2020: A research group of University of Tokyo at Department of Applied Physics, RIKEN(Institute of Physical and Chemical Research) and OIT at Faculty of Information Science and Technology succeeded in developing an innovative “Transportable Optical lattice clock(OLC) with Ultra-precise measurements(10 to the power of minus 18)“ for the first time in the world through a verification testing on validity of Albert Einstein's general theory of relativity at Tokyo Skytree. Compared to conventional space experiments, using the transportable OLC on satellite and rocket, the equivalent experiments are available with a height difference of 10,000 times less.
