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.

An experiment outlined by a UCL (University College London)-led team of scientists from the UK and India could test whether relatively large masses have a quantum nature, resolving the question of ...

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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 ...