Tomohiro Otsuka

J-GLOBAL         Last updated: Jun 22, 2018 at 18:35
 
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Name
Tomohiro Otsuka
E-mail
tomohiro.otsukariec.tohoku.ac.jp
URL
http://en.tomootsuka.net/
Affiliation
Tohoku University
Section
Quantum Devices (Otsuka Group), Research Institute of Electrical Communication
Job title
Associate Professor
Degree
Doctor of Science(University of Tokyo)
Other affiliation
Department of Applied Physics, University of TokyoRIKEN (Center for Emergent Matter Science, Quantum Functional System Research Group)Department of Electrical Engineering, School of Engineering, Tohoku UniversityCenter for Spintronics Research Network, Tohoku University

Research Areas

 
 

Academic & Professional Experience

 
Apr 2018
 - 
Today
Associate Professor, Department of Electrical Engineering, School of Engineering, Tohoku University
 
Apr 2018
 - 
Today
Associate Professor, Center for Spintronics Research Network, Tohoku University
 
Feb 2018
 - 
Today
Visiting Researcher, RIKEN (Center for Emergent Matter Science, Quantum Functional System Research Group)
 
Feb 2018
 - 
Today
Associate Professor, Research Institute of Electrical Communication, Tohoku University (Quantum Devices (Otsuka Group), Information Devices Division)
 
Oct 2016
 - 
Today
Project Researcher, JST, PRESTO
 

Published Papers

 
Takashi Nakajima, Matthieu R. Delbecq, Tomohiro Otsuka, Shinichi Amaha, Jun Yoneda, Akito Noiri, Kenta Takeda, Giles Allison, Arne Ludwig, Andreas D. Wieck, Xuedong Hu, Franco Nori, Seigo Tarucha
Nature Communications   9 2133-1--8   May 2018   [Refereed]
© 2018 The Author(s). Quantum coherence of superposed states, especially of entangled states, is indispensable for many quantum technologies. However, it is vulnerable to environmental noises, posing a fundamental challenge in solid-state systems ...
Takumi Ito*, Tomohiro Otsuka*, Takashi Nakajima, Matthieu R. Delbecq, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Akito Noiri, Giles Allison, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha (*equal contribution)
   May 2018
Scaling up qubits is a necessary step to realize useful systems of quantum
computation. Here we demonstrate coherent manipulations of four individual
electron spins using a micro-magnet method in a quadruple quantum dot - the
largest number of dot...
A. Noiri, T. Nakajima, J. Yoneda, M. R. Delbecq, P. Stano, T. Otsuka, K. Takeda, S. Amaha, G. Allison, K. Kawasaki, A. Ludwig, A. D. Wieck, D. Loss, S. Tarucha
   Apr 2018
Single-spin qubits in semiconductor quantum dots proposed by Loss and
DiVincenzo (LD qubits) hold promise for universal quantum computation with
demonstrations of a high single-qubit gate fidelity above 99.9 % and two-qubit
gates in conjunction wi...
Jun Yoneda, Kenta Takeda, Tomohiro Otsuka, Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Giles Allison, Takumu Honda, Tetsuo Kodera, Shunri Oda, Yusuke Hoshi, Noritaka Usami, Kohei M. Itoh, Seigo Tarucha
Nature Nanotechnology   13 102-106   Feb 2018   [Refereed]
© 2017 The Author(s). The isolation of qubits from noise sources, such as surrounding nuclear spins and spin-electric susceptibility1-4, has enabled extensions of quantum coherence times in recent pivotal advances towards the concrete implementati...
Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Peter Stano, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha
Scientific Reports   7 12201-1--7   Sep 2017   [Refereed]
© 2017 The Author(s). Understanding the dynamics of open quantum systems is important and challenging in basic physics and applications for quantum devices and quantum computing. Semiconductor quantum dots offer a good platform to explore the phys...

Conference Activities & Talks

 
Fast Local Electronic Probes utilizing Quantum Dots for Fluctuation Measurement in Nanodevices
Tomohiro Otsuka, Shinichi Amaha, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Retsu Sugawara, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
新学術領域「ゆらぎと構造」第3回領域研究会   17 Jun 2016   
Measurement of charge states in Si/SiGe multiple quantum dots
T. Otsuka, K. Takeda, J. Yoneda, T. Honda, M. R. Delbecq, G. Allison, M. Marx, T. Nakajima, T. Kodera, S. Oda, Y. Hoshi, N. Usami, K. M. Itoh, S. Tarucha
Silicon Quantum Electronics Workshop   Jun 2016   
Multiplexed reflectometry measurement of a gate-defined Si-MOS quantum dot
J. Yoneda, T. Honda, K. Takeda, M. Marx, T. Otsuka, T. Nakajima, M. R. Delbecq, S. Amaha, G. Allison, T. Kodera, S. Oda, S. Tarucha
Silicon Quantum Electronics Workshop   Jun 2016   
AC Stark effect and optimal control of a strongly driven Si/SiGe quantum dot spin qubit
K. Takeda, J. Kamioka, J. Yoneda, T. Otsuka, M. R. Delbecq, G. Allison, T. Nakajima, T. Kodera, S. Oda, S. Tarucha
Silicon Quantum Electronics Workshop   Jun 2016   
Hybrid cQED architecture as a model system for non-equilibrium physics in condensed matter
Matthieu R. Delbecq, Giles Allison, Takashi Nakajima, Jun Yoneda, Kenta Takeda, Marian Marx, Tomohiro Otsuka, Shinich Amaha, and Seigo Tarucha
ImPACT量子情報技術ワークショップ   29 Mar 2016   

Education

 
Apr 2007
 - 
Mar 2010
Ph.D. course, Department of Physics, University of Tokyo (ISSP Katsumoto Lab)
 
Apr 2005
 - 
Mar 2007
Master course, Department of Physics, University of Tokyo (ISSP Katsumoto Lab)
 
Apr 2003
 - 
Mar 2005
Department of Physics, University of Tokyo