Live Science May 20, 2026 • 16:52

'Negative time' confirmed: Mind-bending experiment shows light can exit a cloud of atoms before it enters, thanks to quantum physics quirk - Live Science

By Larissa G. Capella

A new experiment confirms that photons passing through a cloud of atoms can spend a negative amount of time there, and the atoms themselves are the ones saying so.

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'Negative time' confirmed: Mind-bending experiment shows light can exit a cloud of atoms before it enters, thanks to quantum physics quirk - Live Science

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