2023 Fiscal Year Final Research Report
Group-velocity-mismatched optical Kerr effect in optical fiber toward deterministic single-photon switching
| Project/Area Number |
21K18902
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 30:Applied physics and engineering and related fields
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
BAEK SOYOUNG 東北大学, 電気通信研究所, 助教 (70826172)
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| Project Period (FY) |
2021-07-09 – 2024-03-31
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| Keywords | 光子 / 光スイッチ / 量子光学 |
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| Outline of Final Research Achievements |
We first performed the characterization of a standard optical fiber cable at the wavelengths of 1550 nm and 1300 nm. We observed that a generation probability of a noise photon per gate pulse (at 1550 nm) is 10^-7 and polarization rotation in the fiber is correctable by additional polarization optics. This indicates that the our proposed group-velocity-mismatched Kerr effect in a optical fiber is a promising method for demonstrating low-noise and low-loss polarization switching of single photons. We expect that single-photon polarization switching will be demonstrated in our laboratory after amplifying the gate optical pulses from our laser source.
In the project, we have also demonstrated the design method of the generation of high-purity single photons at 1300 nm and low-loss polarization-maintaining electro-optic router compatible with single photons. Those will be a fundamental components for future photonic quantum information applications.
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| Free Research Field |
量子光学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では、将来の量子情報技術の大規模化、多チャンネル化において重要技術となる、高速、高精度、低損失な単一光子のスイッチングの実現を目標として光ファイバーによる群速度不整合カー効果に基づく単一光子スイッチングの研究を実施した。光ファイバーの古典光学的な評価により、十分なゲートパルスエネルギーによって群速度不整合カー効果の観測は可能であることが明らかになった。また、電気光学スイッチにおいて、新たな干渉計や電気光学素子の構成、配置を考案し、任意偏光を維持する単一光子スイッチの実現に成功した。以上の成果は光子やその偏光を量子情報担体として利用する通信システムの大規模化に貢献することが期待される。
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