Based at Hong Kong University of Science and Technology, the scientists focused on measuring how quickly a photon—"the fundamental quanta of light"—can travel; not as fast as light can, they concluded:
"By showing that single photons cannot travel faster than the speed of light, our results bring a closure to the debate on the true speed of information carried by a single photon," said [research team leader] Du [Shengwang], assistant professor of physics.
"Our findings will also likely have potential applications by giving scientists a better picture on the transmission of quantum information."
The scientists' research paper appears in Physical Review Letters.
Discovery News
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