2013 Fiscal Year Final Research Report
Control, measure, and transfer the quantum information in semiconductor nanostructures
| Project Area | Quantum cybernetics - interdisciplinary studies of quantum controls and developments toward quantum computing |
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| Project/Area Number |
21102003
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | University of Tsukuba (2011-2013)
NTT Basic Research Laboratories (2009-2010) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
OTA Takeshi 日本電信電話株式会社NTT物性科学基礎研究所, 量子電子物性研究部, 主任研究員 (30463623)
TARUCHA Seigo 東京大学, 大学院工学系研究科, 教授 (40302799)
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| Co-Investigator(Renkei-kenkyūsha) |
YAMAMOTO Michihisa 東京大学, 大学院工学系研究科, 助教 (00376493)
FUJISAWA Toshimasa 東京工業大学, 大学院理工学研究科, 教授 (20212186)
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| Project Period (FY) |
2009-07-23 – 2014-03-31
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| Keywords | 半導体物性 / 半導体超微細化 / ナノデバイス / 量子コンピュータ / 量子閉じ込め |
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| Research Abstract |
We have succeeded for the first time to demonstrate operations combining one-qubit unitary gate and two-qubit operation of spin qubits realized in quantum dot (QD) system. By improving device design, the world fastest x-rotation (127MHz) and z-rotation (50MHz) are achieved. We designed a micro-magnet structure that enable electron dipole spin resonance operations to individual spins in multi-QD array and succeeded in controlling three spins. In an InAs QD, the strength of spin-orbit interaction and g-tensor are precisely determined and controlled by gate. Combining tunnel-coupled quantum wires and an Aharonov-Bohm ring, the control of flying qubit is realized by the two-path interferometer. Using surface acoustic wave, single electrons are coherently transferred between distance QDs with success probability more than 90 %. We developed wide-band capacitance measurement system to detect the signal related to spin triplet state in a coupled QD system.
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[Journal Article] Coherent coupling of a superconducting flux qubit to an electron spin ensenlble in dianlond2011
Author(s)
X. Zhu, S. Saito, A. Kemp, K. Kakuyanagi, S. Karimoto, H. Nakano, W. J. Munro, Y. Tokura, M. S. Everitt, K. Nenloto, M. Kasu, N. Mizuochi, and K. Semba
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Journal Title
Nature
Volume: 478
Pages: 221
DOI
Peer Reviewed
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