Press Release　April 07, 2020　Experiment @ TOKYO SKYTREE "Successful Development of a Portable Optical Lattice Clock with 18-Digit Precision for the First Time in the World"

Press release was jointly conducted by the University of Tokyo, RIKEN, GSI, Shimadzu Corporation, Tobu Tower Skytree Corporation and JST.
"Successful Development of a Portable Optical Lattice Clock with 18-Digit Precision for the First Time in the World"
～Verification of general relativity at Tokyo Skytree～

• Press Release by UTOKYO

【Overview】
The world's first successful development of two portable optical lattice clocks with 18-digit accuracy. Using these two optical lattice clocks, we performed high-precision observations of gravitational redshift above and below the The Tokyo Skytree, and successfully verified general relativity on the ground.

【Paper】
Masao Takamoto, Ichiro Ushijima, Noriaki Ohmae, Toshihiro Yahagi, Kensuke Kokado, Hisaaki Shinkai & Hidetoshi Katori, Test of General Relativity by a Pair of Transportable Optical Lattice Clocks, Nature Photonics (2020).