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About RIEC Introduction Message from the Director Principles, Missions, Objectives Institute Vision Organization People, Land and Buildings, Budgets History Chronology International Activities COE of International Research Collaboration How to study at RIEC Organization Computing System Platforms Division Solid State Electronics Dielectric Nano-Devices Materials Functionality Design Spintronics Nano-Integration Devices and Systems Quantum Devices Innovative Spintronic Device Computing Information Theory New Paradigm VLSI System Information Communication Platforms Division Ultrahigh-Speed Optical Communication Group Applied Quantum Optics Group Advanced Wireless Information Technology Information Storage Systems Ultra-Broadband Signal Processing Quantum-Optical Information Technology Network Architecture Environmentally Conscious Secure Information System Human and Bio Information Systems Division Electromagnetic Bioinformation Engineering Advanced Acoustic Information Systems Visual Cognition and Systems Realｰworld computing Nano-Bio Hybrid Molecular Devices Interactive Content Design Soft Computing Integrated System Research Facilities Laboratory for Nanoelectronics and Spintronics Laboratory for Brainware Systems Research Center for 21st Century Information Technology（IT-21 Center） Common Research Facilities Flexible Information System Center Fundamental Technology Center Management Office for Safety and Health Promotion Office Ad-hoc research groups Co-creation Research Center Furukawa Electric x Tohoku Univ. Co-creation Research Center for Photonics Integration Staff Cooperative Research About RIEC Cooperative Research Projects Public Invitation RIEC Nation-wide Application System List of Research Projects Description of acknowledgment RIEC Annual Meeting FY2023 RIEC Annual Meeting FY2022 RIEC Annual Meeting International Exchange International Activities COE of International Research Collaboration Information What’s New Award News Press Release Event RIEC Annual Meeting Projects Type-T (Study Groups on Electrical Communication) Lecture Symposiums Nation-wide Cooperative Study Group Archives RIEC NEWS WEB Latest version of the Archives RIEC, Tohoku University : Back number Annual Report of RIEC : Back Number RIEC NEWS Back Number Other Call For Proposals RIEC Administrative Office (Japanese Website) Educational Activities 日本語 English About RIEC Introduction Message from the Director Principles, Missions, Objectives Institute Vision Organization People, Land and Buildings, Budgets History Chronology International Activities COE of International Research Collaboration How to study at RIEC Organization Computing System Platforms Division Solid State Electronics Dielectric Nano-Devices Materials Functionality Design Spintronics Nano-Integration Devices and Systems Quantum Devices Innovative Spintronic Device Computing Information Theory New Paradigm VLSI System Information Communication Platforms Division Ultrahigh-Speed Optical Communication Group Applied Quantum Optics Group Advanced Wireless Information Technology Information Storage Systems Ultra-Broadband Signal Processing Quantum-Optical Information Technology Network Architecture Environmentally Conscious Secure Information System Human and Bio Information Systems Division Electromagnetic Bioinformation Engineering Advanced Acoustic Information Systems Visual Cognition and Systems Realｰworld computing Nano-Bio Hybrid Molecular Devices Interactive Content Design Soft Computing Integrated System Research Facilities Laboratory for Nanoelectronics and Spintronics Laboratory for Brainware Systems Research Center for 21st Century Information Technology（IT-21 Center） Common Research Facilities Flexible Information System Center Fundamental Technology Center Management Office for Safety and Health Promotion Office Ad-hoc research groups Co-creation Research Center Furukawa Electric x Tohoku Univ. Co-creation Research Center for Photonics Integration Staff Cooperative Research About RIEC Cooperative Research Projects Public Invitation RIEC Nation-wide Application System List of Research Projects Description of acknowledgment RIEC Annual Meeting FY2023 RIEC Annual Meeting FY2022 RIEC Annual Meeting International Exchange International Activities COE of International Research Collaboration Information What’s New Award News Press Release Event RIEC Annual Meeting Projects Type-T (Study Groups on Electrical Communication) Lecture Symposiums Nation-wide Cooperative Study Group Archives RIEC NEWS WEB Latest version of the Archives RIEC, Tohoku University : Back number Annual Report of RIEC : Back Number RIEC NEWS Back Number Other Call For Proposals RIEC Administrative Office (Japanese Website) Educational Activities 日本語 English Quantum-Optical Information Technology HOME > Research Activities > Information Communication Platforms Division > Quantum-Optical Information Technology &＃62;&＃62; Information Communication Platforms Division Quantum-Optical Information Technology Researcher [ Professor ]Keiichi Edamatsu [ 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. 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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