Research Institute of Electrical Communication Tohoku University


Keiichi Edamatsu,Professor

Yasuyoshi Mitsumori,Associate Professor

Mark Paul Sadgrove,Associate Professor

Nobuyuki Matsumoto,Assistant Professor

Naofumi Abe,Assistant Professor

(left)M.Sadgrove Y.Mitsumori K.Edamatsu N.Matsumoto N.Abe


Research Activities

Current information and communication technology utilizes macroscopic and classical physical quantities, such as voltage or frequency of electric fields. The classical technology will reach the limit of information density and speed in the near future. The quantum-mechanical counterpart, “quantum information processing and communication technology”, in which information is carried by microscopic and quantum-mechanical quantities, is expected to overcome the difficulty. Our goal is to develop the quantum information devices utilizing quantum interaction between electrons and photons in semiconductor nanostructures, to obtain further understanding of their physics, and to apply them to practical quantum information technologies.

Laboratory Web Page

ECEI Web Page

Quantum-Optical Information Technology(Prof. Edamatsu)

Development of fundamental devices and quantum measurement techniques for quantum info-communication technology (QICT) utilizing photons, novel materials and semiconductor nanostructures.

Research topics

  • Novel techniques for the generation and detection of photon entanglement.
  • QICT devices using optical fibers, waveguides, and semiconductor nanostructures.
  • Techniques for extreme quantum measurement and quantum state synthesis using photons.

Quantum Laser Spectroscopy(Assoc. Prof. Mitsumori)

Development of optical manipulation technique of electrons in semiconductor quantum structures for the realization of QICT

Research topics

  • Coherent optical control of electrons in semi-conductor quantum dots.
  • Quantum optics of semiconductor microcavities.

Quantum Nanophotonics(Assoc. Prof. Sadgrove)

Development of nanophotonic methods for the manipulation of quantum emitters and cold atoms.

Research topics

  • Use of optical nanofibers to produce novel single photon sources.
  • Control of cold atoms using nanophotonic devices.

Fig. 1 Experimental results (filled circles) and predicted lower bounds (curves) of error-disturbance uncertainty relations (EDR) in photon polarization measurement. The Heisenberg EDR (blue) is violated by the experiment while the EDRs proposed by Ozawa (red) and Branciard (purple and green) hold.
Fig. 2 Coherent optical control of an electron-hole pair in a semiconductor quantum dot.