A photon enters a cloud of atoms and emerges on the other side. When physicists calculate how long the atoms remained excited because of that transmitted photon, the answer falls below zero.

New research offers an intriguing variation on the famous experiment, which proved light behaves as both a particle and a wave. Reading time 2 minutes A team of physicists has recreated a classic ...

Add Futurism (opens in a new tab) More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results. Quantum ...

Add Yahoo as a preferred source to see more of our stories on Google. Scientists measured a negative weak value for the time photons left atoms excited, while later studies revealed how quantum ...