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Quantum-Optical Information Technology

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Quantum-Optical Information Technology

Researcher

  • [ Professor ]
    Keiichi Edamatsu
  • [ Associate Professor]
    Fumihiro Kaneda
  • [ Assistant Professor ]
    Soyoung Baek

Group Web Site

http://www.quantum.riec.tohoku.ac.jp/

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 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.

Quantum-Optical Information Systems(Prof. Edamatsu)

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.

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

Fig.1 Schematic picture of unpolarized single-photon generation using a compound defect, a nitrogen vacancy center (NV center), in a diamond. Spheres, designated N and V respectively, indicate a nitrogen atom and a vacancy which comprises an NV center in the diamond lattice. Dynamically and statically unpolarized single-photon emission is induced by laser excitation for a [111]-oriented NV center in (111) diamond.

Quantum-Optical Information Devices(Assoc. Prof. Kaneda)

Research topics

  • Development of quantum-optical devices including quantum-light emitters and quantum gates
  • Development of new technologies utilizing quantum states of light

Development of quantum and nonlinear optical devices toward large-scale quantum information and measurement applications.

Fig.2 An illustration of the scheme for producing frequency-entangled photons. A nonlinear crystal has two different poling periods so that produced photon pairs with orthogonally polarized photon pairs can be frequency entangled.

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