2013 Fiscal Year Final Research Report
Light-based multi-qubit quantum control
| Project Area | Quantum cybernetics - interdisciplinary studies of quantum controls and developments toward quantum computing |
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| Project/Area Number |
21102008
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | The University of Tokyo (2011-2013)
Osaka University (2009-2010) |
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Principal Investigator |
KOASHI Masato 東京大学, 工学(系)研究科(研究院), 教授 (90322099)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Takashi 大阪大学, 基礎工学研究科, 准教授 (10403130)
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| Co-Investigator(Renkei-kenkyūsha) |
IKUTA Rikizo 大阪大学, 基礎工学研究科, 助教 (90626475)
AZUMA Koji 日本電信電話株式会社NTT物性科学基礎研究所, 量子光物性研究部, 研究員 (90599549)
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| Project Period (FY) |
2009-07-23 – 2014-03-31
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| Keywords | 量子インターフェース / 波長変換 / 量子もつれ / デコヒーレンスフリー部分空間 / Ｗ状態 |
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| Research Abstract |
Among various physical systems, photons play a unique role as the only physical system that can be used as a carrier of quantum information in the communication between two remote parties. We have developed quantum interface to change the wavelength of the photons while preserving quantum properties of light and the quantum information it carries, and achieved a conversion fidelity over 90%. This interfeace is a vital tool for transmitting quantum information stored in various physical systems to a remote place through telecom fibers. We have also developed a very efficient method of protecting quantum information from noises in communication channels. Our experimental demonstration has shown that the new method achieves an efficency two orders of magunitude higher than the conventional method.
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