Papers 【 display / non-display 】

Papers 【 display / non-display 】

• Deterministic Bell state measurement with a single quantum memory

  Akira Kamimaki, Keidai Wakamatsu, Kosuke Mikata, Yuhei Sekiguchi, Hideo Kosaka

  npj Quantum Information   9   2023.10  [Reviewed]

  CiNii Research

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  Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Nature   Joint Work  

  Entanglements serve as a resource for any quantum information system and are deterministically generated or swapped by a joint measurement called complete Bell state measurement (BSM). The determinism arises from a quantum nondemolition measurement of two coupled qubits with the help of readout ancilla, which inevitably requires extra physical qubits. We here demonstrate a deterministic and complete BSM with only a nitrogen atom in a nitrogen-vacancy (NV) center in diamond as a quantum memory without relying on any carbon isotopes, which are the extra qubits, by exploiting electron‒nitrogen (14N) double qutrits at a zero magnetic field. The degenerate logical qubits within the subspace of qutrits on the electron and nitrogen spins are holonomically controlled by arbitrarily polarized microwave and radiofrequency pulses via zero-field-split states as the ancilla, thus enabling the complete BSM deterministically. Since the system works under an isotope-free and field-free environment, the demonstration paves the way to realize high-fidelity quantum repeaters for long-haul quantum networks and quantum interfaces for large-scale distributed quantum computers.

• Tunable magnon-magnon coupling in synthetic antiferromagnets

  Sud A., Zollitsch C. W., Kamimaki A., Dion T., Khan S., Iihama S., Mizukami S., Kurebayashi H.

  PHYSICAL REVIEW B   102 ( 10 )   2020.9  [Reviewed]

  DOI Web of Science

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  Language：English   Publishing type：Research paper (scientific journal)   Joint Work  

• Parametric Amplification of Magnons in Synthetic Antiferromagnets

  Kamimaki A., Iihama S., Suzuki K. Z., Yoshinaga N., Mizukami S.

  PHYSICAL REVIEW APPLIED   13 ( 4 )   2020.4  [Reviewed]

  DOI Web of Science

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  Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Joint Work  

• Modular interface for efficient optical readout of diamond quantum memory at cryogenic temperatures via single-mode optical fibers

  Akira Kamimaki, Yuhei Sekiguchi, Daisuke Ito, Taichi Fujiwara, Toshiharu Makino, Hiromitsu Kato, Hi … Show more authors

  arXiv   2025.10

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  Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Single Work  

• Information Processing Capacity of Spintronic Oscillator

  Sumito Tsunegi, Tomoyuki Kubota, Akira Kamimaki, Julie Grollier, Vincent Cros, Kay Yakushiji, Akio … Show more authors

  Advanced Intelligent Systems   2023.6  [Reviewed]

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  Language：English   Publishing type：Research paper (scientific journal)   Single Work  

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Other external funds procured 【 display / non-display 】

Other external funds procured 【 display / non-display 】

• シリコンG中心の光学共鳴励起による高集積量子インターフェースの開拓

  2026.7 - 2028.6

  Private Foundations  研究助成

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  Authorship：Principal investigator 

Presentations 【 display / non-display 】

Presentations 【 display / non-display 】

• ダイヤモンドNV中心を用いた高効率光読み出しとそのデバイス開発, QUARCセミナー

  上牧瑛  [Invited]

  QUARCセミナー  2025.12 

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  Event date： 2025.12

  Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

  Venue：QST高崎  

• ダイヤモンドNV中心を用いた高効率光読み出しとデバイス開発

  上牧 瑛  [Invited]

  応用物理学会スピントロニクス材料研究会  2025.11 

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  Event date： 2025.11

  Language：English   Presentation type：Oral presentation (invited, special)  

  Venue：東北大学片平キャンパス  

• ダイヤモンド窒素空孔中心を用いた高効率光読出し用インターフェースモジュール

  上牧瑛, 関口雄平, 伊藤大輔, 藤原太朔, 牧野俊晴, 加藤宙光, 小坂英男

  第86回応用物理学会秋季学術講演会  2025.9 

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  Event date： 2025.9

  Language：Japanese   Presentation type：Oral presentation (general)  

  Venue：名城大学天白キャンパス  

• Quantum manipulation and creation of a single nitrogen vacancy center for high fidelity quantum repeaters

  Akira Kamimaki  [Invited]

  The 2nd International Workshop of Spin/Quantum Materials and Devices (IWSQMD 2023)  2023.11  Advanced Institute for Materials Research (AIMR), Tohoku University

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  Event date： 2023.11

  Language：English   Presentation type：Oral presentation (invited, special)  

  Venue：Advanced Institute for Materials Research (AIMR), Tohoku University  

• Deterministic Bell-state measurement with a single quantum memory

  A. Kamimaki, K. Wakamatsu, K. Mikata, Y. Sekiguchi, and H. Kosaka

  Ulm-Yokohama Joint workshop  2023.1  Quantum Information Research Center (QIC)

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  Event date： 2023.1

  Language：English   Presentation type：Oral presentation (general)  

  Venue：Online