FEBQI

S51棟

〒351-0198 埼玉県和光市広沢2-1

rikenEonHe@gmail.com

私たちは、理化学研究所（RIKEN）の白眉研究チーム 浮揚電子ベース量子情報（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。これらの電子は不純物や欠陥のない清浄な環境に存在するため、長いコヒーレンス時間が期待でき、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 — スケーラブルな電子スピン量子ビットの実現
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

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。

news

31 Oct 2024	プラズモン論文がarXivに公開されました！液体ヘリウム表面上の浮揚電子の集団励起（プラズモンモード）に関する新しい研究成果です。
31 Aug 2024	ポスドク・インターン（3ヶ月以上）を募集中です。erika.kawakami@riken.jpまでご連絡ください。
31 Mar 2024	トンネルダイオード発振器を用いた極低温マイクロ波源を開発。商用源より優れた振幅安定性を実現しました。

latest posts

22 Apr 2026
25 Mar 2026	Hochan Chungが学士論文優秀賞を受賞
10 Mar 2026	お誕生日おめでとう

selected publications

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},
  year = {2026},
}

PRA

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 Overleaf

@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).

DOI arXiv Bib Journal Overleaf

@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},
  index = {2024 Rydberg FM},
}

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 Overleaf

@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},
}

PRA

Blueprint for quantum computing using electrons on helium

Erika Kawakami^* , Jiabao Chen , Monica Benito , and Denis Konstantinov

Phys. Rev. Applied 20, 054022 (2023).

DOI arXiv Bib Journal Overleaf

@article{kawakami2023blueprint,
  title = {Blueprint for quantum computing using electrons on helium},
  author = {Kawakami, Erika and Chen, Jiabao and Benito, Monica and Konstantinov, Denis},
  journal = {Phys. Rev. Applied},
  volume = {20},
  pages = {054022},
  year = {2023},
  doi = {10.1103/PhysRevApplied.20.054022},
  overleaf = {https://www.overleaf.com/read/gbxxyfjxmrgq#de6658},
  index = {2023 PRApplied Blueprint},
}