Many-body quantum systems developed by quantum measurements
| Project/Area Number |
16H02214
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Atomic/Molecular/Quantum electronics
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| Research Institution | Osaka University |
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Principal Investigator |
Imoto Nobuyuki 大阪大学, 理学研究科, 招へい研究員 (00313479)
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| Co-Investigator(Kenkyū-buntansha) |
早坂 和弘 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, 研究マネージャー (10359086)
山本 俊 大阪大学, 基礎工学研究科, 教授 (10403130)
三木 茂人 国立研究開発法人情報通信研究機構, 未来ICT研究所フロンティア創造総合研究室, 主任研究員 (30398424)
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| Research Collaborator |
IKUTA RIKIZO
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥46,540,000 (Direct Cost: ¥35,800,000、Indirect Cost: ¥10,740,000)
Fiscal Year 2018: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Fiscal Year 2017: ¥13,910,000 (Direct Cost: ¥10,700,000、Indirect Cost: ¥3,210,000)
Fiscal Year 2016: ¥19,240,000 (Direct Cost: ¥14,800,000、Indirect Cost: ¥4,440,000)
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| Keywords | 量子情報 / 量子測定 / 量子テレポーテーション / 光量子情報処理 / 超伝導光子検出器 / イオントラップ / 量子周波数変換 / 原子トラップ / 量子光学 / 量子エレクトロニクス / 量子情報処理 / 弱値 / 量子光工学 / 超伝導素子 / 量子通信 / 光通信 / エンタングルメント / 多体量子系 / 波長変換 / 超伝導光検出器 |
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| Outline of Final Research Achievements |
Many-body quantum state generation, control and evaluation were performed in a novel way using the back-action of quantum measurement on the system. (1) Read/Write of quantum memory using single photon detector with frequency conversion, (2) asynchronous multi-photon interference using superconducting photon detector having high time-resolution, and (3) suggestion and demonstration of new use of "weak value." In concrete, (1) a near-visible infrared photon emitted from Rb atoms or a Ca ion is converted to a telecom photon keeping its quantum state, and is read out after telecom photon propagation, (2) the two-photon interference was observed without synchronized photons but with asynchronous photons source, and, (3) we propose a new usage of the weak value and experimentally demonstrate it: The weak value of a photon is an indicator of "the direction and magnitude of the effective influence of an operation applied to that photon."
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| Academic Significance and Societal Importance of the Research Achievements |
ダイナミクスを使う従来方法でなく「量子観測の反作用」を使って多体系の量子状態の生成・制御・評価を行ったことは学術的に新奇であるだけでなく、得られる効果が通常の方法で得られない域に達している。テクノロジー的には、(1)必ず必要となる「量子状態を変えない波長変換」を用い、固定量子ビットの代表である量子メモリと飛行型量子ビットの代表である光子の波長不整合を解消したこと、また(2)高時間分解超伝導光子検出器で事後に選択することにより「長距離通信に向かない同期光子パルス」を不要としたこと、そして(3)新概念「弱値」の新しい使い道を提案実証したことである。これらにより今後の技術革新に資する結果が得られた。
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Report
(4 results)
Research Products
(94 results)
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[Journal Article] High visibility Hong-Ou-Mandel interference via a time-resolved coincidence measurement2017
Author(s)
Yoshiaki Tsujimoto, Yukihiro Sugiura, Motoki Tanaka, Rikizo Ikuta, Shigehito Miki, Taro Yamashita, Hirotaka Terai, Mikio Fujiwara, Takashi Yamamoto, Masato Koashi, Masahide Sasaki, Nobuyuki Imoto
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Journal Title
Optics Express
Volume: 25
Issue: 11
Pages: 12069-12080
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Anomalous time delays and quantum weak measurements in optical micro-resonators2016
Author(s)
Motoki Asano, Konstantin Y. Bliokh, Yury P. Bliokh, Abraham G. Kofman, Rikizo Ikuta, Takashi Yamamoto, Yuri S. Kivshar, Lan Yang, Nobuyuki Imoto, Sahin Kaya Ozdemir, Franco Nori
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Journal Title
Nature Communications
Volume: 7
Issue: 1
Pages: 13488-13488
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
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[Presentation] Polarization insensitive frequency conversion for an atom-photon entanglement distribution via a telecom network2018
Author(s)
生田力三, 小林俊輝, 川上哲生, 三木茂人, 藪野正裕, 山下太郎, 寺井弘高, 小芦雅斗, 向井哲哉, 山本俊, 井元信之
Organizer
第38回量子情報技術研究会
Related Report
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[Presentation] Frequency-qubit manipulation of photons2017
Author(s)
N. Imoto
Organizer
Advances in Foundations of Quantum Mechanics and Quantum Technologies with atoms and photons (Quantum 2017), 8-12 May, 2017 (presented on 9 May), University of Torino, Turin, Italy.
Related Report
Int'l Joint Research / Invited
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