上百亿年不差一秒！光钟校准国际标准时间获重大突破

Core Viewpoint - The NIM-Sr1 strontium atomic optical lattice clock developed by the China National Institute of Metrology has officially been approved to calibrate International Standard Time, marking a significant milestone in China's optical clock research and enhancing its influence in the international time frequency research field [1][2]. Group 1: Technological Advancements - The NIM-Sr1 clock can achieve precision of up to tens of billions to hundreds of billions of years without error, which is a substantial improvement over the cesium atomic clocks that are accurate to only a few hundred million years [1]. - The successful calibration of the NIM-Sr1 clock signifies a transition from "single-core traction" to "three-engine drive" in China's time frequency standard research, indicating a leap in technological capabilities [2]. Group 2: International Standing - The approval of the NIM-Sr1 clock positions China among the top tier globally in the field of international time frequency standards, reflecting its leadership in this critical area of research [2]. - The calibration data released by the International Bureau of Weights and Measures confirms that the NIM-Sr1 clock passed rigorous evaluations by experts, further solidifying China's standing in the international metrology community [2].