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Chief Scientist Laboratories Quantum Metrology Laboratory

Chief Scientist: Hidetoshi Katori (D.Eng.)

Research Summary

Hidetoshi  Katori(D.Eng.)

The quest for the superb precision of atomic spectroscopy contributed to the birth of the quantum-mechanics and to progress of modern physics. Highly precise atomic clocks, which are the outcomes of such research, are indeed the key technologies that support our modern society, such as the navigation with GPS and synchronization of high-speed communication networks. In 2001, we proposed a new atomic clock scheme, "optical lattice clock," which may allow us accessing to 18-digit-precision time/frequency in a measurement time of seconds. Armed with such high precision atomic clocks, we investigate fundamental physics such as the constancy of fundamental constants, whose coupling to the gravity, as well as application of such clocks to relativistic geodesy. In parallel, we explore quantum information technology and quantum metrology using "optical lattice clocks" as platforms to investigate the quantum feedback scheme and quantum simulator/computation.

Main Research Fields

  • Engineering

Related Research Fields

  • Interdisciplinary Science & Engineering


  • Quantum electronics
  • Atomic clock
  • Quantum metrology
  • Optical lattice clock
  • Relativistic geodesy

Selected Publications

  • 1. Takamoto, T., Ushijima, I., Ohmae, N., Yahagi, T., Kokado, K., Shinkai., H, and Katori, H.:
    "Test of general relativity by a pair of transportable optical lattice clocks"
    Nat. Photon. 14, 411 (2020).
  • 2. Yamaguchi, A., Safronova, M. S., Gibble, K., and Katori, H.:
    "Narrow-line Cooling and Determination of Magic Wavelength of Cd"
    Phys. Rev. Lett. 123, 113201 (2019).
  • 3. Okaba, S., Yu, D., Vincetti, L., Benabid, F., and Katori, H.:
    "Superradiance from lattice-confined atoms inside hollow core fibre"
    Commun. Physics 2, 136 (2019).
  • 4. Yamaguchi, A., Muramatsu, H., Hayashi, T., Yuasa, N., Nakamura, K., Takimoto, M., Haba, H., Konashi, K., Watanabe, M., Kikunaga, H., Maehata, K., Yamasaki, N. Y., and Mitsuda, K.:
    "Energy of the 229Th Nuclear Clock Isomer Determined by Absolute γ-ray Energy Difference"
    Phys. Rev. Lett. 123, 222501 (2019).
  • 5. Ushijima, I., Takamoto, M., and Katori, H.:
    "Operational Magic Intensity for Sr Optical Lattice Clocks"
    Phys. Rev. Lett. 121, 263202 (2018).
  • 6. Katori, H.:
    "Tricks for ticks"
    Nat. Phys. 13, 414 (2017).
  • 7. Takano, T., Takamoto, M., Ushijima, I., Ohmae, N., Akatsuka, T., Yamaguchi, A., Kuroishi, Y., Munekane, H., Miyahara, B., and Katori, H.:
    "Geopotential measurements with synchronously linked optical lattice clocks"
    Nat. Photon. 10, 662 (2016).
  • 8. Nemitz, N., Ohkubo, T., Takamoto, M., Ushijima, I., Das, M., Ohmae, N., and Katori, H.:
    "Frequency ratio of Yb and Sr clocks with 5×10 -17 uncertainty at 150 seconds averaging time"
    Nat. Photon. 10, 258 (2016).
  • 9. Yamanaka, K., Ohmae, N., Ushijima, I., Takamoto, M., and Katori, H.:
    "Frequency Ratio of 199Hg and 87Sr Optical Lattice Clocks beyond the SI Limit"
    Phys. Rev. Lett. 114, 230801 (2015).
  • 10. Ushijima, I., Takamoto, M., Das, M., Ohkubo, T., and Katori, H.:
    "Cryogenic optical lattice clocks"
    Nat. Photon. 9, 185 (2015).

Recent Research Results

Annual research report

Related Links

Lab Members

Principal investigator

Hidetoshi Katori
Chief Scientist

Core members

Masao Takamoto
Senior Research Scientist
Atsushi Yamaguchi
Research Scientist
Ichiro Ushijima
Visiting Scientist
Tetsushi Takano
Visiting Scientist
Tomoya Akatsuka
Visiting Scientist
Nils Nemitz
Visiting Scientist
Hiromitsu Imai
Visiting Scientist
Katsuya Oguri
Visiting Scientist
Fujio Shimizu
Research Consultant

Contact Information

2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Email: hkatori [at] riken.jp