China's optical clock technology achieves a breakthrough with an error of less than 1 second over 30 billion years

A team led by Jian-Wei Pan at the University of Science and Technology of China has made major progress in the development of optical clocks. The stability and uncertainty of the strontium atomic optical lattice clock both have surpassed the 10^{-19} level; the error will not exceed 1 second within 30 billion years, meeting the requirements for the redefinition of the second in the International System of Units. This achievement marks that China has reached an internationally leading level in the field of precise time measurement. The related results were published on March 5 in the international metrology journal 《Metrology》. (CCTV News)