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Chief Scientist Laboratories Nanoscale Quantum Photonics Laboratory

Chief Scientist: Yuichiro Kato (Ph.D.)

Research Summary

Yuichiro  Kato(Ph.D.)

Control over the quantum nature of photons at the nanoscale opens up unique opportunities in quantum information processing. We study the physics underlying the operation of nanoscale photonic devices to explore new approaches for manipulating quantum states, with focus on devices that make use of individual single-walled carbon nanotubes. By combining microspectroscopy with electronic techniques, we investigate unconventional methods for manipulating the optical properties of nanomaterials within device structures, which should form the basis for future quantum technologies employing integrated quantum photonic circuits.

Main Research Fields

  • Interdisciplinary Science & Engineering

Related Research Fields

  • Mathematical & Physical Sciences
  • Chemistry
  • Engineering
  • nanostrucutre physics
  • condensed matter physics I
  • optical engineering, photon science


  • optical properties
  • nanoscale physics
  • device physics
  • carbon nanotubes
  • photonic crystals

Selected Publications

Papers with an asterisk(*) are based on research conducted outside of RIKEN.

  • 1.K. Otsuka, A. Ishii, Y. K. Kato.:
    "Super-resolution fluorescence imaging of carbon nanotubes using a nonlinear excitonic process"
    Opt. Express 27, 17463 (2019).
  • 2.S. Tanaka, K. Otsuka, K. Kimura, A. Ishii, H. Imada, Y. Kim, Y. K. Kato.:
    "Organic molecular tuning of many-body interaction energies in air-suspended carbon nanotubes"
    J. Phys. Chem. C 123, 5776 (2019).
  • 3.A. Ishii, X. He, N. F. Hartmann, H. Machiya, H. Htoon, S. K. Doorn, Y. K. Kato.:
    "Enhanced single photon emission from carbon nanotube dopant states coupled to silicon microcavities"
    Nano Lett. 18, 3873 (2018).
  • 4.T. Uda, A. Ishii, Y. K. Kato.:
    "Single carbon nanotubes as ultrasmall all-optical memories"
    ACS Photonics 5, 559 (2018).
  • 5.H. Machiya, T. Uda, A. Ishii, Y. K. Kato.:
    "Spectral tuning of optical coupling between air-mode nanobeam cavities and individual carbon nanotubes"
    Appl. Phys. Lett. 112, 021101 (2018).
  • 6.A. Ishii, T. Uda, Y. K. Kato.:
    "Room-temperature single-photon emission from micrometer-long air-suspended carbon nanotubes"
    Phys. Rev. Applied 8, 054039 (2017).
  • 7.*M. Jiang, Y. Kumamoto, A. Ishii, M. Yoshida, T. Shimada, Y. K. Kato.:
    "Gate-controlled generation of optical pulse trains using individual carbon nanotubes"
    Nature Commun. 6, 6335 (2015).
  • 8.*S. Moritsubo, T. Murai, T. Shimada, Y. Murakami, S. Chiashi, S. Maruyama, Y. K. Kato.:
    "Exciton diffusion in air-suspended single-walled carbon nanotubes"
    Phys. Rev. Lett. 104, 247402 (2010).
  • 9.*Y. K. Kato, R. C. Myers, A. C. Gossard, D. D. Awschalom.:
    "Observation of the spin Hall effect in semiconductors"
    Science 306, 1910 (2004).
  • 10.*Y. Kato, R. C. Myers, A. C. Gossard, D. D. Awschalom.:
    "Coherent spin manipulation without magnetic fields in strained semiconductors"
    Nature 427, 50 (2004).

Recent Research Results

Annual research report

Related Links

Lab Members

Principal investigator

Yuichiro Kato
Chief Scientist

Core members

Wataru Terashima
Research Scientist
Akihiro Ishii
Postdoctoral Researcher
Nan Fang
Postdoctoral Researcher
Daiki Yamashita
Postdoctoral Researcher
Zhen Li
Postdoctoral Researcher
Keigo Otsuka
Visiting Researcher
Alka Sharma
Visiting Researcher
Hidenori Machiya
Student Trainee

Contact Information

Room 420, Main Research Building,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Tel: +81-(0)48-462-1449
Email: katogp-info [at] ml.riken.jp