Centers & Labs

Chief Scientist Laboratories

Nanoscale Quantum Photonics Laboratory

Chief Scientist: Yuichiro Kato (Ph.D.)
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 Field

Interdisciplinary science and engineering

Related Research Fields

Mathematical and 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. N. Higashide, M. Yoshida, T. Uda, A. Ishii, Y. K. Kato,
    "Cold exciton electroluminescence from air-suspended carbon nanotube split-gate devices"
    Appl. Phys. Lett. 110, 191101 (2017).
  2. *M. Yoshida, A. Popert, Y. K. Kato,
    "Gate-voltage induced trions in suspended carbon nanotubes"
    Phys. Rev. B 93, 041402(R) (2016).
  3. *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).
  4. *X. Liu, T. Shimada, R. Miura, S. Iwamoto, Y. Arakawa, Y. K. Kato,
    "Localized guided-mode and cavity-mode double resonance in photonic crystal nanocavities"
    Phys. Rev. Applied 3, 014006 (2015).
  5. *R. Miura, S. Imamura, R. Ohta, A. Ishii, X. Liu, T. Shimada, S. Iwamoto, Y. Arakawa, Y. K. Kato,
    "Ultralow mode-volume photonic crystal nanobeam cavities for high-efficiency coupling to individual carbon nanotube emitters"
    Nature Commun. 5, 5580 (2014).
  6. *Y. Kumamoto, M. Yoshida, A. Ishii, A. Yokoyama, T. Shimada, Y. K. Kato,
    "Spontaneous exciton dissociation in carbon nanotubes"
    Phys. Rev. Lett. 112, 117401 (2014).
  7. *A. Yokoyama, M. Yoshida, A. Ishii, Y. K. Kato,
    "Giant circular dichroism in individual carbon nanotubes induced by extrinsic chirality"
    Phys. Rev. X 4, 011005 (2014).
  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).

Lab Members

Principal Investigator

Yuichiro Kato
Chief Scientist

Core Members

Akihiro Ishii
Postdoctoral Researcher
Widianta Gomulya
Postdoctoral Researcher
Hidenori Machiya
Junior Research Associate
Takushi Uda
Student Trainee

Contact information

Room 420, Main Research Building,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Tel: +81-(0)48-462-1449

Email: contactkatogroup [at]

Related links

Annual research report