Large-scale Type


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Technology theme: Ultrahigh precision time measurement technologies leading to a new time-business

Technologies for the accurate measurement of time have been sought after and evolved in the long history of mankind. The unit, "time," is a basis for all physical phenomena. It has been used in every academic and industrial sector and incorporated into technologies supporting the base of present civilized society, such as providing global positioning information and large-scale communications. In recent years, research has advanced to improve time measurement by two to three digits in precision to super-precise time measurement. The synchronization of super-precise time measurement and a communications system or information instrument is expected to improve the advanced technologies for utilizing time, including communications and information technologies.

<Adopted in FY2018> R&D Project TitleSummaryR&D Period
Space-time information platform with a cloud of optical lattice clocks
KATORI Hidetoshiexlink
Space-time information platform with a cloud of optical lattice clocks

R&D Management Committee Members

URABE Shinji Professor Emeritus, Osaka University
SASASE Iwao Professor Emeritus, Keio University
HIROKAWA Rui Chief Engineer, Kamakura Works, Mitsubishi Electric Corporation
MORINAGA Atsuo Professor Emeritus, Tokyo University of Science

Space-time information platform with a cloud of optical lattice clocks


The optical lattice clock, taken as a ridiculous idea in 2001, has come true and changed the game for building highly precise and stable atomic clocks. In this project, we will develop a space-time information platform by networking "optical lattice clocks", which improve the uncertainty of atomic clocks used in GNSS (Global Navigation Satellite System) by three orders of magnitude. Such a platform will benefit future high-capacity network systems, navigation, and other services.

Since the dawn of history, mankind has elaborated technologies for timekeeping and developed applications to fully use time resources. These technologies have triggered a paradigm-shift in communication and information technologies. In order to facilitate a new breakthrough in industrial and academic fields introduced by highly-precise clocks, we will develop transportable and compact "optical lattice clocks" that allow remote maintenance and unattended operation.

By networking them via phase-stabilized fibers,
we will demonstrate clocks' application to relativistic geodesy and establish a space-time information platform that will substitute GNSS.


R&D Team

[Leading Institution]
The University of Tokyo, RIKEN,

The University of Tokyo, RIKEN, NTT LTD., Shimadzu CO., JEOL Ltd., NICT, AIST, SIGMAKOKI, The University of Electro-Communications, Fukuoka University, JAXA, AISIN CORPORATION, NAOJ, GSI, astamuse company,Ltd.

Project Website

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