KOSAKA Hideo

Affiliation

Faculty of Engineering, Division of Intelligent Systems Engineering

Job Title

Professor

Research Fields, Keywords

quantum information physics, 光子, 電子スピン, 量子テレポーテーション, 量子中継, 量子転写


ORCID  https://orcid.org/0000-0002-3778-7236

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Education 【 display / non-display 】

  • 　
    -
    1999.9

    Kyoto University   Doctor Course   Completed

  • 1987.4
    -
    1989.3

    Kyoto University   Master Course   Completed

  • 1983.4
    -
    1987.3

    Kyoto University   Graduated

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Degree 【 display / non-display 】

  • Doctor of Engineering - Kyoto University

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Campus Career 【 display / non-display 】

  • 2014.4
    　
    　

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Intelligent Systems Engineering   Professor  

  • 2020.10
    　
    　

    Concurrently   Yokohama National UniversityInstitute of Advanced Sciences   Professor  

  • 2018.4
    　
    　

    Concurrently   Yokohama National UniversityGraduate school of Engineering Science   Department of Mathematics, Physics, Electrical Engineering and Computer Science   Professor  

  • 2014.4
    　
    　

    Concurrently   Yokohama National UniversityCollege of Engineering Science   Department of Mathematics, Physics, Electrical Engineering and Computer Science   Professor  

  • 2014.4
    　
    　

    Concurrently   Yokohama National UniversityGraduate School of Engineering   Department o Physics, Electrical and Computer Engineering   Professor  

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External Career 【 display / non-display 】

  • 2003.7
    -
    2014.3

     

  • 1989.4
    -
    2003.6

     

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Academic Society Affiliations 【 display / non-display 】

  • 2000
    　
    　
     

    応用物理学会

  • 2000
    　
    　
     

    日本物理学会

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Research Areas 【 display / non-display 】

  • Natural Science / Semiconductors, optical properties of condensed matter and atomic physics

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Research Career 【 display / non-display 】

  • 量子もつれ中継技術の研究開発／遠隔ノード間での量子もつれ純粋化技術／ハイブリッド量子中継器へ向けた研究開発

    Project Year：

  • 量子ドットにおける単一光子から単一電子スピンへの量子状態転写

    Project Year：

  • 量子もつれ中継技術の研究開発／超伝導技術に基づく多ビット量子もつれ制御と光インターフェース技術／量子中継ノードにおける量子演算回路と量子トランスデューサの研究開発

    Project Year：

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Books 【 display / non-display 】

  • 科学雑誌Newton「“量子時代”のかぎをにぎる もつれる量子」

    小坂英男（ Role： Supervisor (editorial)）

    株式会社ニュートンプレス 

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    Responsible for pages：14-43   Language：Japanese Book type：Scholarly book

  • 大図鑑シリーズ 量子論大図鑑

    小坂英男（ Role： Contributor ,  「第8章 もっと知りたい！量子テレポーテーション・量子暗号」）

    ニュートンプレス  （ ISBN:978-4-315-52714-8 ）

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    Total pages：208   Responsible for pages：180-200   Language：English Book type：Scholarly book

  • 量子技術の実用化と研究開発業務への導入方法

    小坂英男（ Role： Joint author ,  第2章 第7節 量子コンピュータネットワーク、量子中継、量子インターネット開発の現状と今後の展望）

    技術情報協会  （ ISBN:978-4-86104-966-8 ）

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    Language：Japanese Book type：Scholarly book

  • 科学雑誌Newton別冊『量子論のすべて 改訂第2版』

    小坂英男（ Role： Contributor ,  第４章 もっと知りたい！量子論）

    株式会社ニュートンプレス  （ ISBN:978-4-315-52393-5 ）

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    Total pages：176   Responsible for pages：148-161   Language：Japanese Book type：Other

  • 日経エレクトロニクス2021年6月号「突発、量子ネット大戦」

    小坂英男（単著）（ Role： Contributor ,  最大の難所は量子中継 有力候補は“ダイアモンド”）

    日経BP社 

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    Responsible for pages：54-63   Language：Japanese Book type：Other

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Thesis for a degree 【 display / non-display 】

  • 面発光機能素子の開発とその応用に関する研究

    小坂　英男

    1999.9

    Doctoral Thesis   Single Work  

    DOI

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    京都大学　大学院　工学研究科　電子物性工学専攻
    コンピュータのネットワーク化、並列処理化に伴い、データ伝送の大容量化が望まれている。垂直共振器型面発光レーザ（ＶＣＳＥＬ）は面に垂直方向に発光するため、現状の端面発光レーザに対して二次元集積性に優れ、大容量データの並列伝送を可能とする技術として期待されている。本研究ではＶＣＳＥＬの利点を生かして実用化するために駆動電圧上昇の問題をメサ光閉じ込め構造の導入により克服し、光情報処理に必要な発光、受光、スイッチ、メモリ、光増幅機能を集積一体化した面発光機能素子を実現した。また、並列データ伝送への応用を目指した２次元ＶＣＳＥＬ伝送モジュールとその並列性を生かしたＶＣＳＥＬ光スイッチの開発を行った。

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Papers 【 display / non-display 】

  • Electrochemical Deposition of Indium for Scalable 3D Quantum Chiplets

    J. A. Goundar, L. T. Ngoc Mai, M. Yuki, O. Yugi, H. Kosaka and F. Inoue

    2024 International 3D Systems Integration Conference (3DIC), Sendai, Japan   2025.1  [Reviewed]

    DOI

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

  • Coherent Electric-Field Control of Orbital State in a Neutral Nitrogen-Vacancy Center

    Hodaka Kurokawa, Keidai Wakamatsu, Shintaro Nakazato, Toshiharu Makino, Hiromitsu Kato, Yuhei Sekig … Show more authors

    Nature Communications   15 ( 1 )   2024.5  [Reviewed]

    DOI Web of Science PubMed

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

  • Coherent electric field control of orbital state of a neutral nitrogen-vacancy center

    Kurokawa Hodaka, Wakamatsu Keidai, Nakazato Shintaro, Makino Toshiharu, Kato Hiromitsu, Sekiguchi Y … Show more authors

    Nature Communications   15   2024.5

    CiNii Research

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

    The coherent control of the orbital state is crucial for realizing the extremely-low power manipulation of the color centers in diamonds. Herein, a neutrally-charged nitrogen-vacancy center, NV0, is proposed as an ideal system for orbital control using electric fields. The electric susceptibility in the ground state of NV0 is estimated, and found to be comparable to that in the excited state of NV−. Also, the coherent control of the orbital states of NV0 is demonstrated. The required power for orbital control is three orders of magnitude smaller than that for spin control, highlighting the potential for interfacing a superconducting qubit operated in a dilution refrigerator.

  • Low-Temperature Characteristics of an AlN/Diamond surface acoustic wave resonator

    Moyuki Yamamoto, Hodaka Kurokawa, Satoshi Fujii, Toshiharu Makino, Hiromitsu Kato, and Hideo Kosaka

    Journal of Applied Physics   134 ( 21 )   2023.12  [Reviewed]

    DOI Web of Science CiNii Research

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Institute of Physics   Single Work  

    Phonons confined in mechanical resonators can be coupled to a variety of quantum systems and are expected to be applied to hybrid quantum systems. Diamond surface acoustic wave (SAW) devices are capable of high efficiency in phonon interaction with color centers in diamond. The temperature dependence of the quality factor is crucial for inferring the governing mechanism of coupling efficiency between phonons and color centers in diamond. In this paper, we report on the temperature dependence of the quality factor of an AlN/diamond SAW device from room temperature to 5 K. The temperature dependence of the quality factor and resonant frequency suggests that the mechanism of SAW dissipation in the AlN/diamond SAW resonator at 5 GHz is the phonon–phonon scattering in the Akheiser regime and that further cooling can be expected to improve the quality factor. This result provides a crucial guideline for the future design of AlN/diamond SAW devices.

  • Deterministic Bell state measurement with a single quantum memory

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

    npj Quantum Information   9   2023.10

    CiNii Research

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    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.

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Review Papers 【 display / non-display 】

  • Quantum teleportation-based state transfer of photon polarization into a carbon spin in diamond

    Kazuya Tsurumoto and Ryota Kuroiwa and Hiroki Kano and Yuhei Sekiguchi and Hideo Kosaka

    Communications Physics   2 ( 1 )   2019.12

    DOI

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher：Springer Science and Business Media {LLC}   Joint Work  

  • 別冊「量子論のすべて 新訂版」

    Hideo Kosaka、Yuhei Sekiguchi, Hiromitsu Kato, Tokuyuki Teraji,

    Newton   2019.9

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Joint Work  

  • 量子の世界 第4回 量子テレポーテーション

    科学雑誌 Newton   ( 6月 )   58 - 71   2018.5

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

  • 量子情報の視点でダイヤモンドを眺めると?

    量子情報の視点でダイヤモンドを眺めると?   ( 6 )   2017.11

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Single Work  

  • ダイヤモンドで、次世代量子通信の普及を目指す

    Top Researchers   2017.11

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Single Work  

    Other Link： http://top-researchers.com/?p=1125

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Awards 【 display / non-display 】

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Presentations 【 display / non-display 】

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Charge of on-campus class subject 【 display / non-display 】

  • 2025   Quantum Information Physics

    Interfaculty Graduate School of Innovative and Practical Studies

  • 2025   Advanced Quantum Information Physics

    Graduate school of Engineering Science

  • 2025   Quantum Information Physics

    Graduate school of Engineering Science

  • 2025   Electromagnetism 1

    College of Engineering Science

  • 2025   Quantum and Optical Physics

    College of Engineering Science

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Committee Memberships 【 display / non-display 】

  • 量子インターネットタスクフォース　アドバイザリーボード

    2019.5 

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    Committee type：Academic society 

    https://qitf.org/

  • 内閣府　量子技術イノベーション戦略　有識者

    2019.4  有識者

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    Committee type：Academic society 

    https://www.kantei.go.jp/jp/singi/ryoshigijutsu_innovation/index.html

  • 文部科学省　光・量子飛躍フラッグシッププログラム（Q-LEAP）

    2018.5  光・量子飛躍フラッグシッププログラム（Q-LEAP）アドバイザリーボードメンバー

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    Committee type：Government 

  • 横浜国立大学　先端科学高等研究院

    2018.5  主任研究員

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    Committee type：Other 

    先端科学高等研究院主任研究者, 2018年5月1日～現在

  • 先端科学高等研究院

    2018.5  主任研究者

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    Committee type：Academic society 

    http://ias.ynu.ac.jp/

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Social Contribution(Extension lecture) 【 display / non-display 】

  • NICT Quantum Camp(NQC)　招待講演

    Role(s)： Lecturer

    「量子コンピュータ」「量子通信」の次に来る、「量子中継ネットワーク」  2024.9

  • University of Stuttgart（独）との共同研究契約となる協力覚書（Memorandum of Collaboration, MOC）を締結

    Role(s)： Other

    2024.8

  • 科学雑誌Newton「“量子時代”のかぎをにぎる もつれる量子」（2024年10月号）の監修

    Role(s)： Other

    2024.8

  • 先端科学高等研究院と理化学研究所量子コンピュータ研究センターとの間で連携協定を締結

    Role(s)： Other

    横浜国立大学先端科学高等研究院、理化学研究所  https://www.ynu.ac.jp/hus/koho/32023/detail.html  2024.7

  • 36th International Conference on the Physics of Semiconductors 2024

    Role(s)： Lecturer

    Diamond Spin Qubits for Quantum Communication and Computing  2024.7

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Media Coverage 【 display / non-display 】

  • 「もつれる量子　離れていても、絡みあう」Newton×朝日新聞

    朝日新聞デジタル  2024.8

  • 横浜国立大学 先端科学高等研究院と理化学研究所 量子コンピュータ研究センターが連携し、量子未来社会実現のための研究を加速

    日経クロステック  2024.7

  • 先端科学高等研究院と理化学研究所 量子コンピュータ研究センターが連携

    横浜国立大学プレスリリース  2024.7

  • 超伝導光デバイス開発に挑戦 電子デバイスへ3次元実装が肝

    電子デバイス産業新聞  2024.4

  • Ushering in a new era in computing～The key components needed for universal quantum computers are being developed in three major projects in Japan.

    Nature（Volume 626 Issue 8001）  2024.2

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