Keisuke Fujii

J-GLOBAL         Last updated: Oct 3, 2019 at 15:16
 
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Name
Keisuke Fujii
Affiliation
Osaka University
Section
Graduate School of Science
Degree
PhD(eng.)

Academic & Professional Experience

 
Apr 2019
 - 
Today
Professor, Graduate School of Engineering Science, Osaka University
 
Oct 2017
 - 
Mar 2019
Associate Professor, Kyoto University
 
Apr 2016
 - 
Sep 2017
Assistant Professor, Photon Science Center, The University of Tokyo
 
Apr 2015
 - 
Mar 2016
Assistant Professor, The Hakubi Center for Advanced Research/ Graduate School of Science, Kyoto University
 
Apr 2013
 - 
Mar 2015
Assistant Professor, The Hakubi Center for Advanced Research/ Graduate School of Informatics, Kyoto University
 

Published Papers

 
Nobuyuki Yoshioka, Yuya O. Nakagawa, Kosuke Mitarai, Keisuke Fujii
arXiv      Aug 2019
We propose a quantum-classical hybrid algorithm to simulate the non-equilibrium steady state of an open quantum many-body system, named the dissipative-system Variational Quantum Eigensolver (dVQE). To employ the variational optimization technique...
Ken M. Nakanishi, Keisuke Fujii, Synge Todo
   Mar 2019
We propose a sequential minimal optimization method for quantum-classical
hybrid algorithms, which converges faster, is robust against statistical error,
and is hyperparameter-free. Specifically, the optimization problem of the
parameterized quant...
K. Mitarai and K. Fujii
Physical Review Research      Aug 2019   [Refereed]
K. Mitarai, M. Kitagawa, and K. Fujii
99(1) 012301:1-012301:8   Jan 2019   [Refereed]
T. Furuta, K. Fujii, K. Nakajima, S. Tsunegi, H. Kubota, Y. Suzuki, and S. Miwa
10(3) 034063:1-034063:9   Sep 2018   [Refereed]
K. Mitarai, M. Negoro, M. Kitagawa, and K. Fujii
Physical Review A   98(3) 032309:1-032309:6   Sep 2018   [Refereed]
K. Fujii, H. Kobayashi, T. Morimae, H. Nishimura, S. Tamate, and S. Tani
Physical Review Letters   120(20) 200502:1-200502:6   May 2018   [Refereed]
K. Fukui, A. Tomita, A. Okamoto, and K. Fujii
Physical Review X   8(2) 021054:1-021054:12   May 2018   [Refereed]
K. Nakajima, K. Fujii, M. Negoro, K. Mitarai, and M. Kitagawa
1-15   2018
M. Negoro, K. Mitarai, K. Fujii, K. Nakajima, and M. Kitagawa
1-5   2018
K. M. Nakanishi, K. Mitarai, and K. Fujii
1-7   2018
K. Heya, Y. Suzuki, Y. Nakamura, and K. Fujii
1-10   2018
Y. Suzuki, K. Fujii, and M. Koashi
Physical Review Letters   119(19) 190503:1-190503:5   Nov 2017   [Refereed]
K. Fujii and M. Hayashi
Physical Review A   96(3) 030301:1R-030301:6R   Sep 2017   [Refereed]
K. Fujii and K. Nakajima
Physical Review Applied   8(2) 024030:1-024030:20   Aug 2017   [Refereed]
T. Morimae, K. Fujii, and H. Nishimura
Physical Review A   95(4) 042336:1-042336:6   Apr 2017   [Refereed]
K. Fujii and T. Morimae
New Journal of Physics   19 033003:1-033003:24   Mar 2017   [Refereed]
Y. Takeuchi, K. Fujii, R. Ikuta, T. Yamamoto, and N. Imoto
Physical Review A   93(5) 052307:1-052307:10   May 2016   [Refereed]
K. Fujii and S. Tamate
Scientific Reports   6 25598:1-25598:15   May 2016   [Refereed]
T. Morimae, K. Fujii, and H. Nishimura
1-20   2016
Y. Takeuchi, K. Fujii, T. Morimae, and N. Imoto
1-16   2016
K. Fujii, H. Kobayashi, T. Morimae, H. Nishimura, S. Tamate, and S. Tani
43rd International Colloquium on Automata, Languages, and Programming (ICALP 2016)   55 13:1-13:14   2016   [Refereed]
T. Morimae, M. Hayashi, H. Nishimura, and K. Fujii
Quantum Information and Computation   15(15&16) 1420-1430   Oct 2015   [Refereed]
Keisuke Fujii
   Apr 2015
This is a comprehensive review on fault-tolerant topological quantum
computation with the surface codes. The basic concepts and useful tools
underlying fault-tolerant quantum computation, such as universal quantum
computation, stabilizer formalism...
K. Fujii, M. Negoro, N. Imoto, and M. Kitagawa
Physical Review X   4(4) 041039:1-041039:11   Dec 2014   [Refereed]
A. Matsuo, K. Fujii, and N. Imoto
Physical Review A   90(2) 022304:1-22304:16   Aug 2014   [Refereed]
T. Morimae, K. Fujii, and J. F. Fitzsimons
Physical Review Letters   112(13) 130502:1-130502:5   Apr 2014   [Refereed]
T. Morimae; K. Fujii
Physical Review Letters   111(2) 020502:1-020502:5   Jul 2013   [Refereed]
Keisuke Fujii
Interdisciplinary Information Sciences   19(1) 1-15   Jun 2013   [Refereed]
This is a short review on an interdisciplinary field of quantum information
science and statistical mechanics. We first give a pedagogical introduction to
the stabilizer formalism, which is an efficient way to describe an important
class of quantu...
T. Morimae; K. Fujii
Physical Review A - Atomic, Molecular, and Optical Physics   87(5,Pt.A) 050301:1R-05030:5R   May 2013   [Refereed]
K. Fujii, Y. Nakata, M. Ohzeki, and M. Murao
Physical Review Letters   110(12) 120502:1-120502:5   Mar 2013   [Refereed]
M. Ohzeki and K. Fujii
Physical Review E   86(5,Pt.1) 051121:1-051121:9   Nov 2012   [Refereed]
T. Morimae; K. Fujii
Nature Communications   3 1036:1-1036:6   Sep 2012   [Refereed]
K. Fujii; Y. Tokunaga
Physical Review A - Atomic, Molecular, and Optical Physics   86(2,Pt.A) 020303:1R-020303:5R   Aug 2012   [Refereed]
T. Morimae; K. Fujii
Scientific Reports   2 508:1-508:6   Jul 2012   [Refereed]
K. Fujii; T. Morimae
Physical Review A - Atomic, Molecular, and Optical Physics   85(3) 032338:1-032338:9   Mar 2012   [Refereed]
K. Fujii; T. Morimae
Physical Review A - Atomic, Molecular, and Optical Physics   85(1,Pt.A) 010304:1R-010304:5R   Jan 2012   [Refereed]
K. Fujii; H. Maeda; K. Yamamoto
Physical Review A - Atomic, Molecular, and Optical Physics   83(5) 050303(R)   May 2011   [Refereed]
K. Fujii; Y. Tokunaga
Physical Review Letters   105(25) 250503:1-250503:4   Dec 2010   [Refereed]
K. Fujii; K. Yamamoto
Physical Review A - Atomic, Molecular, and Optical Physics   82(6,Pt.A) 060301:1R-060301:4R   Dec 2010   [Refereed]
K. Fujii; K. Yamamoto
Physical Review A - Atomic, Molecular, and Optical Physics   82(4,Pt.A) 042109:1-042109:5   Oct 2010   [Refereed]
K. Fujii; K. Yamamoto
Physical Review A - Atomic, Molecular, and Optical Physics   81(4,Pt.A) 042324:1-042324:14   Apr 2010   [Refereed]
Keisuke Fujii, Katsuji Yamamoto
Physical Review A   80(4,Pt.A) 042308:1-042308:9   Oct 2009   [Refereed]
We investigate efficient entanglement purification through double selection
process. This method works with higher noise thresholds for the communication
channels and local operations, and achieves higher fidelity of purified states.
Furthermore i...
K. Fujii, K. Yamamoto
AIP Conference Proceedings   1110 141-144   2009   [Refereed]
Keisuke Fujii, Katsuji Yamamoto
   Nov 2006
We investigate a scheme of fault-tolerant quantum computation based on the
cluster model. Logical qubits are encoded by a suitable code such as the
Steane's 7-qubit code. Cluster states of logical qubits are prepared by
post-selection through veri...

Books etc

 
Quantum Computation with Topological Codes: From Qubit to Topological Fault-Tolerance (SpringerBriefs in Mathematical Physics Vol.8)
Keisuke Fujii
Springer   2015   ISBN:978-9812879950
Topological protection of quantum information (in Kinki University Series on Quantum Computing Vol.9 "Physics, Mathematics, and All That Quantum Jazz ")
Keisuke Fujii
World Scientific   2014   ISBN:978-9814602365

Conference Activities & Talks

 
Keisuke Fujii
Japan-Netherlands Quantum Conference   16 Sep 2019   
Keisuke Fujii
TQFT   3 Sep 2019   TQFT
Amarsanaa Davaasuren , Yasunari Suzuki , Keisuke Fujii , Masato Koashi , Yasunobu Nakamura
20th Anniversary of Superconducting Qubits (SQ20th): Progress and Future Directions   14 May 2019   SQ
Keisuke Fujii
20th Anniversary of Superconducting Qubits (SQ20th): Progress and Future Directions   13 May 2019   SQ
Application of Quantum Computers for Machine Learning and Quantum Chemistry [Invited]
Keisuke Fujii
ICCMSE 2019   4 May 2019   
Quantum computing: current status and prospects [Invited]
Keisuke Fujii
iTHEMS Colloquium   25 Apr 2019   
K. Fukui, A. Tomita, and K. Fujii
APS March Meeting 2019   7 Mar 2019   American Physical Society
March 4-8, 2019
Y. Suzuki, A. Davaasuren, K. Fujii, M. Koashi, and Y. Nakamura
APS March Meeting 2019   7 Mar 2019   American Physical Society
March 4-8, 2019
K. M. Nakanishi, K. Mitarai, and K. fujii
APS March Meeting 2019   6 Mar 2019   American Physical Society
March 4-8, 2019