then it goes through both slits simultaneously because both possibilities exist. Wow this is crazy
.
So yeah...something like that, and more...
[EDIT]
(quarter wave plates = polarizing crystal thingy)
Quote: "In case you might be suspicious of the quarter wave plates, it is worth noting that given a beam of light incident on a double slit, changing the polarization of the light has no effect whatsoever on the interference pattern. The pattern will remain the same for an x polarized beam, a y polarized beam, a left or a right circularly polarized beam. "
