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2016 Fiscal Year Annual Research Report

Charge and spin nonlocal interaction in SiGe hybrid cQED architecture

Research Project

Project/Area Number 15H03524
Research InstitutionInstitute of Physical and Chemical Research

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)

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)
Project Period (FY) 2015-04-01 – 2017-03-31
Keywordsfabrication / characterisation / nuclear spins
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.

Research Progress Status

28年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

28年度が最終年度であるため、記入しない。

  • Research Products

    (1 results)

All 2016

All Journal Article (1 results)

  • [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
    • Journal Title

      Physical Review Letters

      Volume: 116 Pages: 46802

    • DOI

      10.1103/PhysRevLett.116.046802

URL: 

Published: 2018-01-16  

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