2016 Fiscal Year Annual Research Report
Charge and spin nonlocal interaction in SiGe hybrid cQED architecture
| Project/Area Number |
15H03524
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
デルベック マシュー 国立研究開発法人理化学研究所, 創発物性科学研究センター, 特別研究員 (00700121)
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| Co-Investigator(Kenkyū-buntansha) |
樽茶 清悟 国立研究開発法人理化学研究所, 創発物性科学研究センター, グループディレクター (40302799)
中島 峻 国立研究開発法人理化学研究所, 創発物性科学研究センター, 特別研究員 (60534344)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Keywords | fabrication / characterisation / nuclear spins |
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| Outline of Annual Research Achievements |
in the fiscal year FY2015, the main workload was devoted to the development of the device fabrication. Difficulties where unfortunately encountered in the fabrication of the quantum dots. However, the fabrication and characterization of the superconducting resonators went as planned. We succeeded in realizing resonators with quality factors of around 30000, which is one order of magnitude larger than the one realized in GaAs, demonstrating one of the advantages of using SiGe as a two-dimensional gas heterostructure for our hybrid cQED architecture. As a side work, we studied in detail the the influence of the dynamics of the nuclear spins of the host material on the dephasing of an electronic spin in GaAs (containing 100% of nuclear spins) on short time scales. This work has important implications for the current project : when we will couple an electronic spin in SiGe (interacting with 4.8% of nuclear spins) to photons, the typical interaction time scale will be even shorter, leading to longer coherence times than anticipated and opening the possibility to study the nuclear spins dynamics on even shorter time scales.
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| Research Progress Status |
28年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
28年度が最終年度であるため、記入しない。
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[Journal Article] Quantum Dephasing in a Gated GaAs Triple Quantum Dot due to Nonergodic Noise2016
Author(s)
M.R. Delbecq, T. Nakajima, P. Stano, T. Otsuka, S. Amaha, J. Yoneda, K. Takeda, G. Allison, A. Ludwig, A.D. Wieck, and S. Tarucha
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Journal Title
Physical Review Letters
Volume: 116
Pages: 46802
DOI
