高速量子プローブを用いた微小系の電子輸送ゆらぎの研究

2016 Fiscal Year Annual Research Report

• Project Area: Synergy of Fluctuation and Structure:Foundation of Universal Laws in Nonequilibrium Systems
• Project/Area Number: 16H00817
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: 大塚 朋廣 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, 客員研究員 (50588019)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 量子ドット / ミクロプローブ / ナノ・マイクロデバイス

Outline of Annual Research Achievements

本研究では、半導体微細構造を活用した微小系を用いて、微小系における電子輸送、およびそのゆらぎとダイナミクスを測定した。本年度は特に高速量子プローブの性能評価、微小系における局所電子状態のダイナミクスの測定を中心に行った。
微小系における電子輸送、およびそのダイナミクスを調べるためには、微小系中の局所電子状態に直接的にアクセスでき、また高速に動作できるミクロなプローブが有用となる。このようなプローブとして、半導体量子ドットを用いたミクロなプローブを作製し、高周波測定技術を活用することにより高速な動作を実現する高速量子プローブを開発してきた。これを改良発展させて、高速量子プローブの単一電子移動の検出感度を評価し、マイクロ秒程度の積分時間で単一電荷を検出できることを確認した。またプローブ動作の安定性についても検証を行い、微小系の電子輸送現象を測定するのに十分な安定度を持つことを確認した。
またこの高速量子プローブを活用することにより、微小系における局所電子状態とそのダイナミクスの測定を開始した。微小系における局所電子状態は、基礎科学やエレクトロニクス等への応用の両面から注目を集めており、ミクロな観点からの解明が重要となる。半導体量子ドットからなる開放微小系における局所電子状態ダイナミクスを測定したところ、電子状態が時間とともに変化する様子が観測され、電子状態の時間変化を単一電荷のレベルで測定することができた。

Current Status of Research Progress

1: Research has progressed more than it was originally planned.

Reason

半導体量子ドットを用いた微小系における局所電子状態測定に高速量子プローブを活用し、局所電子状態ダイナミクスを単一電子レベルで精度良く測定できるようになったため。

Strategy for Future Research Activity

高速量子プローブを活用した局所電子状態測定を更に進め、微小系における電子輸送やそのゆらぎ、ダイナミクスの解明を進める。

Research Products

• [Int'l Joint Research] ルール大学ボーフム(ドイツ)
  • Country Name: GERMANY
  • Counterpart Institution: ルール大学ボーフム
• [Int'l Joint Research] バーゼル大学(スイス)
  • Country Name: SWITZERLAND
  • Counterpart Institution: バーゼル大学
• [Journal Article] A fault-tolerant addressable spin qubit in a natural silicon quantum dot (2016)
  • Author(s): Takeda K.、Kamioka J.、Otsuka T.、Yoneda J.、Nakajima T.、Delbecq M. R.、Amaha S.、Allison G.、Kodera T.、Oda S.、Tarucha S.
  • Journal Title: Science Advances Volume: 2 Pages: e1600694-1-6
  • DOI: 10.1126/sciadv.1600694
  • Peer Reviewed / Open Access
• [Journal Article] Single-electron Spin Resonance in a Quadruple Quantum Dot (2016)
  • Author(s): Otsuka Tomohiro、Nakajima Takashi、Delbecq Matthieu R.、Amaha Shinichi、Yoneda Jun、Takeda Kenta、Allison Giles、Ito Takumi、Sugawara Retsu、Noiri Akito、Ludwig Arne、Wieck Andreas D.、Tarucha Seigo
  • Journal Title: Scientific Reports Volume: 6 Pages: 31820-1-6
  • DOI: 10.1038/srep31820
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Detection and control of charge states in a quintuple quantum dot (2016)
  • Author(s): Ito Takumi、Otsuka Tomohiro、Amaha Shinichi、Delbecq Matthieu R.、Nakajima Takashi、Yoneda Jun、Takeda Kenta、Allison Giles、Noiri Akito、Kawasaki Kento、Tarucha Seigo
  • Journal Title: Scientific Reports Volume: 6 Pages: 39113-1-7
  • DOI: doi:10.1038/srep39113
  • Peer Reviewed / Open Access
• [Presentation] Multiplexed reflectometry measurement of a gate-defined Si-MOS quantum dot (2016)
  • Author(s): Jun Yoneda, Takumu Honda, Kenta Takeda, Marian Marx, Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Shinich Amaha, Giles Allison, Tetsuo Kodera, Syunri Oda, and Seigo Tarucha
  • Organizer: Silicon Quantum Electronics Workshop
  • Int'l Joint Research
• [Presentation] Measurement of charge states in Si/SiGe multiple quantum dots (2016)
  • Author(s): Tomohiro Otsuka, Kenta Takeda, Jun Yoneda, Takumu Honda, Matthieu R. Delbecq, Giles Allison, Marian Marx, Takashi Nakajima, Tetsuo Kodera, Syunri Oda, Yusuke Hoshi, Noritaka Usami, Kohei M. Itoh and Seigo Tarucha
  • Organizer: Silicon Quantum Electronics Workshop
  • Int'l Joint Research
• [Presentation] AC Stark effect and optimal control of a strongly driven Si/SiGe quantum dot spin qubit (2016)
  • Author(s): Kenta Takeda, Jun Kamioka, Jun Yoneda, Tomohiro Otsuka, Matthieu R. Delbecq, Giles Allison, Takashi Nakajima, Tetsuo Kodera, Syunri Oda, and Seigo Tarucha
  • Organizer: Silicon Quantum Electronics Workshop
  • Int'l Joint Research
• [Presentation] Quantum dephasing of spin qubits due to nonergodic noise (2016)
  • Author(s): Matthieu R. Delbecq, Takashi Nakajima, Peter Stano, Tomohiro Otsuka, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
  • Organizer: International Conference on The Physics of Semiconductors
  • Int'l Joint Research
• [Presentation] Tunneling induced spin relaxation in a quantum dot-lead coupled system (2016)
  • Author(s): Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Akito Noiri, Takumi Ito, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
  • Organizer: International Conference on The Physics of Semiconductors
  • Int'l Joint Research
• [Presentation] Detection and control of charge states of a quintuple quantum dot in a scalable multiple quantum dot architecture (2016)
  • Author(s): Takumi Ito, Tomohiro Otsuka, Shinichi Amaha, Matthieu R. Delbecq, Takashi Nakajima, Jun Yoneda, Kenta Takeda, Giles Allison, Akito Noiri, Kento Kawasaki, and Seigo Tarucha
  • Organizer: International Conference on The Physics of Semiconductors
  • Int'l Joint Research
• [Presentation] Three single spin qubits in a triple quantum dot (2016)
  • Author(s): Akito Noiri, Takashi Nakajima, Jun Yoneda, Matthieu R. Delbecq, Tomohiro Otsuka, Kenta Takeda, Giles Allison, Shinichi Amaha, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
  • Organizer: International Conference on Physics and Applications of Spin-Related Phenomena in Solids
  • Int'l Joint Research
• [Presentation] Measurement of charge states in multiple quantum dots utilizing multiplexed fast charge sensors (2016)
  • Author(s): Takumi Ito, Tomohiro Otsuka, Shinichi Amaha, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Takashi Nakajima, and Seigo Tarucha
  • Organizer: International workshop on nano-spin conversion science & quantum spin dynamics
  • Int'l Joint Research
• [Presentation] Hybrid cQED architecture as a model system for non-equilibrium physics in condensed matter (2016)
  • Author(s): Marian Marx, Giles Allison, Matthieu R. Delbecq, Takashi Nakajima, Jun Yoneda, Kenta Takeda, Tomohiro Otsuka, Shinichi Amaha, and Seigo Tarucha
  • Organizer: International workshop on nano-spin conversion science & quantum spin dynamics
  • Int'l Joint Research
• [Presentation] Measuring the time dependence of a Rabi oscillation of an electron spin in a semiconductor quantum dot (2016)
  • Author(s): Akito Noiri, Takashi Nakajima, Jun Yoneda, Tomohiro Otsuka, Kenta Takeda, Matthieu R. Delbecq, Giles Allison, Kento Kawasaki, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
  • Organizer: International workshop on nano-spin conversion science & quantum spin dynamics
  • Int'l Joint Research
• [Presentation] High-Fidelity Readout of Two-Spin Correlations Using a Metastable Charge State in Triple Quantum Dots (2016)
  • Author(s): Takashi Nakajima, Matthieu R. Delbecq, Tomohiro Otsuka, Peter Stano, Shinichi Amaha, Jun Yoneda, Akito Noiri, Kento Kawasaki, Kenta Takeda, Giles Allison, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
  • Organizer: International workshop on nano-spin conversion science & quantum spin dynamics
  • Int'l Joint Research
• [Presentation] Centre resonance frequency shift of a strongly driven spin qubit (2016)
  • Author(s): Kenta Takeda, Jun Kamioka, Jun Yoneda, Tomohiro Otsuka, Matthieu R. Delbecq, Giles Allison, Takashi Nakajima, Tetsuo Kodera, Shunri Oda, and Seigo Tarucha
  • Organizer: International workshop on nano-spin conversion science & quantum spin dynamics
  • Int'l Joint Research
• [Presentation] High-fidelity spin control in an enriched Si/SiGe quantum dot with a micromagnet (2016)
  • Author(s): Jun Yoneda, Kenta Takeda, Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Giles Allison, Takumu Honda, Tetsuo Kodera, Shunri Oda, Yusuke Hoshi, Noritaka Usami, Kohei M. Itoh, and Seigo Tarucha
  • Organizer: International workshop on nano-spin conversion science & quantum spin dynamics
  • Int'l Joint Research
• [Presentation] Lowering electron temperature for measurement of spin relaxation in quantum dots (2016)
  • Author(s): Giles Allison, Jun Yoneda, Kenta Takeda, Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Shinich Amaha, Akito Noiri, Takumi Ito, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
  • Organizer: International workshop on nano-spin conversion science & quantum spin dynamics
  • Int'l Joint Research
• [Presentation] Charge and spin dynamics in a quantum dot‐lead coupled system (2016)
  • Author(s): Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Peter Stano, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
  • Organizer: International workshop on nano-spin conversion science & quantum spin dynamics
  • Int'l Joint Research
• [Remarks] 研究成果報告用個人ページ
  • URL: http://ja.tomootsuka.net