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Chief Scientist Laboratories

# Quantum Metrology Laboratory

Chief Scientist: 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 Field

Engineering

## Related Research Fields

Physics

## Research Subjects

- Development of optical lattice clocks with superb precision
- Investigation of the constancy of fundamental constants using atomic clocks
- Quantum information technology based on ultracold neutral atoms

## Selected Publications

Papers with an asterisk(*) are based on research conducted outside of RIKEN.- Yamanaka, K., Ohmae, N., Ushijima, I., Takamoto, M., and Katori, H.:

"Frequency Ratio of^{199}Hg and^{87}Sr Optical Lattice Clocks beyond the SI Limit"

Physical Review Letters 114, 230801 (2015) - Katori, H., Ovsiannikov, V. D., Marmo, S. I., and Palchikov, V. G.:

"Strategies for reducing the light shift in atomic clocks"

Physical Review A 91, 052503 (2015) - Ushijima, I., Takamoto, M., Das, M., Ohkubo, T., and Katori, H.:

"Cryogenic optical lattice clocks"

Nature Photonics 9, 185-189 (2015) - *Takamoto, M., Takano, T., and Katori, H.:

"Frequency comparison of optical lattice clocks beyond the Dick limit"

Nature Photonics 5, 288-292 (2011) - *Katori, H.:

"Optical lattice clocks and quantum metrology"

Nature Photonics 5, 203-210 (2011) - *Katori, H., Hashiguchi, K., Il'inova, E.Y., and Ovsiannikov, V.D.:

"Magic Wavelength to Make Optical Lattice Clocks Insensitive to Atomic Motion"

Physical Review Letters 103, 153004 (2009) - *Akatsuka, T., Takamoto, M., and Katori, H.:

"Optical lattice clocks with non-interacting bosons and fermions"

Nature Physics 4, 954-959 (2008) - *Hachisu, H., Miyagishi, K., Porsev, S.G., Derevianko, A., Ovsiannikov, V.D., Pal'chikov, V.G., Takamoto, M., and Katori, H.:

"Trapping of Neutral Mercury Atoms and Prospects for Optical Lattice Clocks"

Physical Review Letters 100, 053001 (2008) - *Takamoto, M., Hong, F.L., Higashi, R., and Katori, H.:

"An optical lattice clock"

Nature 435, 321-324 (2005) - *Katori, H., Takamoto, M., Pal'chikov, V.G., & Ovsiannikov, V.D.:

"Ultrastable optical clock with neutral atoms in an engineered light shift trap"

Phys. Rev. Lett. 91, 173005 (2003)

## Lab Members

### Principal Investigator

- Hidetoshi Katori
- Chief Scientist

### Core Members

- Masao Takamoto
- Research Scientist
- Atsushi Yamaguchi
- Research Scientist
- Nils Nemitz
- Foreign Postdoctoral Researcher
- Ichiro Ushijima
- Postdoctoral Researcher
- Manoj Das
- Postdoctoral Researcher
- Tomoya Akatsuka
- Postdoctoral Researcher