| 研究課題/領域番号 |
22F22018
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| 配分区分 | 補助金 |
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| 研究機関 | 国立研究開発法人理化学研究所 |
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研究代表者 |
NORI FRANCO 国立研究開発法人理化学研究所, 開拓研究本部, 主任研究員 (50415262)
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| 研究分担者 |
HUANG RAN 国立研究開発法人理化学研究所, 開拓研究本部, 外国人特別研究員
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| 研究期間 (年度) |
2022-07-27 – 2025-03-31
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| キーワード | photon blockad / non-Hermitian coupling / optical mode / phonon lasers |
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| 研究実績の概要 |
The key idea of this project is investigating novel photon blockade effects with exceptional points (EPs). Specifically, we have studied:
(i) Exceptional photon blockade [Laser & Photonics Reviews 16, 2100430 (2022); first author]. We study photon blockade effects with exceptional points in a microcavity with non-dissipative non-Hermitian coupling between the countercirculating modes. We find that a purely quantum effect, known as single-photon blockade emerges due to EP-induced asymmetric coupling between the optical modes and the nonlinearity-induced anharmonic energy-level spacing.
(ii) Loss-induced photon blockade [Physical Review A 106, 043715 (2022); co-corresponding author]. By harnessing EPs, we find that photon blockade can be revived with the help of loss in a nonlinear optical-molecule system. Also, a quantum switch between single-photon blockade and two-photon blockade can be realized by simply tuning the loss.
(iii) Nonlinear multi-frequency phonon lasers [Nature Physics 19, 414-419 (2023); co-first author]. Phonon laser, as an analog of photon laser, exploits coherent amplifications of phonons. We report a multiple-frequency phonon laser in a levitated optomechanical system with optical gain.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
1Our research focus on the theoretical studies of photon blockade effects with exceptional points. We have explored such novel quantum effect, namely exceptional photon blockade [Laser & Photonics Reviews 16, 2100430 (2022)], and also studied its potential application, i.e., revival of quantum effect with the help of loss, and quantum switch of single- or two-photon devices by tuning loss [Physical Review A 106, 043715 (2022)]. These works meet the short-term goals of this project: to implement novel photon blockade effects with exceptional points in optical cavities, and to improve the performance of single-photon devices in quantum information processing. Moreover, we studied the novel phonon lasing effect, an analog of photon lasing [Nature Physics 19, 414-419 (2023)], in which the optical gain and the measurements of correlation functions may benefit for the experimental realization of exceptional photon blockade.
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| 今後の研究の推進方策 |
We will extend our studies of the photon blockade effect with exceptional points, to quantum effects in non-Hermitian systems. We study the quantum correlations in a non-Hermitian system and find the chirality-induced quantum nonreciprocity of bipartite correlations due to the non-Hermitian atom-light interactions. This work may shed new light on largely unexplored directions by bringing together non-Hermiticity, chirality, nonreciprocity, and Floquet physics, for achieving and tuning one-way multipartite quantum correlations, and enabling new ways for assembling chirality-controlled quantum nonreciprocal devices.
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