"Optical lattice clock"

Where accuracy than cesium atomic clock that defines the "second" time was operated by creating two high "optical lattice clock" 100 times or more, ultra high as 1 second in two shift 160 million years that it became the accuracy, Katori Tokyo of large professor (quantum Electronics) from team announced. 13.8 billion years the universe continued scale since the birth until now before, so that the deviation is less than 1 second.
So far of the world's highest record of optical lattice clock I more than about 30 times. Achievement, I announced to the science journal Nature Photonics electronic version of date 9.
Two was calculated by moving about a month by connecting an optical cable, two has resulted in such 16 billion years to off by one second.
The principle of the optical lattice clock, first, a special small space of the laser beam was made and allowed to interference wave called "magic wavelength", one by one laser cooled atoms were captured, the interaction of each other atoms occurs so that you do not. Then, applying a laser light to these atoms, I frequency of the light that is absorbed (resonance frequency) to precisely measure. By counting the vibration of the light, to determine the length of a second. The principle, It is well to understand not, but can not be considered accurate.



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。
　光格子時計の原理は、まず、「魔法波長」と呼ばれる特別な波長のレーザー光を干渉させて作った微小空間に、レーザー冷却された原子を１つずつ捕獲し、原子どうしの相互作用が起きないようにします。次に、これらの原子にレーザー光を当て、吸収する光の振動数（共鳴周波数）を精密に測定します。この光の振動を数えて、１秒の長さを決めます。原理については、よく分かりませんが考えられない精度ですね。