| 研究課題/領域番号 |
23KF0293
|
|---|
| 研究種目 |
特別研究員奨励費
|
| 配分区分 | 基金 |
|---|
| 応募区分 | 外国 |
|---|
| 審査区分 |
小区分13010:数理物理および物性基礎関連
|
|---|
| 研究機関 | 国立研究開発法人理化学研究所 |
|---|
研究代表者 |
NORI FRANCO 国立研究開発法人理化学研究所, 量子コンピュータ研究センター, チームリーダー (50415262)
|
|---|
| 研究分担者 |
MENCZEL PAUL 国立研究開発法人理化学研究所, 量子コンピュータ研究センター, 外国人特別研究員
|
|---|
| 研究期間 (年度) |
2023-11-15 – 2026-03-31
|
| 研究課題ステータス |
交付 (2023年度)
|
| 配分額 *注記 |
2,000千円 (直接経費: 2,000千円)
2025年度: 600千円 (直接経費: 600千円)
2024年度: 1,000千円 (直接経費: 1,000千円)
2023年度: 400千円 (直接経費: 400千円)
|
|---|
| キーワード | QuTiP / dissipative state / quantum jump / trajectories |
|---|
| 研究開始時の研究の概要 |
We first focus on the pseudomode technique, where the degrees of freedom of the open system's environment are separated into strongly interacting components and a residual, weakly coupled environment.
In the second part of this project, we plan to investigate the thermodynamics of quantum devices more closely.
We will then be able to apply the previously developed methods to a range of further applications including shortcut-to-adiabaticity protocols, the use of machine-learning techniques to simplify non-Markovian environments, or the investigation of quantum phase transitions.
|
| 研究実績の概要 |
In FY 2023, we have started our research according to the submitted research plan. Some of our first achievements were based on results regarding the generalized pseudomode technique that were obtained in an earlier short-term JSPS fellowship. For example, we have studied multi-time correlation functions and interaction observables in strongly coupled open quantum systems using pseudomodes, and we have investigated the relationship between pseudomodes and dissipatons. These results were included in publication [1], which also contains the main results of the earlier fellowship. We were also able to successfully apply ideas from the pseudomode technique to the problem of dissipative state engineering, see publication [2]. Further, we have started our work on the statistics of quantum jump trajectories, focusing on an equivalence between the jump-time ensemble and the full-counting statistics of the process, and are currently preparing our first manuscript related to this topic.
In addition, we have presented our preliminary results at multiple occasions, including a workshop in Tainan, Taiwan, and we have continually been working on supporting and improving the QuTiP software package which is used not only by ourselves but all around the world for the easy and efficient simulation of open quantum dynamics.
|
| 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 work is progressing as it was scheduled.
In our research plan, we proposed 4 major tasks. In our work so far, we have started attacking three of these major tasks.
Regarding the first task (“heat flow and fluctuations”), we have shown that the pseudomode framework is a suitable tool for the study of fluctuations in strongly coupled open quantum systems through their multi-time correlation functions. We have also started investigating general theoretical tools for the study of the heat flow and fluctuations in stochastic processes in general, and in open quantum systems in particular.
Regarding the third task (“beyond harmonic pseudomodes”), we have identified dissipatons as an example of generalized pseudomodes that go beyond the usual framework of harmonic pseudomodes.
Regarding the fourth task (“further goals”), we have applied our framework to dissipative state engineering, and we have started studying quantum phase transition first at weak coupling, using the illustrative example of the Su-Schrieffer-Heeger(SSH) This research is still in its early stages.
|
| 今後の研究の推進方策 |
We are planning to continue our work following the submitted research plan. The next steps are to finish our studies of the statistics of quantum jump trajectories and apply it to the SSH model. We will then move back to strongly coupled open quantum systems and try to understand its fluctuations using the pseudomode framework. Beyond that, we intend to apply our theoretical results to practical examples that could be studied in the lab, we will continue to try generalizing our pseudomode framework even further, and we will explore further applications such as the implementation of shortcut-to-adiabaticity protocols in the strong-coupling regime.
Further applications might also be found through interaction with other researchers in Japan and around the world. For this reason, we intend to present our results at multiple occasions in the upcoming months, including a workshop in Kyoto, a large international conference in the United States, and the upcoming annual meeting of the Physical Society of Japan.
|
