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

2017 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、ゆらぎ、ダイナミクスの測定、解明を行った。本年度は特に高速量子プローブを活用した微小系における局所電子状態のダイナミクス測定、量子微小系の局所電子状態測定を中心に実施した。
微小系における局所電子状態およびそのダイナミクスは、物性科学等の基礎科学やエレクトロニクスデバイス等の応用の両面から重要となっている。この微小系における局所電子状態について、高速量子プローブを使って引き続き測定し、またその結果の解析を行った。半導体量子ドットからなる開放微小系について、局所電子状態の測定を実施したところ、局所電子状態が電極との結合に依存してマイクロ秒程度の時間スケールで変化する様子を観測した。さらに半導体量子ドット中の局所電子状態の時間変化の詳細を調べたところ、トンネルの低次の過程と、高次の過程による電子状態変化をミクロな観点から解明することができた。
また高速量子プローブで開発してきた測定手法は、古典微小系だけでなく量子現象が発現する量子微小系に対しても適用可能である。量子微小系は量子エレクトロニクス、量子情報処理等に向けて近年、注目を集めており、本研究では高速量子プローブの技術を活用して量子微小系における局所電子状態測定を行った。この結果、量子ドット内状態の高精度操作、多重量子ドットにおける電子状態操作の実現等に貢献した。

Research Progress Status

29年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

29年度が最終年度であるため、記入しない。

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 triangular triple quantum dot with tunable tunnel couplings (2017)
  • Author(s): Noiri A、Kawasaki K、Otsuka T、Nakajima T、Yoneda J、Amaha S、Delbecq M R、Takeda K、Allison G、Ludwig A、Wieck A D、Tarucha S
  • Journal Title: Semiconductor Science and Technology Volume: 32 Pages: 084004-1-5
  • DOI: 10.1088/1361-6641/aa7596
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Robust Single-Shot Spin Measurement with 99.5% Fidelity in a Quantum Dot Array (2017)
  • Author(s): Nakajima Takashi、Delbecq Matthieu R.、Otsuka Tomohiro、Stano Peter、Amaha Shinichi、Yoneda Jun、Noiri Akito、Kawasaki Kento、Takeda Kenta、Allison Giles、Ludwig Arne、Wieck Andreas D.、Loss Daniel、Tarucha Seigo
  • Journal Title: Physical Review Letters Volume: 119 Pages: 017701-1-6
  • DOI: 10.1103/PhysRevLett.119.017701
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Higher-order spin and charge dynamics in a quantum dot-lead hybrid system (2017)
  • Author(s): Otsuka Tomohiro、Nakajima Takashi、Delbecq Matthieu R.、Amaha Shinichi、Yoneda Jun、Takeda Kenta、Allison Giles、Stano Peter、Noiri Akito、Ito Takumi、Loss Daniel、Ludwig Arne、Wieck Andreas D.、Tarucha Seigo
  • Journal Title: Scientific Reports Volume: 7 Pages: 12201-1-7
  • DOI: 10.1038/s41598-017-12217-6
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Cotunneling spin blockade observed in a three-terminal triple quantum dot (2017)
  • Author(s): Noiri A.、Takakura T.、Obata T.、Otsuka T.、Nakajima T.、Yoneda J.、Tarucha S.
  • Journal Title: Physical Review B Volume: 96 Pages: 155414-1-7
  • DOI: 10.1103/PhysRevB.96.155414
  • Peer Reviewed
• [Journal Article] A quantum-dot spin qubit with coherence limited by charge noise and fidelity higher than 99.9% (2017)
  • Author(s): Yoneda Jun、Takeda Kenta、Otsuka Tomohiro、Nakajima Takashi、Delbecq Matthieu R.、Allison Giles、Honda Takumu、Kodera Tetsuo、Oda Shunri、Hoshi Yusuke、Usami Noritaka、Itoh Kohei M.、Tarucha Seigo
  • Journal Title: Nature Nanotechnology Volume: 13 Pages: 102-106
  • DOI: 10.1038/s41565-017-0014-x
  • Peer Reviewed
• [Presentation] Dynamics of an open quantum system based on gated GaAs quantum dots (2018)
  • Author(s): Sen Li, Tomohiro Otsuka, Giles Allison, Akito Noiri, Jun Yoneda, Kenta Takeda, Takashi Nakajima, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
  • Organizer: International Symposium on Dynamics in Artificial Quantum Systems
  • Int'l Joint Research
• [Presentation] Different charge and spin dynamics in a quantum dot-lead coupled system (2018)
  • Author(s): Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Peter Stano, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
  • Organizer: International Symposium on Dynamics in Artificial Quantum Systems
  • Int'l Joint Research
• [Presentation] A 99.9%-fidelity spin qubit in isotopically purified silicon with charge-noise-limited coherence (2018)
  • 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 Symposium on Dynamics in Artificial Quantum Systems
  • Int'l Joint Research
• [Presentation] A two-qubit entangling gate between spin qubits of different kinds (2018)
  • Author(s): Akito Noiri, Takashi Nakajima, Jun Yoneda, Matthieu R. Delbecq, Peter Stano, Tomohiro Otsuka, Kenta Takeda, Shinichi Amaha, Giles Allison, Kento Kawasaki, Arne Ludwig, Andreas D. Wieck, Daniel Loss, and Seigo Tarucha
  • Organizer: International Symposium on Dynamics in Artificial Quantum Systems
  • Int'l Joint Research
• [Presentation] Difference in charge and spin dynamics in a quantum dot-lead hybrid system (2017)
  • Author(s): Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Peter Stano, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha
  • Organizer: International Conference on Electronic Properties of Two Dimensional Systems
  • Int'l Joint Research
• [Presentation] Quantum non-demolition readout of a single spin in a quantum dot (2017)
  • Author(s): Akito Noiri, Takashi Nakajima, Jun Yoneda, Tomohiro Otsuka, Kenta Takeda, Matthieu R. Delbecq, Kento Kawasaki, Giles Allison, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha
  • Organizer: International Conference on Electronic Properties of Two Dimensional Systems
  • Int'l Joint Research
• [Presentation] Enhancing coherence of a single electron spin with adaptive control (2017)
  • Author(s): Takashi Nakajima, Kento Kawasaki, Akito Noiri, Jun Yoneda, Peter Stano, Tomohiro Otsuka, Kenta Takeda, Matthieu R. Delbecq, Giles Allison, Arne Ludwig, Andreas D. Wieck, Daniel Loss, Seigo Tarucha
  • Organizer: International Conference on Electronic Properties of Two Dimensional Systems
  • Int'l Joint Research
• [Presentation] Four single-spin rabi oscillations in a quadruple quantum dot (2017)
  • Author(s): Takumi Ito, Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Akito Noiri, Giles Allison, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha
  • Organizer: International Conference on Electronic Properties of Two Dimensional Systems
  • Int'l Joint Research
• [Presentation] Microwave induced frequency shift and its quadrature compensation for Si/SiGe spin qubits (2017)
  • Author(s): Kenta Takeda, Jun Yoneda, Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Giles Allison, Jun Kamioka, Takumu Honda, Tetsuo Kodera, Shunri Oda, Yusuke Hoshi, Noritaka Usami, Kohei M. Itoh, Seigo Tarucha
  • Organizer: International Workshop on Silicon Quantum Electronics
  • Int'l Joint Research
• [Presentation] Charge-noise-limited coherence and three-nines fidelity of an enriched Si/SiGe spin qubit (2017)
  • 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, Seigo Tarucha
  • Organizer: International Workshop on Silicon Quantum Electronics
  • Int'l Joint Research
• [Presentation] A controlled-phase gate between spin qubits of different kinds (2017)
  • Author(s): Akito Noiri, Takashi Nakajima, Jun Yoneda, Matthieu R. Delbecq, Peter Stano, Tomohiro Otsuka, Kenta Takeda, Shinichi Amaha, Giles Allison, Kento Kawasaki, Arne Ludwig, Andreas D. Wieck, Daniel Loss, and Seigo Tarucha
  • Organizer: Conference and Workshop on Spin-Based Quantum Information Processing
  • Int'l Joint Research
• [Presentation] An isotopically-enriched silicon spin qubit with >99.9% fidelity and charge-noise-limited coherence (2017)
  • 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: Conference and Workshop on Spin-Based Quantum Information Processing
  • Int'l Joint Research
• [Presentation] Probing Dynamics of Local Electronic States in Nanostructures Utilizing Fast Quantum Dot Probes (2017)
  • 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 Symposium on Fluctuation and Structure out of Equilibrium
  • Int'l Joint Research
• [Remarks] 研究成果報告用個人ページ
  • URL: http://ja.tomootsuka.net