Watch crazy not only about one second in 13.7 billion years.

A day, National Institute of Advanced Industrial Science and Technology has announced a candidate for the next generation of world standard clock that determines the length of the second one is the basic unit of time, and was chosen "ytterbium optical lattice clock" in the development.
Candidate from Japan in the second type, it was decided by the International Committee of Weights and Measures to determine the international standard unit of measurement that was held in Paris.
Currently, standard clock has decided on the basis of one second vibration of cesium atoms, there was an error of one second in 80 million years. Count the vibration on that you do not get stuck in the laser beam, the ytterbium atom, being developed by the Institute clock determines the second. Theoretically, the error is that about one second from now to the year of birth of the universe 13.7 billion. According to the Dean of the institute Hiroshi, a candidate for standard clock is now three and eight and watches of the institute has been newly added. That determine the final over the years to 10 years.
  It is amazing the error of one second in 13.7 billion years. It is not that crazy little clock. There was talk of neutrinos faster than the speed of light, as the unit of time is used as a reference, I guess are asked about the accuracy of this.




産業技術総合研究所は１日、時間の基本単位である１秒の長さを決める次世代の世界標準時計の候補に、開発中の「イッテルビウム光格子時計」が選ばれたと発表した。
　日本発の候補は２種類目で、パリで開かれた計測単位の国際標準を決める国際度量衡委員会で決まった。
　標準時計は現在、セシウム原子の振動を基に１秒を決めているが、８０００万年間で１秒の誤差があった。同研究所が開発中の時計は、イッテルビウム原子を、レーザー光で動けないようにした上で振動を数えて、１秒を決める。誤差は理論上、宇宙誕生から今までの１３７億年間で１秒程度という。　同研究所の洪・研究科長によると、標準時計の候補は、今回同研究所の時計など３種類が追加されて８種類となった。数年～１０年間かけて最終的に決まるという。
 137億年で1秒の誤差とは凄いですね。ほとんど狂うことがない時計ですね。光速より速いニュートリノの話題がありましたが、基準となる時間の単位としては、これぐらいの精度が求められるんでしょうね。