The National Institute of Information and Communications Technology has succeeded in generating national standard time for the first time in the world by referring to an optical lattice clock that operates intermittently by repeatedly starting and stopping the machine.By adjusting the length of 1 second that the standard time ticks based on the 1 second that the optical grid clock generates, the time difference from the conventional agreed world time of the standard time is within 10 billionths of a second from the conventional 20 times 10 billion seconds. It becomes possible to shorten to.
According to the Information and Communication Research Organization, the optical lattice clock is an optical clock system proposed by Associate Professor Hidetoshi Katori (at that time) of the Graduate School of Engineering, the University of Tokyo in 2001.Currently, the strontium or ytterbium optical lattice clocks developed by six organizations including the mechanism are internationally recognized as secondary frequency standards and have the ability to calibrate the 6 second ticked by Coordinated Universal Time (UTC).The strontium optical lattice clock developed by the same mechanism produces stable light and is characterized by extremely low frequency uncertainty.This light can be converted into a microwave electric signal without degrading the accuracy, and it is possible to accurately measure how much the step size in Japan Standard Time deviates from the microwave output frequency in Japan Standard Time.
In recent years, there have been an increasing number of fields that require time accuracy in the nanosecond region beyond microseconds, such as 5th generation mobile communication systems (5G), satellite positioning, and ultra-high-speed transactions.The standard time of each country refers to the universal time, and is generated in synchronization with a time difference (plus 9 hours in Japan).
The results of this research will greatly contribute to more accurate standard time generation, and will also be of great help in realizing the redefinition of seconds in the International System of Units envisioned in 2030.
