HK physicists prove single photons do not exceed the speed of light

Hong Kong physicists say they have proved that a single photon obeys Einstein’s theory that nothing can travel faster than the speed of light — demonstrating that outside science fiction, time travel is impossible.

A group of physicists at the Hong Kong University of Science and Technology (HKUST) led by Prof Shengwang Du reported the direct observation of optical precursor of a single photon and proved that single photons cannot travel faster than the speed of light in vacuum. HKUST’s study reaffirms Einstein’s theory that nothing travels faster than light and closes a decade-long debate about the speed of a single photon.

via HK physicists prove single photons do not exceed the speed of light.

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