2020 Fiscal Year Final Research Report
Broadcast continuous variable quantum key distribution
| Project/Area Number |
18H01157
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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 | National Institute of Information and Communications Technology |
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Principal Investigator |
Takeoka Masahiro 国立研究開発法人情報通信研究機構, 未来ICT研究所量子ICT先端開発センター, センター長 (70415850)
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| Co-Investigator(Kenkyū-buntansha) |
平野 琢也 学習院大学, 理学部, 教授 (00251330)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Keywords | 連続量量子鍵配送 / ブロードキャスト通信路 / 波長多重量子鍵配送 |
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| Outline of Final Research Achievements |
We propose a novel network-type quantum key distribution (QKD) where one sender and multiple receivers are connected via a broadcast channel and the total key rate can be increased by collaborative operation among the sender and the receivers. We implement this “broadcast-QKD” in the lab and performed its proof-of-principle experiment. We also pursued more general framework and technologies for the network based QKD and related quantum security protocols. We derive key rate increases of the continuous variable QKD (CVQKD) under the limited attack by eavesdroppers and also develop and demonstrate the wavelength multiplexing of CVQKDs and ultrahigh-speed optical communication.
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| Free Research Field |
量子情報理論、量子暗号
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| Academic Significance and Societal Importance of the Research Achievements |
ブロードキャスト型QKDは本研究グループ独自の理論に基づく方式であり、その実装にいち早く取り組み原理実証を行ったことは学術的に高い意義があると考える。また、本方式がベースとしている１対１の連続量量子鍵配送（CVQKD）方式そのものは、近い将来の実用化が期待されるQKD方式であるが、実用上重要となる光通信との波長多重化や、QKD自身の波長多重化の設計と原理実証に成功したことは社会的に高い意義があると考える。
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