Theory of quantum state control in photon-electron-nucleus coupled system

• Project/Area Number: 22540328
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: Kyoto Institute of Technology
• Principal Investigator: TAKAGAHARA Toshihide 京都工芸繊維大学, 工芸科学研究科, 教授 (00111469)
• Project Period (FY): 2010 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2010: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: スピンエレクトロニクス / 量子エレクトロニクス / 量子コンピュータ / 量子ドット / 量子メモリ / ドナー束縛励起子 / 超微細相互作用 / 量子計算 / 物性理論

Research Abstract

The nuclear spin polarization is realized optically in the system of Si:P and NV center in diamond but the perfect spin polarization is not yet achieved. Here we proposed an optical method to realize the perfect spin polarization of the nucleus in the general neutral donor system. First of all, the spin polarization of the donor electron can be realized optically through the spin-singlet donor-bound exciton state. Then the spin-triplet exciton state is optically excited and this state makes a transition to the spin-singlet exciton state thereby flipping the spin of the donor nucleus through the hyperfine interaction. This process is not based on the detailed balance and can achieve the perfect spin polarization of the nucleus by repetitive optical excitation

Research Products

• [Journal Article] A Proposed Scheme for the Electron and Nuclear Spin Initialization in General Localized Electron Systems (2011)
  • Author(s): T. Takagahara
  • Journal Title: Proceedings of the CLEO/QELS 2011, Optical Society of America Volume: JTuA6
  • Peer Reviewed
• [Journal Article] Topological transition by dielectric control of exciton wavefunction in thin nanotube structure (2011)
  • Author(s): M. Kumagai and T. Takagahara
  • Journal Title: Solid State Commun Volume: 151 Pages: 663-666
  • Peer Reviewed
• [Journal Article] Topological transition by dielectric control of exciton wavefunction in thin nsnotube structure (2011)
  • Author(s): M.Kumagai, T.Takagahara
  • Journal Title: Solid State Communication Volume: (印刷中)
  • Peer Reviewed
• [Journal Article] Theory of unitary spin rotation and spin-state tomography for a single electron and two electrons (2010)
  • Author(s): T. Takagahara
  • Journal Title: J. Opt. Soc. Am Volume: B 27
  • Peer Reviewed
• [Presentation] A Proposed Scheme for the Electron and Nuclear Spin Initialization in General Localized Electron Systems (2011)
  • Author(s): T. Takagahara
  • Organizer: CLEO/QELS 2011, Optical Society of America
  • Place of Presentation: Baltimore (米国).
  • Year and Date: 2011-05-11
• [Presentation] A Proposed Scheme for the Electron and Nucleeir Spin Initialization in General Localized Electron Systems (2011)
  • Author(s): T.Takagahara
  • Organizer: CLEO/QELS 2011
  • Place of Presentation: Baltimore, USA
  • Year and Date: 2011-05-05
• [Remarks]
  • URL: http://www.cis.kit.ac.jp/~takaghra/
• [Remarks]
  • URL: http://www.cis.kit.ac.jp/~takaghra/