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QuantumLive Science
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83% Informative
Researchers led by Daniela Angulo of the University of Toronto have revealed another oddball quantum outcome.
They say photons, wave-particles of light, can spend a negative amount of time zipping through a cloud of chilled atoms.
In other words, photons can seem to exit a material before entering it.
The measurement results suggest that the photons moved through the medium faster when they excited atoms than when the atoms remained in their ground state.
"When you see a transmitted photon, you can't know which of these occurred," Steinberg says.
"Their results raise interesting questions about the history of photons traveling through absorptive media," Sinclair says.
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