Is there a standard for clock accuracy? Apparently, it is too early to talk about this, but scientists in many countries of the world are striving for this. The All-Russian Research Institute of Physical, Technical and Radio Engineering Measurements (VNIIFTRI) has created an optical clock based on cold atoms.
According to the head of Rosstandart, Alexei Abramov, at the moment a cesium standard is used to determine the time (the cesium-133 atom is a standard for measuring time and frequency). The error of the atomic clock does not exceed 1 sec. over 100 million years.
The Russian development has exceeded this "world record": clocks on cold atoms fail for a second for several billion years. Translated into the "language" of navigation, this means that the accuracy of determining the coordinates of an object is measured in several centimeters.
In the coming months, optical watches will have to verify the optical standards. If successful, Russian scientists have a chance to become leaders in the “race” for accuracy. It is worth noting that an optical clock based on cold atoms is sensitive to changes in the Earth's gravitational field, which will help predict volcanic eruptions and accurately determine the height above sea level.