Fabrication and control of nuclear-and electron spin quantum bits
| Project/Area Number |
14076215
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Keio University |
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Principal Investigator |
ITOH Kohei Keio University, Faculty of Science and Technology, Associate Professor, 理工学部, 助教授 (30276414)
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| Co-Investigator(Kenkyū-buntansha) |
TARUCHA Seigo University of Tokyo, Graduate School of Engineering, Professor, 物理工学研究所, 教授 (40302799)
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| Project Period (FY) |
2002 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥43,000,000 (Direct Cost: ¥43,000,000)
Fiscal Year 2005: ¥11,100,000 (Direct Cost: ¥11,100,000)
Fiscal Year 2004: ¥11,100,000 (Direct Cost: ¥11,100,000)
Fiscal Year 2003: ¥9,600,000 (Direct Cost: ¥9,600,000)
Fiscal Year 2002: ¥11,200,000 (Direct Cost: ¥11,200,000)
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| Keywords | Spin / Semiconductor / Isotope / Quantum control / Spintronics |
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| Research Abstract |
We have performed fundamental research on quantum manipulation of 29Si nuclear spins that are artificially placed in a well-defined manner in isotopically controlled silicon single crystals. Here spin manipulation refers to as initialization (polarization enhancement) and extension of phase coherence time by appropriate irradiation of pulsed radio frequency sequences.
As a first step, we have successfully understood physics of silicon surfaces for appropriate placing of specific silicon isotopes in a very well-defined manner and succeeded in realization of atomic arrays that were suitable for silicon nuclear spin quantum computation. We have also proposed new methods to initialize 29Si nuclear spins using either light or electron spin resonance, and confirmed their effectiveness experimentally by increasing the nuclear spin polarization by the three orders of magnitude. In parallel, we have succeeded in extension of the phase coherence time up to 25 seconds at room temperature. For the readout, we have proposed new methods based on light or electron spin resonance and experimentally demonstrated successful readout of the nuclear spin states in silicon.
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Report
(5 results)
Research Products
(82 results)
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[Journal Article] Novel Phase Diagram of Superconductivity and Ferromagnetism in UGe_2 : a ^<73>Ge-NQR Study under High Pressure2005
Author(s)
Y.Kitaoka, H.Kotegawa, A.Harada, S.Kawasaki, Y.Kawasaki, Y.Haga, E.Yamamoto, Y.Onuki, K.M.Itoh, E.E.Haller, H.Harima
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Journal Title
J.Phys. : Condens.Matter 17
Pages: 975-986
Related Report
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[Journal Article] Evidence for the Microscopic Coexistence of Superconductivity and Ferromagnetism in UGe_2 : ^<73>Ge-NMR/NQR Study2005
Author(s)
A.Harada, H.Kotegawa, S.Kawasaki, Y.Kawasaki, G.-q.Zheng, Y.Kitaoka, E.Yamamoto, Y.Haga, Y.Onuki, K.Itoh, E.E.Haller
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Journal Title
Physica B 359-361
Pages: 1057-1059
Related Report
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[Journal Article] High Purity Isotopically Enriched 29Si and 30Si Single Crystals : Isotope Separation, Purification, and Growth2003
Author(s)
K.M.Itoh, J.Kato, F.Uemura, A.K.Kaliteyevskii, O.N.Godisov, G G.Devyatych, A.D.Bulanov, A.V.Gusev, I.D.Kovalev, P.G.Sennikov, H.-J.Pohl, N.V.Abrosimov, H.Riemann
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Journal Title
Jpn. J. Appl. Phys. Pt. 1,42
Pages: 6248-6251
Description
「研究成果報告書概要(欧文)」より
Related Report
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