| Project/Area Number |
18K13479
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
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| Research Institution | The University of Electro-Communications |
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Principal Investigator |
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | リュードベリ原子 / 光共振器 / 冷却原子 / 単一光子 / 共振器量子電気力学 / Rydberg状態 / Rydberg原子 / 量子光学 |
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| Outline of Final Research Achievements |
In this work, we developed a system that enables us to generate a single collective Rydberg excitation within a cold atomic ensemble trapped inside an optical resonator for high-efficiency, arbitrary-number photon generation. Firstly, we built an ultra-high vacuum chamber, a coil system that enables fast turn-off of quadratic magnetic field, and laser systems for magneto-optical trap. Secondly, we designed an optical resonator for enhancing single-photon emission into a single spatial mode. Thirdly, we built a laser system for two-photon Rydberg excitation and obtained a transmission spectrum of electromagnetically induced transparency, which is used for laser frequency stabilization with respect to the two-photon Rydberg transition.
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| Academic Significance and Societal Importance of the Research Achievements |
量子情報処理技術に関する理論提案においては、しばしば光子数が自在に操れることが前提となっているが、現実的には、任意の数の光子を任意の時刻と空間モードに発生させるという要求は非常に高度なものである。実際、様々な物理系における試みにもかかわらず、任意時刻における特定の空間モードへの高効率な単一光子の発生はほとんど報告されておらず、複数光子を含む光子数状態の発生には、単一光子の発生よりもさらに大きな困難が伴う。しかしながら量子的な光の応用において光子数状態の生成技術の開発は避けて通れない課題であり、本研究はその解決への一つの糸口を与え得るものである。
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