The experiment showed that Bohr was definitely correct when he argued for complementarity, and that Einstein had got it wrong ...

However, a new study attempts to fill this gap. It suggests that classical interference patterns arise from specific quantum states of light, called bright and dark states.

In the new experiment, the interference pattern showed up as fringes, or additional peaks in the frequency spectra, which are graphs of the measured light intensity at different frequencies.

The new experiment is a twist on a 220-year-old demonstration, in which light shines through two slits in a screen to create a unique diffraction pattern across space, where the peaks and troughs ...