2021 Fiscal Year Annual Research Report
Non-linear Phenomena in Hybrid Quantum Systems
| Project/Area Number |
19H00662
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| Research Institution | NTT Basic Research Laboratories |
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Principal Investigator |
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)
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| Co-Investigator(Kenkyū-buntansha) |
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)
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | Hybrid Quantum Systems / Quantum Phenomena / Quantum nonlinearity / Superradiance / Quantum Thermodynamics / Quantum Simulation / Quantum Correlations / Quantum Information |
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| Outline of Annual Research Achievements |
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.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
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.
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| Strategy for Future Research Activity |
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)
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[Presentation] A stroll through a 62 qubit quantum processor2022
Author(s)
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
Organizer
Photonics West on Demand, San Francisco, USA, 21 - 27 February (2022)
Int'l Joint Research / Invited
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[Presentation] Time reversal and error propagation in a periodically-driven superconducting quantum processor2021
Author(s)
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
Organizer
SSDM2021, Virtual, Japan, 06-09 Sept (2021)
Int'l Joint Research
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[Presentation] Error propagation in a periodically-driven superconducting processor2021
Author(s)
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
Organizer
AQIS2021, Virtual, Japan, 01-04 Sept (2021)
Int'l Joint Research
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