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Shengwang Du
Shengwang Du is an associate professor in the department of physics at Hong Kong University of Science and Technology.
He is noted for having led a team that performed an experiment showing individual photons cannot travel faster than the speed of light (''c'') in a vacuum, thus apparently removing one approach to time travel.〔(''It's official: Time machines won't work'', Los Angeles Times July 25 2011 )〕〔(HKUST Professors Prove Single Photons Do Not Exceed the Speed of Light )〕
Du claims in a peer reviewed journal to have observed single photons' precursors, saying that they travel no faster than ''c'' in a vacuum. His experiment involved slow light as well as passing light through a vacuum. He generated two single photons, passing one through rubidium atoms that had been cooled with a laser (thus slowing the light) and passing one through a vacuum. Both times, apparently, the precursors preceded the photons' main bodies, and the precursor traveled at ''c'' in a vacuum. According to Du, this implies that there is no possibility of light traveling faster than ''c'' (and, thus, violating causality).〔http://www.ust.hk/eng/news/press_20110719-893.html〕 Some members of the media took this as an indication of proof that time travel to the past using superluminal speeds was impossible.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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