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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)

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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)

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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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See the past information

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.


To students who wish to attend the graduate school
We are recruiting motivated students who are going to join o the master's course
If you wish to pay a visit to our lab..Please contact