Qubus Quantum Computer

2010 Fiscal Year Final Research Report

• Project/Area Number: 18001002
• Research Category: Grant-in-Aid for Specially Promoted Research
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering; Mathematics and Physics
• Research Institution: National Institute of Informatics
• Principal Investigator: YAMAMOTO Yoshihisa 国立情報学研究所, 情報学プリンシプル研究系, 教授 (60370102)
• Co-Investigator(Kenkyū-buntansha): ITOH Kohei 慶應義塾大学, 理工学部, 教授 (30276414) ; SEMBA Kouichi NTT物性科学基礎研究所, 量子電子物性研究部・超伝導量子物理研究グループ, グループリーダー (50393773) ; NEMOTO Kae 国立情報学研究所, 情報学プリンシプル研究系, 教授 (80370104)
• Research Collaborator: SPILLER Timothy P. University of Leeds, Professor ; MILBURN Gerard University of Queensland, Department of Physics, Professor ; MUNRO William J. NTT物性科学基礎研究所, 量子光物性研究部, リサーチスペシャリスト
• Project Period (FY): 2006 – 2010
• Keywords: 量子コンピュータ / 超高速情報処理 / 微小共振器 / 光物性 / 超伝導材料・素子 / 電子スピン / 磁気共鳴 / Cavity & circuit QED

Research Abstract

Architectures and system constituent technologies for fault-tolerant quantum computers based on coherent optical pulses and solid state qubits are studied. We proposed the layered architecture with topological surface codes and showed the total number of physical qubits of 10^8-10^9 and computational time of 1-10 days are needed to perform meaningful computations. We also developed the coherent optical pulse controlled spin qubit and variable tunnel energy Josephson junction flux qubit technologies.

Research Products

• [Journal Article] Coherent storage of photoexcited triplet states using ^<29>Si nuclear spins in silicon (2012)
  • Author(s): W. Akhtar, V. Filidou, T. Sekiguchi, E. Kawakami, T. Itahashi, L. Vlasenko, J. J. L. Morton, and K. M. Itoh
  • Journal Title: Phys. Rev. Lett. Volume: 108 Pages: 097601
  • DOI: DOI:10.1103/PhysRevLett.108.097601
  • Peer Reviewed
• [Journal Article] Electron spin coherence exceeding seconds in high purity silicon (2012)
  • Author(s): A. M. Tyryshkin, S. Tojo, J. J. L. Morton, H. Riemann, N. V. Abrosimov, P. Becker, H.-J. Pohl, T. Schenkel, M. L. W. Thewalt, K. M. Itoh, and S. A. Lyon
  • Journal Title: Nature Materials Volume: 11 Pages: 143-147
  • DOI: DOI:10.1038/nmat3182
  • Peer Reviewed
• [Journal Article] Coherent coupling of a superconducting flux qubit to an electron spin ensemble in diamond (2011)
  • Author(s): X. Zhu, S. Saito, A. Kemp, K. Kakuyanagi, S. Karimoto, H. Nakano, W. J. Munro, Y. Tokura, M. S. Everitt, K. Nemoto, M. Kasu, N. Mizuochi, and K. Semba
  • Journal Title: Nature Volume: 478 Pages: 221-224
  • Peer Reviewed
• [Journal Article] Superconducting qubit as a quantum transformer routing entanglement between a microscopic quantum memory and a macroscopic resonator (2011)
  • Author(s): A. Kemp, S. Saito, W. J. Munro, K. Nemoto, and K. Semba
  • Journal Title: Phys. Rev. B Volume: 84 Pages: 104505
  • Peer Reviewed
• [Journal Article] Dynamical d-wave condensation of exciton-polaritons in a two-dimensional square-lattice potential (2011)
  • Author(s): N. Y. Kim, K. Kusudo, C. Wu, N. Masumoto, A. Loffler, S. Hofling, N. Kumada, L. Worschech, A. Forchel, and Y. Yamamoto
  • Journal Title: Nature Physics Volume: 7 Pages: 681-686
  • DOI: DOI:10.1038/nphys2012
  • Peer Reviewed
• [Journal Article] Entanglement in a solid-state spin ensemble (2011)
  • Author(s): S. Simmons, R. M. Brown, H. Riemann, N. V. Abrosimov, P. Becker, H.-J. Pohl, M. L. W. Thewalt, K. M. Itoh, and J. J. L. Morton
  • Journal Title: Nature Volume: 470 Pages: 69-72
  • DOI: DOI:10.1038/nature09696
  • Peer Reviewed
• [Journal Article] Storage of multiple coherent microwave excitations in an electron spin ensemble (2010)
  • Author(s): H. Wu, R. E. George, J. H. Wesenberg, K. Molmer, D. I. Schuster, R. J. Schoelkopf, K. M. Itoh, A. Ardavan, J. J. L. Morton, and G. A. D. Briggs
  • Journal Title: Phys. Rev. Lett. Volume: 105 Pages: 140503
  • DOI: DOI:10.1103/PhysRevLett.105.140503
  • Peer Reviewed
• [Journal Article] Electron spin coherence of phosphorus donors in silicon: Effect of environmental nuclei (2010)
  • Author(s): E. Abe, A. M. Tyryshkin, S. Tojo, J. J. L. Morton, W. M. Witzel, A. Fujimoto, J. W. Ager, E. E. Haller, J. Isoya, S. A. Lyon, M. L. W. Thewalt, and K. M. Itoh
  • Journal Title: Phys. Rev. B Volume: 82 Pages: 121201(R)
  • DOI: DOI:10.1103/PhysRevB.82.121201
  • Peer Reviewed
• [Journal Article] From quantum multiplexing to high-performance quantum networking (2010)
  • Author(s): W. J. Munro, K. A. Harrison, A. M. Stephens, S. J. Devitt, and K. Nemoto
  • Journal Title: Nature Photonics Volume: 4 Pages: 792-796
  • DOI: DOI:10.1038/nphoton.2010.213
  • Peer Reviewed
• [Journal Article] Ultrafast optical spin echo in a single quantum dot (2010)
  • Author(s): D. Press, K. De Greve, P.L. McMahon, T.D. Ladd, B. Friess, C. Schneider, M. Kamp, S. Hofling, A. Forchel, and Y. Yamamoto
  • Journal Title: Nature Photonics Volume: 4 Pages: 367-370
  • DOI: DOI:10.1038/nphoton.2010.83
  • Peer Reviewed
• [Journal Article] Architectural design for a topological cluster state quantum computer (2009)
  • Author(s): S. J Devitt, A. G. Fowler, A. M. Stephens, A. D. Greentree, L. C. L Hollenberg, W. J. Munro, and K. Nemoto
  • Journal Title: New J. Phys. Volume: 11 Pages: 083032
  • DOI: DOI:10.1088/1367-2630/11/8/083032
  • Peer Reviewed
• [Journal Article] Quantum repeater with encoding (2009)
  • Author(s): L. Jiang, J. M. Taylor, K. Nemoto, W. J. Munro, R. V. Meter, and M. D. Lukin
  • Journal Title: Phys. Rev. A Volume: 79 Pages: 032325
  • DOI: DOI:10.1103/PhysRevA.79.032325
  • Peer Reviewed
• [Journal Article] Quantum state control, entanglement, and readout of the Josephson persistent-current qubit (2009)
  • Author(s): K. Semba, J. Johansson, K. Kakuyanagi, H. Nakano, S. Saito, H. Tanaka, and H. Takayanagi
  • Journal Title: Quantum Information Processing(Special Issue: Quantum Computing with Superconducting Qubits, Ed. By A. Korotkov, Springer-Verlag) Volume: Volume 8, Issue 2 Pages: 199-215
  • DOI: DOI:10.1007/s11128-009-0098-9
  • Peer Reviewed
• [Journal Article] Complete quantum control of a single quantum dot spin using ultrafast optical pulses (2008)
  • Author(s): D. Press, T.D. Ladd, B. Zhang, and Y. Yamamoto
  • Journal Title: Nature Volume: 456 Pages: 218-221
  • DOI: DOI:10.1038/nature07530
  • Peer Reviewed
• [Journal Article] Observation of Bogoliubov excitations in exciton-polariton condensates (2008)
  • Author(s): S. Utsunomiya, L. Tian, G. Roumpos, C.W. Lai, N. Kumada, T. Fujisawa, M. Kuwata-Gonokami, A. Loffler, S. Hofling, A. Forchel, and Y. Yamamoto
  • Journal Title: Nature Physics Volume: 4 Pages: 700-705
  • DOI: DOI:10.1038/nphys1034
  • Peer Reviewed
• [Journal Article] High-bandwidth hybrid quantum repeater (2008)
  • Author(s): W. J. Munro, R. Van Meter, S. G. R. Louis, and K. Nemoto
  • Journal Title: Phys. Rev. Lett. Volume: 101 Pages: 040502
  • DOI: DOI:10.1103/PhysRevLett.101.040502
  • Peer Reviewed
• [Journal Article] Coherent zero-state and π-state in an exciton-polariton condensate array (2007)
  • Author(s): C. W. Lai, N. Y. Kim, S. Utsunomiya, G. Roumpos, H. Deng, M. D. Fraser, T. Byrnes, P. Recher, N. Kumada, T. Fujisawa, and Y. Yamamoto
  • Journal Title: Nature Volume: 450 Pages: 529-532
  • DOI: DOI:10.1038/nature06334
  • Peer Reviewed
• [Journal Article] Vacuum Rabi oscillations in a macroscopic superconducting qubit LC oscillator system (2006)
  • Author(s): J. Johansson, S. Saito, T. Meno, H. Nakano, M. Ueda, K. Semba, and H. Takayanagi
  • Journal Title: Phys. Rev. Lett. Volume: 96 Pages: 127006
  • DOI: DOI:10.1103/PhysRevLett.96.127006
  • Peer Reviewed
• [Presentation] Coupling an ensemble to a superconducting qubit (2011)
  • Author(s): X. Zhu
  • Organizer: 26th International Conference on Low Temperature Physics (LT26)
  • Place of Presentation: Beijing, China
  • Year and Date: 2011-08-11
• [Presentation] Vacuum Rabi oscillations observed in a flux qubit LC-oscillator system (2007)
  • Author(s): K. Semba
  • Organizer: American Physical Society Match meeting
  • Place of Presentation: Denver, USA
  • Year and Date: 2007-03-05
• [Remarks]
  • URL: http://www.qis-tokyo.jp/index.html
• [Remarks]
  • URL: http://www.appi.keio.ac.jp/Itoh_group/
• [Remarks]
  • URL: http://www.brl.ntt.co.jp/J/group_007/group_007.html
• [Remarks]
  • URL: http://www.qis.ex.nii.ac.jp/
• [Patent(Industrial Property Rights)] 量子計算装置および量子もつれ制御方法 (2012)
  • Inventor(s): 角柳孝輔、中ノ勇人、仙場浩一、上田正仁
  • Industrial Property Rights Holder: 日本電信電話株式会社
  • Industrial Property Number: 特許,4913501
  • Acquisition Date: 2012-01-27
• [Patent(Industrial Property Rights)] 素子状態読み出し装置、方法、および透過型ジョセフソン共振回路 (2011)
  • Inventor(s): 角柳孝輔、仙場浩一
  • Industrial Property Rights Holder: 日本電信電話株式会社
  • Industrial Property Number: 特許,4733085
  • Acquisition Date: 2011-04-28
• [Patent(Industrial Property Rights)] 量子状態制御方法 (2010)
  • Inventor(s): 角柳孝輔、ケンプ アレクサンダー、仙場浩一
  • Industrial Property Rights Holder: 日本電信電話株式会社
  • Industrial Property Number: 特許,2010-205245
  • Filing Date: 2010-09-14
• [Patent(Industrial Property Rights)] 超伝導磁束量子ビット回路 (2010)
  • Inventor(s): ズー・シャオボ、齊藤志郎、ケンプ・アレクサンダー,仙場浩一
  • Industrial Property Rights Holder: 日本電信電話株式会社
  • Industrial Property Number: 特許,特願2010-151720
  • Filing Date: 2010-07-02
• [Patent(Industrial Property Rights)] 多量子ビット量子演算装置 (2010)
  • Inventor(s): 角柳孝輔、ケンプ アレクサンダー、齊藤志郎、仙場浩一
  • Industrial Property Rights Holder: 日本電信電話株式会社
  • Industrial Property Number: 特許,2010-062311
  • Filing Date: 2010-03-18
• [Patent(Industrial Property Rights)] 測定装置 (2009)
  • Inventor(s): 角柳孝輔、仙場浩一
  • Industrial Property Rights Holder: 日本電信電話株式会社
  • Industrial Property Number: 特許,特願2009-121380
  • Filing Date: 2009-05-19