2020 Fiscal Year Final Research Report
Storage and release of optical quantum entangled states using concatenated cavity system
| Project/Area Number |
18H01149
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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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 Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Keywords | 量子エンタングルメント / 光子 / 量子メモリー |
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| Outline of Final Research Achievements |
We extend quantum memories composed of concatenated optical cavities, which are our original technique. We create and store a single photon straddling between two memory systems as an entangled state, and release it with controlled timings. We estimate the released quantum state and verify that they are controlled while keeping unique features of quantum mechanics. In particular, negative regions of the Wigner functions are important, distinguishing quantum mechanics from classical mechanics, and the important thing is that the quantum states are stored while keeping this negative regions.
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| Free Research Field |
量子光学実験
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| Academic Significance and Societal Importance of the Research Achievements |
量子力学の応用としての量子コンピューターが注目を集める中で、光という量子系の可能性を広げる意味で、光の特殊な量子状態のタイミング制御を行うという重要な研究に成功した。単なる光子のタイミング制御ではなく、光の位相に敏感な量子状態を扱い、複数台の光共振器メモリーを位相同期できている点が重要である。これは、時間領域多重された光波束の巨大エンタングルメントと組み合わせることで、原理的にはユニバーサルな量子コンピューターの実現につながるものである。
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