| 研究課題/領域番号 |
19H00662
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| 研究機関 | 日本電信電話株式会社NTT物性科学基礎研究所 |
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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)
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| 研究分担者 |
根本 香絵 国立情報学研究所, 情報学プリンシプル研究系, 教授 (80370104)
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| 研究期間 (年度) |
2019-04-01 – 2023-03-31
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| キーワード | Hybrid Quantum Systems / Nonlinear phenomena / Superradiance / Quantum Correlations / Quantum Information / Quantum Computation / Quantum Thermodynamics |
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| 研究実績の概要 |
The first year of the project concentrated on two critical aspects:
- First was the development of a quantum simulator able to handle large number of qubits. The simulator included individual qubit thermalization and dephasing as well as collective relaxation. It was used to reproduce the experimental results observed in [Nature Physics 14,1168 (2018)] with good agreement. The simulator was then applied to model two spin ensembles coupled ot the same bath to determine the effects on individual dephasing of it. We applied it to explore the dynamics of a double domain nuclear spin ensemble coupled to the Nambu-Goldstone boson in GaAs semiconductors. Our model predicted superradiance should be observable; quite a surprising result. We are now discussing these results with an experimental group within Japan.
- The second task was an exploration of nonlinear phenomena that potentially could be observed in these hybrid quantum systems. There were several candidates including superradiance and super absorption that can be combined to give true quantum behavior. This gives an indication that the syetm could be used for a quantum battery. Further we found that HQS with a collective drive exhibits highly nonlinear behavior. This behavior can be seen using graph theoretical techniques. We found that we could use these driven HQS’s to simulate the properties of complex networks. Our simulator was able explore the dynamics of such systems.
Several talks (including invited) were given on our preliminary results as well as several papers being readied for publication.
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| 現在までの達成度 (区分) |
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 first-year activities now completed. More specifically we:
- Designed and developed a HQS simulator to explore nonlinear phenomena that also included individual qubit thermalization and dephasing as well as collective relaxation. This was used to reproduce the experimental results observed in [Nature Physics 14,1168 (2018)] with good agreement. It showed the simulator was working as expected. Next the simulator design meant that nonlinear phenomena in quantum systems composed of distinct subsystems could be explored. Porting of this simulator has started to a cluster environment. Further a simple simulator was written to explore what types of nonlinear phenomena that be expected in this hybrid quantum systems involving ensembles of atoms coupled to superconducting circuits
- Second a number of nonlinear phenomena were identified including superradiance and super absorption. In addition the use of periodic drives to structured HQS showed that complex quantum networks could be formed. This will be investigated further in the second year.
Last both Milestones were completed.
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| 今後の研究の推進方策 |
During the second year of the project, we will use the model and simulator developed in the first year to model several HQS systems (including those involving electron and nuclear spin ensembles). In particular we will: 1) Explore HQS possessing quite distinct timescales (eg dephasing much faster than relaxation). 2) Explore various novel applications of hybrid quantum systems for applications that sit outside of the typical computation, communication, and sensing regimes. One of particular interest are quantum battery (which have significantly enhanced charging rate compared to the slow energy release for usage). We will investigate the role of quantum correlations in this enhancement (rather than coherent effects)
There are three milestones for the second year
[M1]: Demonstration of simulator on high performance cluster (Month 18)
[M2]: Exploration of superradiance over short time scales (Month 24)
[M3]: Exploration of quantum battery as a potential application (Month 24)
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