ハイブリッド量子系における非線形現象

2021 年度 実績報告書

• 研究課題/領域番号: 19H00662
• 研究機関: 日本電信電話株式会社NTT物性科学基礎研究所
• 研究代表者: Munro William 日本電信電話株式会社NTT物性科学基礎研究所, 量子科学イノベーション研究部, 上席特別研究員 (50599553)
• 研究分担者: 根本 香絵 沖縄科学技術大学院大学, 量子情報科学・技術ユニット, 教授 (80370104)
• 研究期間 (年度): 2019-04-01 – 2023-03-31
• キーワード: Hybrid Quantum Systems / Quantum Phenomena / Quantum nonlinearity / Superradiance / Quantum Thermodynamics / Quantum Simulation / Quantum Correlations / Quantum Information

研究実績の概要

Our primary focus was on to determine whether quantum collective effects can enhance energy transport through a network of HQS’s. Traditionally energy is passed from node-to-node through the channel. We introduced an alternate approach where our channels are replaced by collective environments and showed how energy at a specific node can migrate to a target node but it is not flowing from node to node. Our initial state is not symmetric with respect to the collective coupling to the reservoirs and so different parts of the quantum wave function decay at different rates. Combining this behavior with superradiant decay, we showed the migration of energy from across the network on much faster timescales than the single spin damping rate. Our approach shows the power of being able to tailor both the system / environment and provides new directions for future quantum technologies. This work was published in PRB Letters.
The second focus was on the exploration of driven HQS for quantum simulation tasks. Here we showed a scheme to perform universal simulation in the low frequency regime using a quantum system with one-dimensional nearest-neighbor coupling that are commonly available in the NISQ era HQS’s. We illustrated two examples from NP complete problems and quantum chemistry simulation. This work was published in PRB.
Finally, we also wrote a perspective article for Applied Physics Letters where we detailed the importance of rigorous establishing the presence of entanglement in HQS composed of several spin ensembles and presented an approach for achieving this.

現在までの達成度 (区分)

2: おおむね順調に進展している

理由

The project is “on track” with all the third-year activities/milestones completed.
- First, we completed using of simulator to explore energy transport using multi ensembles coupled to single/multiple baths. Here one ensemble superradiantly emits while the adjacent one undergoes superabsorption. Such a process allows a new form of energy migration based on symmetry and topology.
- Second, we also completed our work on double nuclear spin relaxation in hybrid quantum hall systems showing our simulator operating in different physical systems from the spin ensemble - superconducting circuit primary approach.
- Third, our simulator was used to explore driven HQS to understand their potential for quantum simulation tasks.
Last all Milestones were completed. Presentation of the work at major international conferences however was delayed due to COVID.

今後の研究の推進方策

Our focus in this last year will be:
A. Investigate whether quantum correlations can be transported via HQS nonlinear effects (much as energy was). The concept is that two ensembles are entangled followed by one ensemble superradiantly emitting to another which super absorbs it. As this is a purely dissipative process can energy migrate in such a way. We also will explore a chain of nodes.
B. We will be to continue our exploration of driven HQS to understand their potential for quantum simulation tasks.
[Milestone 8]: Extend our investigation to include multiple ensembles coupled to the same superconducting resonator where those individual ensemble coupling can be in and out of phase with each other. (Month 42)
[Milestone 9]: Propose novel applications under realistic conditions (Month 48)

研究成果

• [雑誌論文] Stroboscopic Hamiltonian engineering in the low-frequency regime with a one-dimensional quantum processor (2022)
  • 著者名/発表者名: Bastidas V. M.、Haug T.、Gravel C.、Kwek L.-C.、Munro W. J.、Nemoto Kae
  • 雑誌名: Physical Review B 巻: 105 ページ: 1-13
  • DOI: 10.1103/PhysRevB.105.075140
  • 査読あり / 国際共著
• [雑誌論文] Reservoir-assisted energy migration through multiple spin domains (2021)
  • 著者名/発表者名: Dias Josephine、Wachtler Christopher W.、Bastidas Victor M.、Nemoto Kae、Munro William J.
  • 雑誌名: Physical Review B 巻: 104 ページ: 1-6
  • DOI: 10.1103/PhysRevB.104.L140303
  • 査読あり / 国際共著
• [雑誌論文] Perspective on witnessing entanglement in hybrid quantum systems (2021)
  • 著者名/発表者名: Mao Yingqiu、Gong Ming、Nemoto Kae、Munro William J.、Majer Johannes
  • 雑誌名: Applied Physics Letters 巻: 119 ページ: 110501 ～110501
  • DOI: 10.1063/5.0062842
  • 査読あり / 国際共著
• [雑誌論文] Double nuclear spin relaxation in hybrid quantum Hall systems (2021)
  • 著者名/発表者名: Fauzi M. H.、Munro William J.、Nemoto Kae、Hirayama Y.
  • 雑誌名: Physical Review B 巻: 104 ページ: 1-6
  • DOI: 10.1103/PhysRevB.104.L121402
  • 査読あり / 国際共著
• [雑誌論文] Dephasing-induced growth of discrete time-crystalline order in spin networks (2021)
  • 著者名/発表者名: Sakurai Akitada、Bastidas Victor M.、Estarellas Marta P.、Munro William J.、Nemoto Kae
  • 雑誌名: Physical Review B 巻: 104 ページ: 1-9
  • DOI: 10.1103/PhysRevB.104.054304
  • 査読あり / 国際共著
• [学会発表] A stroll through a 62 qubit quantum processor (2022)
  • 著者名/発表者名: W. J. Munro, Ming Gong, Shiyu Wang, Chen Zha, Ming-Cheng Chen, He-Liang Huang, Yulin Wu, Qingling Zhu, Youwei Zhao, ... , Yu Xu, Lihua Sun, Cheng Guo, Na Li, Futian Liang, V. M. Bastidas, Kae Nemoto, Yong-Heng Huo, Chao-Yang Lu, Cheng-Zhi Peng, Xiaobo Zhu, Jian-Wei Pan
  • 学会等名: Photonics West on Demand, San Francisco, USA, 21 - 27 February (2022)
  • 国際学会 / 招待講演
• [学会発表] Quantum Metamorphism (2021)
  • 著者名/発表者名: V. M. Bastidas, M. P. Estarellas, K. Nemoto, W. J. Munro
  • 学会等名: ISNTT 2021, Virtual, Japan, 14-17 Dec (2021)
• [学会発表] Time reversal and error propagation in a periodically-driven superconducting quantum processor (2021)
  • 著者名/発表者名: V. M. Bastidas, C. Zha, M. Gong, Y. Wu, H. Rong, R. Yang, Y. Ye, S. Li, Q. Zhu, S. Wang, Y. Zhao, F. Liang, J. Lin, Y. Xu, C.-Z. Peng, J. Schmiedmayer, Kae Nemoto, H. Deng, W. J. Munro, X. Zhu and J. W. Pan
  • 学会等名: SSDM2021, Virtual, Japan, 06-09 Sept (2021)
  • 国際学会
• [学会発表] Error propagation in a periodically-driven superconducting processor (2021)
  • 著者名/発表者名: V. M. Bastidas, C. Zha, M. Gong, Y. Wu, H. Rong, R. Yang, Y. Ye, S. Li, Q. Zhu, S. Wang, Y. Zhao, F. Liang, J. Lin, Y. Xu, C.-Z. Peng, J. Schmiedmayer, Kae Nemoto, H. Deng, W. J. Munro, X. Zhu and J. W. Pan
  • 学会等名: AQIS2021, Virtual, Japan, 01-04 Sept (2021)
  • 国際学会
• [学会発表] Discrete time crystal growth on phase damping spin networks (2021)
  • 著者名/発表者名: Akitada Sakurai, Victor M. Bastidas, M.P. Estarellas, William. J Munro and Kae Nemoto
  • 学会等名: 2nd GEnKO Freiburg-Asia Workshop, 31st May to 2nd June (2021)
  • 国際学会
• [学会発表] Reservoir-assisted energy migration through multiple spin-domains (2021)
  • 著者名/発表者名: Josephine Dias, Christopher W. Wachtler, Victor M. Bastidas, Kae Nemoto, and William J. Munro
  • 学会等名: AQIS2021, Virtual, Japan, 01-04 Sept (2021)
  • 国際学会
• [図書] Hybrid Quantum Systems (2022)
  • 著者名/発表者名: Yoshiro Hirayama, Koji Ishibashi, Kae Nemoto
  • 総ページ数: 347
  • 出版者: Springer Verlag, Singapore
  • ISBN: 978-981-16-6678-0