Our country's optical clock technology has achieved a significant breakthrough - an error of less than 1 second in 3 billion years.

Journalists learned from the University of Science and Technology of China that recently, researchers Pan Jianwei, Dai Hannin, Chen Yua, Peng Chengzhi and others have made milestone progress in the development of optical clocks. They have successfully surpassed the stability and uncertainty indicators of the strontium atomic optical lattice clock by more than 10^-19, equivalent to an error of less than 1 second in about 30 billion years, making it one of the high-precision optical clocks that meet the requirements for the redefinition of the second in the international unit system. This achievement also signifies that China's research level in the field of precise time measurement has reached the forefront internationally. The related results were published in the international metrology journal "Metrology" on March 5th.