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Affiliation |
Institute of Advanced Sciences |
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Job Title |
Specially Appointed Assistant Professor |
KUROKAWA Hodaka
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Degree 【 display / non-display 】
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Doctor of Philosophy - The University of Tokyo
Campus Career 【 display / non-display 】
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2021.4
Duty Yokohama National UniversityInstitute of Advanced Sciences Specially Appointed Assistant Professor
Papers 【 display / non-display 】
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Quantum Orbital-State Control of a Neutral Nitrogen-Vacancy Center at Millikelvin Temperatures
Hodaka Kurokawa, Shintaro Nakazato, Toshiharu Makino, Hiromitsu Kato, Shinobu Onoda, Yuhei Sekiguch … Show more authors
Hodaka Kurokawa, Shintaro Nakazato, Toshiharu Makino, Hiromitsu Kato, Shinobu Onoda, Yuhei Sekiguchi, and Hideo Kosaka Hide authors
Physical Review Letters 2025.7 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Single Work
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Coherent electric field control of orbital state of a neutral nitrogen-vacancy center
Kurokawa, H; Wakamatsu, K; Nakazato, S; Makino, T; Kato, H; Sekiguchi, Y; Kosaka, H
NATURE COMMUNICATIONS 15 ( 1 ) 2024.5
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Low-temperature characteristics of an AlN/Diamond surface acoustic wave resonator
Yamamoto, M; Kurokawa, H; Fujii, S; Makino, T; Kato, H; Kosaka, H
JOURNAL OF APPLIED PHYSICS 134 ( 21 ) 2023.12
DOI Web of Science CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：American Institute of Physics Joint 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.
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Kim, B; Kurokawa, H; Sakai, K; Koshino, K; Kosaka, H; Nomura, M
PHYSICAL REVIEW APPLIED 20 ( 4 ) 2023.10
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Kim Byunggi, Kurokawa Hodaka, Sakai Katsuta, Kosaka Hideo, Nomura Masahiro
PHYSICAL REVIEW APPLIED 20 ( 4 ) 2023.10
Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society Joint Work
Quantum transduction between microwave and optical photons plays a key role in quantum communication among remote qubits. Although the quantum transduction schemes generating communication photons have been successfully demonstrated by using optomechanical interfaces, the low conversion efficiency remains an obstacle to the implementation of a quantum network consisting of multiple qubits. Here, we present an efficient quantum transduction scheme using a one-dimensional diamond optomechanical crystal cavity tuned at a color-center emission without optomechanical coupling. The optomechanical crystal cavity incorporates a thin aluminum nitride (AlN) pad piezoelectric coupler near the concentrator cavity region, while retaining ultrasmall mechanical and optical mode volumes of about 1.5×10^−4(Λp)^3 and 0.2(λ/n)^3, respectively. The energy level of a coherent color-center electron is manipulated by a strong mechanical-mode–color-center electron-coupling rate up to 16.4 MHz. In our system, we theoretically predict that the population-conversion efficiency from a single microwave photon into an optical photon can reach 15% combined with current technologies. The coherent conversion efficiency is over 10% with a reasonably pure decay time of T^∗2>10ns. Our results imply that an atomic color center strongly coupled to the optomechanical crystal cavity will offer a highly efficient quantum transduction platform.
Presentations 【 display / non-display 】
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量子光電融合を担うマイクロ波―光量子インターフェース
黒川穂高, 佐藤清貴, 小林拓海, 廣津留蓮斗, 山本萌生, 石田悟己, 松清秀次, Natthajuks Pholsen, 西岡政雄, 飯島航大, 池尙玟, 大槻秀夫, 鎌田幹也, 羽中田祥司, 高木佳寿代, 牧野俊晴, Michele Diego, キムビョンギ, 上牧瑛, 関口雄平, 加藤宙光, 寺井弘高, 越野和樹, 小野田忍, 野村政宏, 岩本敏, 馬場俊彦, 小坂英男 [Invited]
第72回応用物理学会春季学術講演会 日本応用物理学会
Event date： 2025.3
Language：Japanese Presentation type：Oral presentation (general)
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量子インターフェースの実現に向けたダイヤモンド色中心の研究
黒川 穂高、若松 恵大、中里 慎太郎、山本 萌生、牧野 俊晴、加藤 宙光 、藤井 知、寺井 弘高、関口 雄平、小坂 英男
第84回応用物理学会秋季学術講演会
Event date： 2024.9
Language：Japanese Presentation type：Oral presentation (general)
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Coherent electric field control of neutral nitrogen vacancy center in diamond
Hodaka Kurokawa, Keidai Wakamatsu, Shintaro Nakazato, Toshimaru Makino, Hiromitsu Kato, Yuhei Sekiguchi, Hideo Kosaka
APS March Meeting 2024
Event date： 2024.3
Language：English Presentation type：Oral presentation (general)
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Remote entanglement of superconducting systems using solid-state spin quantum memory
Hodaka Kurokawa, Moyuki Yamamoto, Yuhei Sekiguchi, Hideo Kosaka
APS March Meeting 2022 2022.3 American Physical Society
Event date： 2022.3
Language：English Presentation type：Oral presentation (general)
Venue：Chicago, United States of America Country：United States
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Simulation of Piezo-acoustic Resonator for a Quantum Interface
2021.9
Event date： 2021.9
Language：Japanese Presentation type：Oral presentation (general)
Country：Japan
Social Contribution(Extension lecture) 【 display / non-display 】
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量子情報関東Student Chapter
Role(s)： Lecturer
2022.10