The classic double-slit experiment of quantum physics involves shining light through two narrow gaps to show that it can behave as a wave – now it seems the slits can be entirely replaced by a single atom.
The double-slit experiment dates to the 1800s. When light is shined through two adjacent narrow slits and onto a screen, it forms a pattern of stripes. This is the result of light behaving like a wave, with ripples from the two slits both boosting and cancelling each…