By showing a single photon cannot travel faster than the speed of light, scientists prove time travel is impossible.
2011年7月24日 下午 11:12:38
Translation by Autumnson Blog
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•Hone Kong physicists say they have proven a single photon cannot travel faster than the speed of light.
•香港物理學家說，他們已證明單一的光子不能以超光速旅行。
•This demonstrates that time travel is impossible, they say.
•這表明時間旅行是不可能的，他們說。
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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.
香港的物理學家說，他們已證明單一的光子遵循愛因斯坦的理論，沒有什麼東西可以超光速旅行 -- 在科幻小說以外示範，時間旅行是不可能的。
The Hong Kong University of Science and Technology research team led by Du Shengwang said they had proved that a single photon, or unit of light, "obeys the traffic law of the universe."
香港科技大學研究隊領導都常旺說，他們已證明單一的光子，或光的單位，“遵循宇宙的交通法例。”
"Einstein claimed that the speed of light was the traffic law of the universe or in simple language, nothing can travel faster than light," the university said on its website.
“愛因斯坦宣稱，光速是宇宙的交通法律，或以簡單的語言，沒有什麼東西可以超速度旅行，”大學在其網站上說。
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"Professor Du's study demonstrates that a single photon, the fundamental quanta of light, also obeys the traffic law of the universe just like classical EM (electromagnetic) waves."
The possibility of time travel was raised 10 years ago when scientists discovered superluminal -- or faster-than-light -- propagation of optical pulses in some specific medium, the team said.
It was later found to be a visual effect, but researchers thought it might still be possible for a single photon to exceed light speed.
Du, however, believed Einstein was right and determined to end the debate by measuring the ultimate speed of a single photon, which had not been done before.
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"The study, which showed that single photons also obey the speed limit c, confirms Einstein's causality; that is, an effect cannot occur before its cause," the university said.
"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 Du, 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 team's study was published in the U.S. peer-reviewed scientific journal Physical Review Letters.
小組的研究結果發表在美國同行評議的科學期刊物理評論信件。
http://beforeitsnews.com/story/856/530/Time_Travel_Impossible,_Say_Scientists.html
俄羅斯科學家建造運行的時光機
科學家打破光速 - 推翻愛因斯坦1905年的狹義相對論
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