Atomic clocks reached a record-breaking uncertainty of less than 10−18 and the time needed to compare clocks is now less than an hour. These results push towards a possible redefinition of the second from a microwave to an optical standard. Atomic clocks reached a record-breaking uncertainty of less than 10−18 and the time needed to compare clocks is now less than an hour. These results push towards a possible redefinition of the second from a microwave to an optical standard.

中文翻译：

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准确稳定的计时

原子钟达到了创纪录的不确定性，小于10-18，而比较时钟所需的时间现在不到一个小时。这些结果促使人们可能将秒的定义从微波重新定义为光学标准。原子钟达到了创纪录的不确定性，小于10-18，而比较时钟所需的时间现在不到一个小时。这些结果促使人们可能将秒的定义从微波重新定义为光学标准。