I still think it's a April fool's joke, but I have been wondering:
How to make a grain of silver nitrate distinguish between a photon
coming from one direction vs another?
If indeed this could be done, then we could well be on our way.......
I'm sure there is advanced technology out there in the universe somewhere where this might be commonplace.
And if this is truly a joke, then they really pulled all the stops to make it appear valid. There is a Sebastien Fray at the Plank Institute, and he does work with quantum optics.