Theory of quantum computer using ferromagnetic Josephson junctions

2008 Fiscal Year Final Research Report

• Project/Area Number: 19710085
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Nanostructural science
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: KAWABATA Shiro National Institute of Advanced Industrial Science and Technology, ナノテクノロジー研究部門, 主任研究員 (30356852)
• Project Period (FY): 2007 – 2008
• Keywords: 量子コンピュータ / スピントロニクス / ジョセフソン効果 / 磁性半導体 / 巨視的量子トンネル現象

Research Abstract

本研究においては、強磁性絶縁体を用いたジョセフソン接合の量子輸送及び巨視的量子ダイナミクスの理論・数値解析を行い、その基礎物性の予測及びコヒーレンス評価行う。そして、強磁性絶縁体ジョセフソン接合が量子ビットとして有望な素子となりうることを明らかにする。

Research Products

• [Journal Article] Effect of d-f hybridization on the Josephson current through Eu-chalcogenides (2009)
  • Author(s): S. Kawabata, Y. Asano, Y. Tanaka, and S. Kashiwaya
  • Journal Title: Physica C (受理)
  • Peer Reviewed
• [Journal Article] Cooper pairtransport and macroscopic quantum dynamics in Josephson junctions through ferromagnetic insulators (2008)
  • Author(s): S. Kawabata, Y. Asano, Y. Tanaka, S. Kashiwaya and A. A. Golubov
  • Journal Title: Physica C 468 Pages: 701-704
  • Peer Reviewed
• [Journal Article] Cooper pair transport and macroscopic quantum dynamics in Josephson junctions through ferromagnetic insulators (2008)
  • Author(s): S. Kawabata, Y. Asano, Y. Tanaka, S. Kashiwaya and A. A. Golubov
  • Journal Title: Physica C 468 Pages: 701-704
  • Peer Reviewed
• [Journal Article] Macroscopic quantum tunneling and quasiparticle-tunneling blockade effect in s-wave/d-wave hybrid junctions (2007)
  • Author(s): S. Kawabata, A. A. Golubov, Ariando, C. J. M. Verwijs, H. Hilgenkamp, and J. R. Kirtley
  • Journal Title: Physical Review B 76 Pages: 064505-1-064505-6
  • Peer Reviewed
• [Journal Article] Theory of Macroscopic Quantum Tunneling in High-Tc c-Axis Josephson Junction (2007)
  • Author(s): T. Yokoyama, S. Kawabata, T. Kato, and Y. Tanaka
  • Journal Title: Physical Review B 76 Pages: 134505-1-134505-
  • Peer Reviewed
• [Journal Article] Macroscopic Quantum Tunneling in piJosephson Junctions with Insulating Ferromagnets and its Application to Phase Qubits (2007)
  • Author(s): S. Kawabata and A. A. Golubov
  • Journal Title: Physica E 40 Pages: 386-389
  • Peer Reviewed
• [Presentation] Atomic-scale 0-π transition in ferromagnetic-insulator based Josephson junctions (2009)
  • Author(s): S. Kawabata, Y. Asano, Y. Tanaka, and S. Kashiwaya
  • Organizer: Joint JSPS-NES International Conference on Nanoscience and Engineering in Superconductivity
  • Place of Presentation: つくば市
  • Year and Date: 2009-03-24
• [Presentation] Josephson π-junction through spintronics materials (2009)
  • Author(s): S. Kawabata, Y. Asano, Y. Tanaka, and S. Kashiwaya
  • Organizer: International Symposium on Nanoscience and Quantum Physics
  • Place of Presentation: 東京
  • Year and Date: 2009-02-23
• [Presentation] Theory of Josephson effect through spintronics materials (2009)
  • Author(s): S. Kawabata, Y. Asano, Y. Tanaka, and S. Kashiwaya
  • Organizer: International Symposium on Nanoscale Transport and Technology (NTT2009)
  • Place of Presentation: 厚木市
  • Year and Date: 2009-01-12
• [Presentation] Theory of π -junction using spin filtering barrier (2008)
  • Author(s): S. Kawabata
  • Organizer: The 23rd Nishinomiya-Yukawa Memorial International Workshop Spin Transport in Condensed Matter
  • Place of Presentation: 京都市
  • Year and Date: 2008-11-11
• [Presentation] Effect of s-f hybridization on the Josephson current through spin filters (2008)
  • Author(s): S. Kawabata, Y. Asano, Y. Tanaka, and S. Kashiwaya
  • Organizer: 21st International Symposium on Superconductivity (ISS2008)
  • Place of Presentation: つくば市
  • Year and Date: 2008-10-29
• [Presentation] Theory of π -junction using spin filtering barriers (2008)
  • Author(s): S. Kawabata
  • Organizer: XXXII International Workshop on Condensed Matter Theories (CMT32)
  • Place of Presentation: Loughborough/イギリス
  • Year and Date: 2008-08-15
• [Presentation] Cooper pair transport and macroscopic quantum dynamics in Josephson junctions through ferromagnetic insulators (2007)
  • Author(s): S. Kawabata, and Y. Asano
  • Organizer: Joint ESF and JSPS Conference on Vortex Matter in Nanostructured Superconductors
  • Place of Presentation: Rhodes/ギリシャ
  • Year and Date: 2007-09-13
• [Presentation] π junction formation in Josephson junctions with ferromagnetic insulator: physics and qubit application (2007)
  • Author(s): S. Kawabata
  • Organizer: Lorentz Workshop on Physics of Nanoscale Superconducting Heterostructures
  • Place of Presentation: Leiden/オランダ
  • Year and Date: 2007-07-02