2023 Fiscal Year Research-status Report
Novel photon blockade effects with exceptional points
| Project/Area Number |
22KF0404
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| Allocation Type | Multi-year Fund |
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
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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| Co-Investigator(Kenkyū-buntansha) |
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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| Project Period (FY) |
2023-03-08 – 2025-03-31
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| Keywords | photon blockade / effects / quantum correlations / non-Hermitian strategies / manipulating / quantum correlations |
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| Outline of Annual Research Achievements |
The key idea of this project is investigating new-type photon blockade effects for manipulating quantum correlations with non-Hermitian strategies. Specifically, we have studied:
(i) Backscattering-Immune Photon Blockade (under review in Physical Review Letters; co-corresponding author). We propose how to realize backscattering-immune single-photon blockade by introducing a nanotip near a nonlinear optical cavity. Our work opens a route towards generating and protecting fragile quantum resources with unique applications for robust quantum devices at the single-photon level.
(ii) Quantum nonreciprocity in a non-Hermitian atom-light system (under review in Nature Photonics; co-first author). We find that by exchanging the input and output directions of the same chiral light, bipartite quantum correlations of photons can surprisingly emerge in a highly nonreciprocal way, i.e., the correlations exist only in a chosen direction but none at all in the other direction.
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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
Our research focus on the theoretical studies of photon blockade effects with exceptional points. In FY2022 and FY2023, 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)], as well as backscattering-immune quantum correlations [under review in Physical Review Letters]. These works meet the 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 nonreciprocal quantum correlation in a non-Hermitian system (under review in Nature Photonics).
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| Strategy for Future Research Activity |
We would like to extend our works from single-photon level to multi-photon level. Our works focus on single-photon blockade, while non-Hermitian multi-photon blockade or photon bundle still be unexplored. We plan to study these multi-photon effects in non-Hermitian systems for potential applications in on-chip or integrated photonics.
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| Causes of Carryover |
266 JPY was not used, because it was difficult to make the remaining balance to zero. This amount will be used in FY2024 as a part of the expenses to purcahse some PC related peripheral device.
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