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NHK News 7 reported on Prof. Katori and his group’s research planning of gravitational potential measurement with their optical lattice clock at Tokyo Sky Tree.


Prof. Katori was awarded "The 14th Leo Esaki Prize" for "Invention and realization of high-precision optical lattice clocks".


PRESS: “Geopotential measurements with synchronously linked optical lattice clocks” published in Nature Photonics


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International workshop report "View From…Challenges in Precision Science, A never-ending quest " was published in Nature Photonics, April 2016


PRESS: "Accelerating comparisons of ytterbium and strontium optical lattice clocks: Swift, ultra-precise measurements of frequency ratios may open new windows for science"

"Frequency Ratio of Yb and Sr clocks with 5×10-17 uncertainty at 150 seconds averaging time", Nat. Photon. (2016)

To Media reports


Prof. Katoriwas awarded "JSAP Outstanding Achievement Award" for "Pioneering research on optical lattice clocks"


Research achievement, “Just a second… A mercury-atom-based clock has an accuracy surpassing that of the standard definition of the second” was published in “RIKEN RESEARCH”.


PRESS: “Highly-precise comparison of Hg and Sr optical lattice clocks”

“Frequency Ratio of 199Hg and 87Sr Optical Lattice Clocks beyond the SI Limit”, Phys. Phys. Rev. Lett. 114,230801 (2015)

To Media reports


Dr. Takamoto (Research Scientist, RIKEN) was awarded “The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology (MEXT), Prize for The Young Scientists’ Prize”.


Prof. Katori was awarded “Japan Academy Prize” for ”Invention of the Optical Lattice Clock and its development“.


PRESS: ”Development of highly-precise optical lattice clocks successfully ? a step towards future time standard”

“Cryogenic optical lattice clocks” Nat. Photon., Vol.9, 185-189 (2015)
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Main Research

(1)Development of highly accurate/-precise frequency standard using optical lattice clocks.

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(2)Coherent atom control by atom-chip and/or atom IC

(3)Generation of Quantum entanglement by cooled atom

On research (1), we aim to achieve clock precision at 18-digit, and examine the constancy and time-fluctuation of physical constants based on our original idea of "Optical Lattice Clock". Research (2) and (3) aim to substitute conventional electronics with quantum electronics for creating new information processing systems, and we are carrying out research to realize quantum computer.

Right image: Strontium atom cluster cooled and captured by magneto-optical trap.
Fluorescence from ten-million atoms cooled down to mili-Kelvin temperature can be seen at the centerof the image.


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