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 computation and communication. We exploit state-of-the-art nanofabrication technologies to develop and engineer photonic and optoelectronic devices that would allow for manipulation of quantum states, with focus on devices that utilize individual single-walled carbon nanotubes. We are also interested in demonstrating optical devices with novel functionalities that can only be achieved at the nanoscale. By combining microspectroscopy with electronic techniques, we investigate the physics underlying the operation of these devices.

Main Research Field

Interdisciplinary science and engineering

Related Research Fields

Mathematical and physical sciences / Chemistry / Engineering

Research Subjects

  • Optical properties and exciton physics of individual carbon nanotubes
  • Single-carbon-nanotube photonics and optoelectronics
  • Integration of carbon nanotube emitters into silicon photonic structures

Selected Publications

Papers with an asterisk(*) are based on research conducted outside of RIKEN.
  1. *M. Yoshida, A. Popert, Y. K. Kato:
    "Gate-voltage induced trions in suspended carbon nanotubes"
    Phys. Rev. B 93, 041402(R) (2016).
  2. *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).
  3. *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).
  4. *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).
  5. *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).
  6. *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).
  7. *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).
  8. *Y. K. Kato, R. C. Myers, A. C. Gossard, D. D. Awschalom:
    "Observation of the spin Hall effect in semiconductors"
    Science 306, 1910 (2004).
  9. *Y. Kato, R. C. Myers, A. C. Gossard, D. D. Awschalom:
    "Coherent spin manipulation without magnetic fields in strained semiconductors"
    Nature 427, 50 (2004).
  10. *Y. Kato, R. C. Myers, D. C. Driscoll, A. C. Gossard, J. Levy, D. D. Awschalom:
    "Gigahertz electron spin manipulation using voltage-controlled g-tensor modulation"
    Science 299, 1201 (2003).

Lab Members

Principal Investigator

Yuichiro Kato
Chief Scientist

Core Members

Masahiro Yoshida
Technical Staff II
Akihiro Sasabe
Student Trainee
Takushi Uda
Student Trainee
Akihiro Ishii
Student Trainee
Issei Kimura
Student Trainee
Hidenori Machiya
Student Trainee

Contact information

420 Main Research Building,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan

Email: yuichiro.kato [at]

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