Enhancing performance of quantum control techniques for electron spin qubits in silicon quantum dots

• Project/Area Number: 19K14640
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: Noiri Akito 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, 基礎科学特別研究員 (40804042)
• Project Period (FY): 2019-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000); Fiscal Year 2019: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 量子ビット / 量子ドット / 電子スピン

Outline of Research at the Start

高い集積性を有する量子計算機としての可能性が着目されている半導体量子ドット中の電子スピン系では、複数の電子スピンによる様々なサブレベルを量子ビットとして用いることができる。中でも、高い制御性を誇る単一スピン量子ビットと検出に優れる一重項-三重項量子ビットを結合した異種スピン量子ビット複合系は、両方式の利点を融合した効率的なスピン量子計算が可能となる。本研究では、コヒーレンスに優れるシリコン量子ドットで高性能な異種スピン量子ビット複合系を実現し、スピン量子計算の可能性を飛躍的に広げることを目指す。

Outline of Final Research Achievements

We developed device fabrication techniques to fabricate stable and tunable silicon quantum dots with a high yield. We realized a high-fidelity single-qubit control in single electron spin qubits and also demonstrated a single-qubit operation for a singlet-triplet qubit. Then we focused on improving a performance of a two-qubit gate between two single electron spin qubits. We carefully designed the device to make the two-qubit gate faster and as a result, we succeeded in enhancing a two-qubit gate fidelity. Furthermore, we established a new technique to control a two-qubit coupling and drastically enhanced on off ratio of the two-qubit coupling.

Academic Significance and Societal Importance of the Research Achievements

シリコンスピン量子コンピュータでは、量子ビットの種類、2量子ビット操作の実装手法など基本動作においても複数の候補があり、その優位性はいまだ決まっていない。本研究では、異種スピン量子ビット複合系の実現可能性や既存の2量子ビット操作手法における高忠実操作の実現、およびより拡張性に優れる新しい2量子ビット操作手法の開発を行うことで、各手法の性能や相性を明らかにし、今後のシリコンスピン量子コンピュータの開発方針に指針を与えた。

Research Products

• [Journal Article] Real-Time Feedback Control of Charge Sensing for Quantum Dot Qubits (2021)
  • Author(s): Nakajima Takashi、Kojima Yohei、Uehara Yoshihiro、Noiri Akito、Takeda Kenta、Kobayashi Takashi、Tarucha Seigo
  • Journal Title: Physical Review Applied Volume: 15 Issue: 3
  • DOI: 10.1103/physrevapplied.15.l031003
  • Peer Reviewed / Open Access
• [Journal Article] Probabilistic teleportation of a quantum dot spin qubit (2021)
  • Author(s): Y. Kojima, T. Nakajima, A. Noiri, J. Yoneda, T. Otsuka, K. Takeda, S. Li, S. D. Bartlett, A. Ludwig, A. D. Wieck and S. Tarucha
  • Journal Title: npj Quantum Information Volume: - Issue: 1 Pages: 68-68
  • DOI: 10.1038/s41534-021-00403-4
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Quantum tomography of an entangled three-spin state in silicon (2021)
  • Author(s): Kenta Takeda, Akito Noiri, Takashi Nakajima, Jun Yoneda, Takashi Kobayashi, and Seigo Tarucha
  • Journal Title: Nature Nanotechnology Volume: -
  • Peer Reviewed
• [Journal Article] Radio-Frequency-Detected Fast Charge Sensing in Undoped Silicon Quantum Dots (2020)
  • Author(s): Noiri Akito、Takeda Kenta、Yoneda Jun、Nakajima Takashi、Kodera Tetsuo、Tarucha Seigo
  • Journal Title: Nano Letters Volume: 20 Issue: 2 Pages: 947-952
  • DOI: 10.1021/acs.nanolett.9b03847
  • Peer Reviewed
• [Journal Article] Quantum non-demolition readout of an electron spin in silicon (2020)
  • Author(s): Yoneda J.、Takeda K.、Noiri A.、Nakajima T.、Li S.、Kamioka J.、Kodera T.、Tarucha S.
  • Journal Title: Nature Communications Volume: 11 Issue: 1 Pages: 1-7
  • DOI: 10.1038/s41467-020-14818-8
  • Peer Reviewed / Open Access
• [Journal Article] Coherence of a Driven Electron Spin Qubit Actively Decoupled from Quasistatic Noise (2020)
  • Author(s): Nakajima Takashi、Noiri Akito、Kawasaki Kento、Yoneda Jun、Stano Peter、Amaha Shinichi、Otsuka Tomohiro、Takeda Kenta、Delbecq Matthieu R.、Allison Giles、Ludwig Arne、Wieck Andreas D.、Loss Daniel、Tarucha Seigo
  • Journal Title: Physical Review X Volume: 10 Issue: 1 Pages: 011060-011060
  • DOI: 10.1103/physrevx.10.011060
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Resonantly Driven Singlet-Triplet Spin Qubit in Silicon (2020)
  • Author(s): Takeda K.、Noiri A.、Yoneda J.、Nakajima T.、Tarucha S.
  • Journal Title: Physical Review Letters Volume: 124 Issue: 11 Pages: 1-5
  • DOI: 10.1103/physrevlett.124.117701
  • Peer Reviewed
• [Journal Article] Quantum non-demolition measurement of an electron spin qubit (2019)
  • Author(s): Takashi Nakajima, Akito Noiri, 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
  • Journal Title: Nature Nanotechnology Volume: 未定 Issue: 6 Pages: 555-560
  • DOI: 10.1038/s41565-019-0426-x
  • Peer Reviewed / Int'l Joint Research
• [Presentation] シリコン３量子ビットプロセッサー(I) (2021)
  • Author(s): 野入亮人、武田健太、中島峻、米田淳、小林嵩、樽茶清悟
  • Organizer: 日本物理学会
• [Presentation] シリコン３量子ビットプロセッサー(II) (2021)
  • Author(s): 武田健太、 野入亮人、中島峻、米田淳、小林嵩、樽茶清悟
  • Organizer: 日本物理学会
• [Presentation] スピン量子ビットのための電荷計のフィードバック制御 (2021)
  • Author(s): 上原義裕、中島峻、小嶋洋平、野入亮人、武田健太、小林嵩、樽茶清悟
  • Organizer: 日本物理学会
• [Presentation] シリコン量子ドットにおける電子スピン量子非破壊測定 (2020)
  • Author(s): 米田淳、武田健太、野入亮人、中島峻、Sen Li、神岡純、小寺哲夫、樽茶清悟
  • Organizer: 日本物理学会
• [Presentation] Universal behavior of low-dimensional systems on Si and Ge quantum well (2020)
  • Author(s): Yosuke Sato, Xin Liu, Kenta Takeda, Akito Noiri, Takashi Nakajima, Kento Ueda, Sadashige Matsuo, Amir Sammak, Menno Veldhorst, Giordano Scappucci, and Seigo Tarucha
  • Organizer: 第25回半導体におけるスピン工学の基礎と応用
• [Presentation] 高周波反射測定による電界誘起型シリコン量子ドットの高速電荷検出 (2020)
  • Author(s): 野入亮人、武田健太、米田淳、中島峻、小寺哲夫、樽茶清悟
  • Organizer: 日本物理学会
• [Presentation] シリコン・スピン量子ビットに対する測定ベースの決定性初期化プロトコル (2020)
  • Author(s): 小林嵩、米田淳、武田健太、野入亮人、中島峻、樽茶清悟
  • Organizer: 日本物理学会
• [Presentation] Towards quantum teleportation with quantum-dot spin qubits (2019)
  • Author(s): Yohei Kojima, Takashi Nakajima, Akito Noiri, Jun Yoneda, Tomohiro Otsuka, Kenta Takeda, Sen Li, Stephen D. Bartlett, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
  • Organizer: Compound Semiconductor Week 2019
  • Int'l Joint Research
• [Presentation] Quantum non-demolition readout of an electron spin in a Si/SiGe quantum dot (2019)
  • Author(s): Jun Yoneda, Kenta Takeda, Akito Noiri, Takashi Nakajima, Sen Li, Tetsuo Kodera, and Seigo Tarucha
  • Organizer: Silicon Quantum Electronics Workshop 2019
  • Int'l Joint Research
• [Presentation] High-fidelity resonant operation of a Si-based singlet-triplet qubit (2019)
  • Author(s): Kenta Takeda, Akito Noiri, Takashi Nakajima, Jun Yoneda, Sen Li, and Seigo Tarucha
  • Organizer: Silicon Quantum Electronics Workshop 2019
  • Int'l Joint Research
• [Presentation] Coherent electric dipole spin resonance manipulation of three individual spins in a Si/SiGe triple quantum dot (2019)
  • Author(s): Akito Noiri, Kenta Takeda, Takashi Nakajima, Jun Yoneda, Takashi Kobayashi, Sen Li, and Seigo Tarucha
  • Organizer: Silicon Quantum Electronics Workshop 2019
  • Int'l Joint Research
• [Presentation] Deterministic initialization of a Si/SiGe spin qubit (2019)
  • Author(s): Takashi Kobayashi, Jun Yoneda, Kenta Takeda, Akito Noiri, Takashi Nakajima, and Seigo Tarucha
  • Organizer: Silicon Quantum Electronics Workshop 2019
  • Int'l Joint Research
• [Presentation] Measurement-based deterministic initialization of a Si/SiGe spin qubit (2019)
  • Author(s): akashi Kobayashi, Jun Yoneda, Kenta Takeda, Akito Noiri, Takashi Nakajima, and Seigo Tarucha
  • Organizer: EU-USA-Japan International Symposium on Quantum Technology(ISQT)
  • Int'l Joint Research
• [Presentation] Enhancing coherence of a single electron spin by realtime probing of magnetic noise (2019)
  • Author(s): Akito Noiri, Takashi Nakajima, Jun Yoneda, Peter Stano, Tomohiro Otsuka, Kenta Takeda, Daniel Loss, and Seigo Tarucha
  • Organizer: EU-USA-Japan International Symposium on Quantum Technology(ISQT)
  • Int'l Joint Research
• [Presentation] Coherent electric dipole spin resonance manipulation of three individual spins in a Si/SiGe triple quantum dot (2019)
  • Author(s): Kenta Takeda, Akito Noiri, Takashi Nakajima, Jun Yoneda, Takashi Kobayashi, Sen Li, and Seigo Tarucha
  • Organizer: EU-USA-Japan International Symposium on Quantum Technology(ISQT)
  • Int'l Joint Research
• [Presentation] Two-qubit gate control in silicon (2019)
  • Author(s): Akito Noiri, Kenta Takeda, Takashi Nakajima, Takashi Tobayashi, Sen Li, and Seigo Tarucha
  • Organizer: 9th Summer School on Semiconductor/Superconductor Quantum Coherence Effect and Quantum Information
• [Presentation] Quantum teleportation with quantum-dot spin qubits (2019)
  • Author(s): Yohei Kojima, Takashi Nakajima, Akito Noiri, Jun Yoneda, Tomohiro Otsuka, Kenta Takeda, Sen Li, Arne Ludwig, Andreas. D. Wieck and Seigo Tarucha
  • Organizer: 9th Summer School on Semiconductor/Superconductor Quantum Coherence Effect and Quantum Information
• [Presentation] Control and measurement of electron spin states in quadruple quantum dots (2019)
  • 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, and Seigo Tarucha
  • Organizer: 9th Summer School on Semiconductor/Superconductor Quantum Coherence Effect and Quantum Information
• [Presentation] Improvement of the micro-magnet technique in a spin-based quantum computer (2019)
  • Author(s): Yoshihiro Uehara, Yohei Kojima, Takashi Nakajima, Akito Noiri, Kenta Takeda, Takashi Kobayashi, Sen Li, and Seigo Tarucha
  • Organizer: 9th Summer School on Semiconductor/Superconductor Quantum Coherence Effect and Quantum Information
• [Presentation] Determination of the direction of the spin-orbit field in a physically-defined p-type MOS silicon double quantum dot (2019)
  • Author(s): Marian Marx, Jun Yoneda, Angel Gutierrez Rubio, Peter Stano, Kenta Takeda, Yu Yamaoka, Tomohiro Otsuka, Takashi Nakajima, Akito Noiri, Sen Li, Daniel Loss, Tetsuo Kodera, and Seigo Tarucha
  • Organizer: 9th Summer School on Semiconductor/Superconductor Quantum Coherence Effect and Quantum Information
• [Presentation] Flip-chip implementation of cQED (2019)
  • Author(s): Juan Rojas Arias, Takashi Nakajima, Kenta Takeda, Akito Noiri, Takashi Kobayashi, Sen Li, and Seigo Tarucha
  • Organizer: 9th Summer School on Semiconductor/Superconductor Quantum Coherence Effect and Quantum Information
• [Presentation] 4重量子ドットにおける4電子スピン状態測定法の開発 (2019)
  • Author(s): 伊藤匠、大塚朋廣、中島峻、Matthieu Delbecq、天羽真一、米田淳、武田健太、野入亮人、Giles Allison、Arne Ludwig、Andreas D. Wieck、樽茶清悟
  • Organizer: 日本物理学会