FEBQI

私たちは、理化学研究所量子コンピュータ研究センターの浮揚電子量子情報理研白眉研究チーム（FEBQI） です。

液体ヘリウムおよび固体ネオン上に浮揚する電子を量子情報処理のプラットフォームとして研究しています。これらの電子は液体ヘリウムや固体ネオンの表面からわずかに浮揚した真空中に存在するため、不純物や欠陥のない清浄な環境でコヒーレンス時間が長く、量子コンピュータ実現に向けた理想的なプラットフォームです。

研究内容

液体ヘリウム上の電子 — プラズモン励起・量子シミュレーション・電子スピン量子ビット
固体ネオン上の電子 — 電荷・スピン状態の長いコヒーレンスを利用した量子メモリ
極低温エレクトロニクス — 量子ビット数の拡張に向けた極低温マイクロ波源の開発

→ 詳しくはプロジェクトページへ

募集

ポスドク・インターン（3ヶ月以上） を募集中です。川上恵里加までご連絡ください。

お知らせ

ニュース

31 May 2026

ネオン上の電子の電荷量子ビット論文をarXivに公開

18 May 2026

ワークショップ「固体ネオン上の電子によるスピン量子ビット実現へ向けて」を開催しました

20 Apr 2026

Xianjingおかえり！

→ 詳しくはブログへ

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代表的な論文

arXiv

A charge qubit on solid neon in a spin-qubit compatible circuit QED platform

Jun Wang^*, Yiran Tian, Ivan Grytsenko, Asher Jennings, Xianjing Zhou, Hirotaka Terai, Dafei Jin, and Erika Kawakami^*

arXiv:2605.31185 (2026).

arXiv Bib

@article{wang2026neonqubit,
  title = {A charge qubit on solid neon in a spin-qubit compatible circuit {QED} platform},
  author = {Wang, Jun and Tian, Yiran and Grytsenko, Ivan and Jennings, Asher and Zhou, Xianjing and Terai, Hirotaka and Jin, Dafei and Kawakami, Erika},
  journal = {arXiv},
  number = {arXiv:2605.31185},
  year = {2026},
}

arXiv

Strong Coupling Between RF Photons and Plasmons of Electrons on Liquid Helium

Asher Jennings^*, Ivan Grytsenko, Thomas Giovansili, Itay Josef Barabash, Oleksiy Rybalko, Yiran Tian, Jun Wang, Hiroki Ikegami, and Erika Kawakami^*

arXiv:2601.22552 (2026).

arXiv Bib

@article{jennings2025plasmon,
  title = {Strong Coupling Between RF Photons and Plasmons of Electrons on Liquid Helium},
  author = {Jennings, Asher and Grytsenko, Ivan and Giovansili, Thomas and Barabash, Itay Josef and Rybalko, Oleksiy and Tian, Yiran and Wang, Jun and Ikegami, Hiroki and Kawakami, Erika},
  journal = {arXiv},
  number = {arXiv:2601.22552},
  year = {2026},
}

PRAppl

Nb-Ti-N nanowire resonators and prospects for spin-photon coupling with electrons on solid neon

Yiran Tian, Ivan Grytsenko, Asher Jennings, Jun Wang, Hiroki Ikegami, Xianjing Zhou, Shuhei Tamate, Hirotaka Terai, Hiroki Kutsuma, Dafei Jin, Monica Benito, and Erika Kawakami^*

Phys. Rev. Applied 25, 024011 (2026).

DOI arXiv Bib Journal

@article{tian2025neon,
  title = {Nb-Ti-N nanowire resonators and prospects for spin-photon coupling with electrons on solid neon},
  author = {Tian, Yiran and Grytsenko, Ivan and Jennings, Asher and Wang, Jun and Ikegami, Hiroki and Zhou, Xianjing and Tamate, Shuhei and Terai, Hirotaka and Kutsuma, Hiroki and Jin, Dafei and Benito, Monica and Kawakami, Erika},
  journal = {Phys. Rev. Applied},
  volume = {25},
  pages = {024011},
  year = {2026},
  doi = {10.1103/jq9v-n4rn},
  overleaf = {https://www.overleaf.com/read/vhqcrdqczzjc#4a4b63},
  index = {2024 neon SC nanowire},
}

PRL

Probing the Quantum Capacitance of Rydberg Transitions of Surface Electrons on Liquid Helium via Microwave Frequency Modulation

Asher Jennings^*, Ivan Grytsenko, Yiran Tian, Oleksiy Rybalko, Jun Wang, Itay Josef Barabash, and Erika Kawakami^*

Phys. Rev. Lett. 135, 087001 (2025).

Editors’ Suggestion

DOI arXiv Bib Journal

@article{jennings2025rydberg,
  title = {Probing the Quantum Capacitance of Rydberg Transitions of Surface Electrons on Liquid Helium via Microwave Frequency Modulation},
  author = {Jennings, Asher and Grytsenko, Ivan and Tian, Yiran and Rybalko, Oleksiy and Wang, Jun and Barabash, Itay Josef and Kawakami, Erika},
  journal = {Phys. Rev. Lett.},
  volume = {135},
  pages = {087001},
  year = {2025},
  doi = {10.1103/5y8p-qhb4},
  overleaf = {https://www.overleaf.com/read/wnybdtvxsxyk#ca9ad5},
  overleaf_suppl = {https://www.overleaf.com/read/vhmsmhdscrjm#87fba9},
  index = {2024 Rydberg FM},
  note = {Editors' Suggestion},
}

APL

Quantum computing using floating electrons on cryogenic substrates: Potential and challenges

Asher Jennings^*, Xianjing Zhou, Ivan Grytsenko, and Erika Kawakami^*

Appl. Phys. Lett. 124, 120501 (2024).

DOI arXiv Bib Journal

@article{jennings2024perspectives,
  title = {Quantum computing using floating electrons on cryogenic substrates: Potential and challenges},
  author = {Jennings, Asher and Zhou, Xianjing and Grytsenko, Ivan and Kawakami, Erika},
  lab_members = {Zhou},
  journal = {Appl. Phys. Lett.},
  volume = {124},
  pages = {120501},
  year = {2024},
  doi = {10.1063/5.0179700},
  overleaf = {https://www.overleaf.com/read/knxxdvsvhvyt#29ec0d},
  index = {2024 APL Perspectives},
}