光晶格鐘:160億年內偏差１秒, 東京大學團隊製成

A few weeks ago the Mainichi News on-line reported the following:

光格子時計:１秒ずれるのに１６０億年　東大チームが作製

毎日新聞　2015年02月10日　01時30分

　時間の「秒」を定義しているセシウム原子時計よりも精度が１００倍以上高い「光格子時計」を２台作って作動させたところ、２台のずれが１６０億年で１秒という超高精度になったと、香取秀俊東京大教授（量子エレクトロニクス）らのチームが発表した。１３８億年前に宇宙が誕生してから現在まで計り続けたとしても、ずれが１秒より小さいことになる。

　これまでの光格子時計の世界最高記録を約３０倍上回る。成果は、９日付の科学誌ネイチャーフォトニクス電子版に発表した。

　２台を光ケーブルでつないで約１カ月間動かして計算したところ、２台が１秒ずれるのに１６０億年かかるという結果になった。（共同）

(試譯文)

   A team formed by professor Hidetoshi Katori (Quantum electronics) of the University of Tokyo and others announced that they made and operated two "Optical lattice clock" that was 100 times more precise than the cesium nuclear clock which defined one "second" in time; the two had super-high precision with deviation of one second in every 16,000 million years. Even if it kept on measuring after the universe was born 13,800 million years ago, up to now the deviation would be less than 1 second.

  

   They exceeded the existing world record in Optical lattice clock by about 30 times. This outcome was announced to a science magazine the Nature Photonics electronic edition dated the 9^th (February).

   

   When the two were connected to the optical fiber cable, its movement in about one month was calculated. The result was that both took 16,000 million years to deviate 1 second.

Obviously it is a great achievement in science.