Famous quantum experiment could be shrunk to the size of a single atom

The double-slit experiment shows how light can act as a wave

Timm Weitkamp/Wikimedia, CC by 3.0

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…

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