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論文・著書

Hamiltonian of a flux qubit-LC oscillator circuit in the deep-strong- coupling regime,  Fumiki Yoshihara, Sahel Ashhab, Tomoko Fuse, Motoaki Bamba, Kouichi Semba,  Scientific Reports volume 12, Article number: 6764 (2022)
Speed limits for quantum gates with weakly anharmonic qubits,  Sahel Ashhab, Fumiki Yoshihara, Tomoko Fuse, Naoki Yamamoto, Adrian Lupascu, Kouichi Semba,  Phys. Rev. A 105, 042614 (2022)
プレスリリース ”シリコン基板を用いた窒化物超伝導量子ビットの開発に成功”
〜超伝導量子ビットの大規模集積化に向けた新しい材料プラットフォームを提案〜

Enhanced coherence of all-nitride superconducting qubit epitaxially grown on silicon substrate
Sunmi Kim, Hirotaka Terai, Taro Yamashita, Wei Qiu, Tomoko Fuse, Fumiki Yoshihara, Sahel Ashhab, Kunihiro Inomata, Kouichi Semba
Communications Materials volume 2, Article number: 98 (2021)
Quantum state preparation protocol for encoding classical data into the amplitudes of a quantum information processing register's wave function 
S. Ashhab
Deterministic three-photon down-conversion by a passive ultrastrong cavity-QED system 
Kazuki Koshino , Tomohiro Shitara, Ziqiao Ao , Kouichi Semba
Quasiparticle tunneling and 1/f charge noise in ultrastrongly coupled superconducting qubit and resonator
Akiyoshi Tomonaga, Hiroto Mukai, Fumiki Yoshihara, Jaw-Shen Tsai
Characterization of control in a superconducting qutrit using randomized benchmarking, M. Kononenko, M. A. Yurtalan, S. Ren, J. Shi, S. Ashhab, A. Lupascu, Physical Review Research 3, L042007 (2021).
Nonclassicality of open circuit QED systems in the deep-strong coupling regime, Tomohiro Shitara, Motoaki Bamba, Fumiki Yoshihara, Tomoko Fuse, Sahel Ashhab, Kouichi Semba, Kazuki Koshino, New Journal of Physics 23 103009 (2021).

π phase shifter based on NbN-based ferromagnetic Josephson junction on a silicon substrate, Taro Yamashita, Sunmi Kim, Haruki Kato, Wei Qiu, Kouichi Semba, Akira Fujimaki & Hirotaka Terai, Scientific Reports 10, Article number: 13687 (2020) 
Spectrum of the Dicke model in a superconducting qubit-oscillator system,
S. Ashhab, Y. Matsuzaki, K. Kakuyanagi, S. Saito, F. Yoshihara, T. Fuse, K. Semba,
PHYSICAL REVIEW A 99, 063822 (2019)
Fast amplification and rephasing of entangled cat states in a qubit-oscillator system
Z. Xiao, T. Fuse, S. Ashhab, F. Yoshihara, K. Semba, M. Sasaki, M. Takeoka, and J. P. Dowling
PHYSICAL REVIEW A 99, 013827 (2019)
Inversion of qubit energy levels in qubit-oscillator circuits in the deep-strong-coupling regime
Fumiki Yoshihara, Tomoko Fuse, Ziqiao Ao, Sahel Ashhab, Kosuke Kakuyanagi, Shiro Saito, Takao Aoki,  Kazuki Koshino, Kouichi Semba
Phys. Rev. Lett. 120, 183601 (2018)
Efficient Single-Photon Coupling from a Nitrogen-Vacancy Center Embedded in a Diamond Nanowire Utilizing an Optical Nanofiber
Yuya Yonezu, Kentaro Wakui, Kentaro Furusawa, Masahiro Takeoka, Kouichi Semba & Takao Aoki
Scientific Reports 7, Article number: 12985 (2017)
Superradiant phase transition in the presence of parameter fluctuations
S. Ashhab and K. Semba ,
Physical Review A 95, 053833 (2017)  
Characteristic spectra of circuit quantum electrodynamics systems from the ultrastrong to the deep strong coupling regime
F. Yoshihara, T. Fuse, S. Ashhab, K. Kakuyanagi, S. Saito, K. Semba
Physical Review A 95, 053824 (2017) 
Simple method for fabrication of diamond nanowires by inductively coupled plasma reactive ion etching
Kentaro Wakui, Yuya Yonezu, Takao Aoki, Masahiro Takeoka, and Kouichi Semba
Japanese Journal of Applied Physics 56, 058005 (2017) 
Superconducting qubit-oscillator circuit beyond the ultrastrong-coupling regime
Fumiki Yoshihara, Tomoko Fuse, Sahel Ashhab, Kosuke Kakuyanagi, Shiro Saito,
Kouichi Semba
Nature Physics 13, 44-47 (2017) 
Observation of collective coupling between an engineered ensemble of macroscopic artificial atoms and a superconducting resonator
Kosuke Kakuyanagi, Yuichiro Matsuzaki, Corentin Deprez, Hiraku Toida, Kouichi Semba, Hiroshi Yamaguchi, William J. Munro, and Shiro Saito
Phys. Rev. Lett. 117, 210503 (2016) 
Hybrid quantum magnetic field sensor with an electron spin and a nuclear spin in diamond
Yuichiro Matsuzaki, Takaaki Shimo-Oka, Hirotaka Tanaka, Yasuhiro Tokura, Kouichi Semba, and Norikazu Mizuochi
Phys. Rev. A 94, 052330 (2016) 
Characterization and control of measurement induced dephasing on superconducting flux qubit with a Josephson bifurcation
K. Kakuyanagi, Y. Matsuzaki, T. Baba, H. Nakano, S. Saito, and K. Semba
J. Phys. Soc. Jpn. 85, 104801 (2016) 
Optically detected magnetic resonance of high-density ensemble of NV centers in diamond
Y. Matsuzaki, H. Morishita, T. Shimooka, T. Tashima, K. Kakuyanagi, K. Semba, W. J. Munro, H. Yamaguchi, M. Norikazu, and S. Saito
J. Phys.: Condens. Matter 28, 275302 (2016) 
Improving the lifetime of the nitrogen-vacancy-center ensemble coupled with a superconducting flux qubit by applying magnetic fields
Yuichiro Matsuzaki, Xiaobo Zhu, Kosuke Kakuyanagi, Hiraku Toida, Takaaki Shimooka, Norikazu Mizuochi, Kae Nemoto, Kouichi Semba, W. J. Munro, Hiroshi Yamaguchi, and Shiro Saito
Phys. Rev. A 91, 042329 (2015) 
Superconductor-Diamond Hybrid Quantum System
*K. Semba, F. Yoshihara, J. E. S. Johansson, X. Zhu, N. Mizuochi, William J. Munro,
S.Saito, K. Kakuyanagi, and Y. Matsuzaki
Principles and Methods of Quantum Information Technologies, Springer, Lecture Notes in Physics 911, Editors Y. Yamamoto & K. Semba, 515-538 (2016)
Analysis of the spectroscopy of a hybrid system composed of a superconducting flux qubit and diamond NV centers
H Cai, *Y Matsuzaki, K Kakuyanagi, H Toida1, X Zhu, N Mizuochi, K Nemoto, K Semba, W J Munro, S Saito and H Yamaguchi
J. Phys.: Condens. Matter 27, 1-15 (2015)
Observation of quantum Zeno effect in a superconducting flux qubit
*K. Kakuyanagi, T. Baba, Y. Matsuzaki, H. Nakano, S. Saito and K. Semba
New J. Phys. 17 (2015) 063035
Scalable quantum computation architecture using always-on Ising interactions via quantum feedforward
*Takahiko Satoh, *Yuichiro Matsuzaki, Kosuke Kakuyanagi, William J. Munro,
Koichi Semba, Hiroshi Yamaguchi, and Shiro Saito
Phys. Rev. A 91, 052329-1~6 (2015)
Improving the Coherence Time of a Quantum System via a Coupling to a Short-Lived System
*Y. Matsuzaki, X. Zhu, K. Kakuyanagi, H. Toida, T. Shimo-oka, N. Mizuochi, K. Nemoto,
K. Semba, W. J. Munro, H. Yamaguchi, S. Saito
Phys. Rev. Lett. 114, 120501-1~5 (2014)
Observation of dark states in a superconductor diamond quantum hybrid system
Xiaobo Zhu, Yuichiro Matsuzaki, Robert Amsu¨ss, Kosuke Kakuyanagi, Takaaki Shimo-Oka, Norikazu Mizuochi, Kae Nemoto, Kouichi Semba, William J. Munro & *Shiro Saito
Nature Communications, 3424, 1-6 (2014)

講演・発表

金 鮮美(招待講演), 寺井 弘高, 山下太郎, Wei Qiu, 布施 智子, 吉原 文樹, Sahel Ashhab , 猪俣邦宏, 仙場 浩一
Superconducting qubits with epitaxially-grown nitride Josephson junctions
韓国物理学会(KPS)
2022年04月20日~04月22日

Sahel Ashhab, Fumiki Yoshihara, Tomoko Fuse, Naoki Yamamoto, Adrian Lupascu, Kouichi Semba
Speed limits for two-qubit gates with weakly anharmonic qubits
APS March Meeting 2022
2022年3月15日

Fumiki Yoshihara, Sahel Ashhab, Tomoko Fuse, Motoaki Bamba, Kouichi Semba
Hamiltonian of a flux qubit-LC oscillator circuit in the deep-strong coupling regime
APS March Meeting 2022
2022年3月14日

金鮮美(招待講演)
Superconducting qubits with nitride Josephson junctions
理化学研究所 量子コンピュータ研究センター(RQC)セミナー
2022年3月9日

Sahel Ashhab, Fumiki Yoshihara, Tomoko Fuse, Naoki Yamamoto, Adrian Lupascu, Kouichi Semba
Speed limits for two-qubit gates with weakly anharmonic qubits
ISNTT 2021
2021年12月14日~12月17日

S. Kim, H. Terai, T. Yamashita, W. Qiu, T. Fuse, F. Yoshihara, S. Ashhab, K. Inomata, and K. Semba
Enhanced coherence of all-nitride superconducting qubits on a silicon substrate
ISNTT 2021
2021年12月14日~12月17日

T. Fuse, F. Yoshihara, S. Ashhab, K. Kakuyanagi, S. Saito, K. Semba
Coherence measurements of a flux qubit-LC oscillator circuit in the deep-strong coupling regime
ISNTT 2021
2021年12月14日~12月17日

F. Yoshihara, S. Ashhab, T. Fuse, M. Bamba, K. Semba
Hamiltonian of a flux qubit-LC oscillator circuit in the deep-strong-coupling regime
ISNTT 2021
2021年12月14日~12月17日

Z. Ao, F. Yoshihara, T. Fuse, T, Aoki, K. Koshino, K. Semba
Parameter Analysis towards Deterministic Photon Down-conversion in Ultra-strong Coupling Regime
ISNTT 2021
2021年12月14日~12月17日

S. Kim(invited), H. Terai, T. Yamashita, W. Qiu, T. Fuse, F. Yoshihara, S. Ashhab, K. Inomata, and K. Semba
All-nitride superconducting qubit on silicon substrate
ISS2021
2021年11月30日~12月2日

布施 智子, 吉原 文樹, Sahel Ashhab, 角柳 孝輔, 齊藤 志郎, 仙場 浩一
磁束量子ビット-LC 共振器深強結合回路のコヒーレンス測定
日本物理学会 2021年秋季大会
2021年9月20日~9月23日

Sahel Ashhab
Optimizing the control of weakly anharmonic superconducting qubits
Q-LEAP量子AIセミナー(特別セミナー)
2021年4月27日

Sunmi Kim , Hirotaka Terai , Taro Yamashita , Wei Qiu , Tomoko Fuse , Fumiki Yoshihara , Kunihiro Inomata , Kouichi Semba
Capacitively shunted flux qubit based on epitaxially grown NbN/AlN/NbN Josephson junctions on Si substrate
APS March Meeting 2021
2021年3月15日-19日

金 鮮美, 山下太郎, 加藤悠輝, 丘 偉, 布施 智子, 吉原 文樹, 仙場 浩一, 藤巻 朗, 寺井 弘高
π位相シフターを持つNbNベース超伝導量子ビットの開発
電子情報通信学会 超伝導エレクトロニクス研究会(SCE)(オンライン開催), 2020年11月25~26日

吉原 文樹, アシュハブ サヘル, 布施 智子, 馬場 基彰, 仙場 浩一
深強結合領域における磁束量子ビット-LC 共振器結合系の回路 Hamiltonian
日本物理学会2020年秋季大会(オンライン開催), 2020年9月8日~9月11日

S. Kim, T. Yamashita, H. Terai, W. Qiu, T. Fuse, F. Yoshihara, and K. Semba
π位相シフターを持つ NbN ベース超伝導量子ビットの開発
応用物理学会2020年秋季大会(オンライン開催), 2020年9月8日~9月11日

Kouichi Semba, Sahel Ashhab
Conical intersections and Berry phase in deep-strongly coupled superconducting qubit-resonator system
American Physics Society (APS) March Meeting 2020, Colorado Convention Center, Denver, USA, March 2-6, 2020.

Fumiki Yoshihara, Sahel Ashhab, Tomoko Fuse, Kouichi Semba
Derivation of the Hamiltonian of a flux qubit-LC oscillator circuit using the circuit variables
American Physics Society (APS) March Meeting 2020, Colorado Convention Center, Denver, USA, March 2-6, 2020.

T. Fuse, F. Yoshihara, S. Ashhab, K. Kakuyanagi, S. Saito, K. Semba
Time-domain measurements of an ultra-strongly coupled qubit-resonator circuit
American Physics Society (APS) March Meeting 2020, Colorado Convention Center, Denver, USA, March 2-6, 2020.

S. Kim, T. Fuse, F. Yoshihara, W. Qiu, T. Yamashita, Z. Ao, K. Semba and H. Terai
NbN-based superconducting qubit on Si substrate
American Physics Society (APS) March Meeting 2020, Colorado Convention Center, Denver, USA, March 2-6, 2020.

布施智子, Zhihao Xiao,Sahel Ashhab, 吉原文樹, 仙場浩一, 佐々木雅英, 武岡正裕, Jonathan P. Dowling
量子ビットを用いた共振器中のシュレディンガー猫状態制御
分野横断ワークショップ「量子コンピュータ研究開発の現在とこれから」
2020年1月29日, 理化学研究所 鈴木梅太郎記念ホール(東京)

F. Yoshihara, T. Fuse, Z. Ao, S. Ashhab, K. Kakuyanagi, S. Saito, T.
Aoki, K. Koshino, and K. Semba
Inversion of Qubit Energy Levels in Qubit-Oscillator Circuits in the Deep-Strong-Coupling Regime
分野横断ワークショップ「量子コンピュータ研究開発の現在とこれから」
2020年1月29日, 理化学研究所 鈴木梅太郎記念ホール(東京)

S. Kim
Recent Progress on the NbN-based Superconducting Qubit: 0-qubit and π-qubit
分野横断ワークショップ「量子コンピュータ研究開発の現在とこれから」
2020年1月29日、理化学研究所 鈴木梅太郎記念ホール(東京)

F. Yoshihara, S. Ashhab, T. Fuse, and K. Semba
Derivation of the Hamiltonian of a flux qubit-LC oscillator circuit using the circuit variables
EU-USA-Japan International Symposium on Quantum Technology (ISQT2019)
Kyoto Briton hotel, Japan, December 16-17, 2019.

Tomoko Fuse, Zhihao Xiao, Sahel Ashhab, Fumiki Yoshihara, Masahide Sasaki, Kouichi Semba, Masahiro Takeoka, and Jonathan P. Dowling
Fast Amplification and Rephasing of an Entangled Cat States in a Qubit-Oscillator System,
EU-USA-Japan International Symposium on Quantum Technology (ISQT2019)
Kyoto Briton hotel, Japan, December 16-17, 2019.

Sunmi Kim, Taro Yamashita, Tomoko Fuse, Fumiki Yoshihara, Wei Qiu, Ziqiao Ao, Kouichi Semba, and Hirotaka Terai
Recent Progress on the NbN-based Superconducting Qubit: 0-qubit and π-qubit
EU-USA-JAPAN International Symposium on Quantum Technology (ISQT2019),
Kyoto Brighton Hotel, Dec. 16-17, 2019

Kouichi Semba and Sahel Ashhab (QEERI)(Invited)
Conical-intersection and Berry phase in deep-strongly coupled superconducting-qubit-resonator system
Workshop on Innovative Nanoscale Devices and Systems (WINDS2019)(Hawaii)
Kohala Coast, Hawaii, USA, Dec 1 - Dec 6, 2019

F. Yoshihara, S. Ashhab, T. Fuse, and K. Semba
Derivation of the Hamiltonian of a flux qubit-LC oscillator circuit using the circuit variables
International School and Symposium on Nanoscale Transport and phoTonics 2019 (ISNTT2019)
NTT Atsugi R&D Center, Japan, November 18-22, 2019.

Tomoko Fuse, Zhihao Xiao, Sahel Ashhab, Fumiki Yoshihara, Masahide Sasaki, Kouichi Semba, Masahiro Takeoka, and Jonathan P. Dowling
Fast Amplification and Rephasing of a Cat State in a Qubit-Oscillator System
International School and Symposium on Nanoscale Transport and phoTonics 2019 (ISNTT2019)
NTT Atsugi R&D Center, Japan, November 18-22, 2019.

S. Kim, T. Fuse, F. Yoshihara, W. Qiu, T. Yamashita, Z. Ao, K. Semba and H. Terai
NbN-based Superconducting Qubit on SI Substrate
International Scholl and Symposium on Nanoscale Transport and photonics (ISNTT2019),
NTT Atsugi R&D Center, Japan, November 18-22, 2019.

Ziqiao Ao, Fumiki Yoshihara, Tomoko Fuse, Sunmi Kim, Sahel Ashhab, Kosuke Kakuyanagi, Shiro Saito, Tomohiro Shitara, Kazuki Koshino, Takao Aoki, Kouichi Semba
Selection rules of quantum transitions observed in superconducting flux qubit-resonator circuits in the ultra-strong coupling regime
International Scholl and Symposium on Nanoscale Transport and photonics (ISNTT2019),
NTT Atsugi R&D Center, Japan, November 18-22, 2019.

S. Kim, T. Yamashita, T. Fuse, F. Yoshihara, W. Qiu, Z. Ao, K. Semba and H. Terai
Development of NbN-based superconducting quantum circuit: 0-qubit and π-qubit
1st Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems (QCCC2019)
Nagoya University, Japan, Nov. 12th-13th, 2019 (oral)

Kouichi Semba (Keynote Address)
Emerging ultrastrong coupling between light and matter observed in circuit quantum electrodynamics
International Symposium on Mathematics, Quantum Theory, and Cryptography (MQC 2019)
Kyushu University, September 25 - 27, 2019.

吉原文樹(招待講演)
量子情報技術への展開を目指した超伝導人工原子の研究
応用物理学会2019年秋季大会, 2019年9月18-21日, 北海道大学 (札幌)

布施智子, Zhihao Xiao,Sahel Ashhab, 吉原文樹, 仙場浩一, 佐々木雅英, 武岡 正裕, Jonathan P. Dowling
量子ビットを用いた共振器中のシュレディンガー猫状態制御
応用物理学会2019年秋季大会, 2019年9月18-21日, 北海道大学 (札幌)

吉原文樹、アシュハブ サヘル、布施 智子、仙場 浩一
交差共鳴磁束バイアスによる超伝導磁束量子ビット測定法の理論検討
日本物理学会2019年秋季大会, 2019年9月10-13日, 岐阜大学 (岐阜)

布施智子, Zhihao Xiao,Sahel Ashhab, 吉原文樹, 仙場浩一, 佐々木雅英, 武岡正裕, Jonathan P. Dowling
量子ビットを用いた調和振動子中のシュレディンガー猫状態制御
日本物理学会2019年秋季大会, 2019年9月10-13日, 岐阜大学 (岐阜)

金鮮美, 山下太郎, 布施智子, 吉原文樹, 丘偉, 敖子嶠, 仙場浩一, 寺井弘高
Si基板上のNbNベース超伝導量子ビットのコヒーレンス特性
日本物理学会2019年秋季大会, 2019年9月10-13日, 岐阜大学 (岐阜)

吉原文樹(招待講演)
superconducting qubit-oscillator circuit beyond the ultrastrong-coupling
regime
応用物理学会 量子情報グループ研究会, 国立情報学研究所, 2019年10月9日

Kouichi Semba(Invited)
Light-matter interactions beyond strong coupling demonstrated using superconducting artificial atom
Nanjing forum on Superconducting Quantum Computer and System (NFSQCS), Nanjing, China, 18-20 May, 2019.

Kouichi Semba(Invited)
Light-matter interaction beyond strong coupling in circuit QED
20th Anniversary of Superconducting Qubits: Progress and Future Directions (SQ20th)
Tsukuba International Congress Center (EPOCHAL TSUKUBA), May 13-15, 2019

Fumiki YOSHIHARA, Sahel ASHHAB, Tomoko FUSE, and Kouichi SEMBA
Cross-resonance-based readout scheme of a superconducting flux qubit
20th Anniversary of Superconducting Qubits: Progress and Future Directions (SQ20th)
Tsukuba International Congress Center (EPOCHAL TSUKUBA), May 13-15, 2019

Tomoko Fuse, Zhihao Xiao, Sahel Ashhab, Fumiki Yoshihara, Kouichi Semba, Masahide Sasaki,
Masahiro Takeoka, and Jonathan P. Dowling
Fast Amplication and Rephasing of an Entangled Cat States in a Qubit-Oscillator System
20th Anniversary of Superconducting Qubits: Progress and Future Directions (SQ20th)
Tsukuba International Congress Center (EPOCHAL TSUKUBA), May 13-15, 2019

S. Ashhab, Y. Matsuzaki, K. Kakuyanagi, S. Saito, F. Yoshihara, T. Fuse, and K. Semba
Spectrum of the Dicke Model in a Superconducting Qubit-Oscillator System
20th Anniversary of Superconducting Qubits: Progress and Future Directions (SQ20th)
Tsukuba International Congress Center (EPOCHAL TSUKUBA), May 13-15, 2019

S. Kim, T. Yamashita, T. Fuse, F. Yoshihara, W. Qiu, Z. Ao, H. Terai and K. Semba
NbN-based superconducting quantum circuit on Si substrate
20th Anniversary of Superconducting Qubits: Progress and Future Directions (SQ20th)
Tsukuba International Congress Center (EPOCHAL TSUKUBA), May 13-15, 2019

Ziqiao Ao, Fumiki Yoshihara, Tomoko Fuse, Sunmi Kim, Sahel Ashhab, Kosuke Kakuyanagi, Shiro Saito,
Tomohiro Shitara, Kazuki Koshino, Takao Aoki, Kouichi Semba
Observation of forbidden transitions using superconducting flux qubit-coplanar waveguide
resonator circuit in ultra-strong coupling regime
20th Anniversary of Superconducting Qubits: Progress and Future Directions (SQ20th)
Tsukuba International Congress Center (EPOCHAL TSUKUBA), May 13-15, 2019

敖子嶠, 吉原文樹, 布施智子, 金鮮美, Sahel Ashhab, 角柳孝輔, 齊藤志郎, 設楽智洋, 越野和樹, 青木隆朗, 仙場浩一,
超強結合領域にある超伝導磁束量子ビット−コプレーナ共振器結合系での禁制遷移の観測,
日本物理学会2019年春季大会、九州大学(伊都キャンパス)、2019年3月14日-17日

Tomoko Fuse , Zhihao Xiao , Sahel Ashhab , Fumiki Yoshihara , Kouichi Semba , Masahide Sasaki ,
Masahiro Takeoka , Jonathan P. Dowling,
Fast Amplification and Rephasing of Entangled Cat States in a Qubit-Oscillator System,
APS March Meeting 2019, Boston, USA, March 4-8, 2019

Fumiki Yoshihara , Sahel Ashhab , Tomoko Fuse , Kouichi Semba,
Cross-resonance-based readout scheme of a superconducting flux qubit,
APS March Meeting 2019, Boston, USA, March 4-8, 2019

Development of superconducting quantum circuit with π-junction qubit
Sunmi Kim, Fumiki Yoshihara, Tomoko Fuse, Wei Qiu, Ziqiao Ao, Hirotaka Terai, Kou-ichi Semba,
and Taro Yamashita
The 12th Superconducting SFQ VLSI Workshop (SSV 2019), Jan 16-17, 2019, NICT(Kobe)

Research activities on superconducting devices in NICT
Hirotaka Terai, Shigehito Miki, Wei Qiu, Shigeyuki Miyajima, Masahiro Yabuno, amd Fumihiro China
The 12th Superconducting SFQ VLSI Workshop (SSV 2019), Jan 16-17, 2019, NICT(Kobe)

Fabrication and Characterization of Ferromagnetic Josephson Junctions for π-shift Superconducting Flux Quantum Bit
Haruki Kato, Tomohiro Kamiya, Sunmi Kim, Wei Qiu, Akira Kawakami,
Hirotaka Terai, Koichi Semba, Taro Yamashita, and Akira Fujimaki
The 12th Superconducting SFQ VLSI Workshop (SSV 2019), Jan 16-17, 2019, NICT(Kobe)

Kouichi Semba(Contributed Talk), Light-Matter Interaction ‘Beyond’ Strong-Coupling Regime
in Superconducting Circuit Quantum Electrodynamics, WINDS2018,
The Westin Hapuna Beach Resort, Kohala Coast, Hawaii, USA, Nov. 25-30, 2018

超伝導量子メタマテリアルの創成と制御
仙場浩一(招待講演)
JST-CREST「量子状態の高度な制御に基づく革新的量子技術基盤の創出」第3回シンポジウム
東京大学先端科学技術研究センター ENEOSホール 2018年11月21-22日

K. Semba(Invited)
Extremely strong light-matter interactions demonstrated in circuit-QED,
KPS Fall Meeting, 2018.10.24-26 Changwon, Korea

パラメータ変動存在下での超放射相転移
仙場 浩一, アシュハブ サヘル
日本物理学会2018年秋季大会、同志社大学、2018年9月9日-12日

Aharonov-Casher効果を利用した超伝導磁束量子ビットのギャップエネルギーと循環電流
吉原文樹
日本物理学会2018年秋季大会、同志社大学、2018年9月9日-12日

量子ビット-調和振動子結合系におけるシュレディンガー猫状態の生成と増幅
布施 智子, Zhihao Xiao,Sahel Ashhab, 吉原 文樹, 仙場 浩一, 武岡 正裕, Jonathan P. Dowling
日本物理学会2018年秋季大会、同志社大学、2018年9月9日-12日

π接合を用いた超伝導量子メタマテリアル
金鮮美, 山下太郎, 吉原文樹, 布施智子, 丘偉, 敖子嶠, 寺井弘高, 仙場浩一
日本物理学会2018年秋季大会、同志社大学、2018年9月9日-12日

Kouichi Semba(Invited)
第8回半導体/超伝導体量子効果と量子情報の夏期研修会
Light-Matter Interaction beyond `Strong Coupling' in Circuit Quantum Electrodynamics
サンバレー那須、2018年9月4-6日

Kouichi Semba(Invited)
Light-Matter Interaction beyond 'Strong Coupling'in Circuit Quantum Electrodynamics
International Workshop on "Fundamental Problems in Mathematical and Theoretical Physics"
Waseda University, Nishi-Waseda Campus, July 16-21, 2018

Kouichi Semba(Invited)
Various Strong Coupling of Light-Matter Interaction in the Superconducting Quantum Circuit
The International Workshop on Recent Progress in Superconductivity (IWRS2018),
Pyeongchang, Korea, July 9-11, 2018

光シフトを受けた磁束量子ビットにおけるエネルギー準位反転の観測
吉原文樹
日本物理学会 第73回年次大会(2018年)、東京理科大学、2018年3月22日-25日

量子ビット - 調和振動子結合回路の超強領域における時間領域測定
布施智子
日本物理学会 第73回年次大会(2018年)東京理科大学、2018年3月22日-25日

Inversions of qubit energy levels in deep-strongly-coupled qubit-oscillator circuits
F. Yoshihara, T. Fuse, Z. Ao, S. Ashhab, K. Kakuyanagi, S. Saito, T. Aoki,
K. Koshino, and K. Semba
APS March Meeting 2018, Los Angels, March 5–9, 2018

Superradiance phase transition in the presence of parameter fluctuations
S. Ashhab, K. Semba
APS March Meeting 2018, Los Angels, March 5–9, 2018

Superconducting qubit-oscillator circuit beyond the ultrastrong-coupling regime
Fumiki Yoshihara(Invited), Tomoko Fuse, Sahel Ashhab, Kosuke Kakuyanagi, Shiro Saito, Kouichi
Semba
ISS2017, IINO Hall&Conference Center, Tokyo, Japan, Dec. 13-17, 2017

Superconducting quantum metamaterial
Kouichi Semba (Invited)
The meeting of JST-CREST "Creation of an innovative quantum technology platform based on the advanced control of quantum states"
Kyoto University, Dec. 7-8, 2017

Inversion of qubit energy levels in qubit-oscillator circuits in the deep-strong-coupling regime
Fumiki Yoshihara, Tomoko Fuse, Ziqiao Ao, Sahel Ashhab, Kosuke Kakuyanagi, Shiro Saito, Takao Aoki,
Kazuki Koshino, Kouichi Semba,
The meeting of JST-CREST "Creation of an innovative quantum technology platform based on the advanced control of quantum states"
Kyoto University, Dec. 7-8, 2017

Time-domain measurements and control pf a qubit-oscillator coupled circuit in ultra-strong coupling regime
Tomoko Fuse, Fumiki Yoshihara, , Sahel Ashhab, Kosuke Kakuyanagi, Shiro Saito, Kouichi Semba
The meeting of JST-CREST "Creation of an innovative quantum technology platform based on the advanced control of quantum states"
Kyoto University, Dec. 7-8, 2017

超伝導人工原子と電磁場の相互作用はどこまで強くできるか?
仙場浩一(招待講演), 応用物理学会 (超伝導分科会 第56回研究会), アットビジネスセンター東京駅, 2017年12月1日

Superradiance phase transition in the presence of parameter fluctuations
Kouichi Semba(Contributed Talk), S. Ashhab
WINDS2017, Hapuna Beach Prince Hotel Kohala Coast, Hawaii, USA, Nov. 26-Dec. 1, 2017

Superconducting qubit-oscillator circuit beyond the ultrastrong-coupling regime
Fumiki Yoshihara(Contributed Talk), Tomoko Fuse, Sahel Ashhab, Kosuke Kakuyanagi, Shiro Saito, Kouichi
Semba
WINDS2017, Hapuna Beach Prince Hotel Kohala Coast, Hawaii, USA, Nov. 26-Dec. 1, 2017

F. Yoshihara, T. Fuse, Z. Ao, S. Ashhab, K. Kakuyanagi, S. Saito, T. Aoki, and K. Semba
Twists of qubit energies in deep-strongly-coupled qubit-oscillator circuits
ISNTT2017
NTT Basic Reasearch Laboratories, Nov, 13-17, 2017

Tomoko Fuse, Fumiki Yoshihara, Sahel Ashhab, Kosuke Kakuyanagi, Shiro Saito, and Kouichi Semba
Parity symmetry and selection rules in a qubit-harmonic oscillator coupled system
ISNTT2017
NTT Basic Reasearch Laboratories, Nov, 13-17, 2017

Z. Ao, F. Yoshihara, T. Fuse, S. Ashhab, K. Kakuyanagi, S. Saito, T. Aoki, and K. Semba
Giant Lamb shift observed in deep-strongly-coupled superconducting qubit-oscillator circuit
ISNTT2017
NTT Basic Reasearch Laboratories, Nov, 13-17, 2017

Twists of qubit energy levels in deep-strongly-coupled qubit-oscillator circuits
Fumiki YOSHIHARA, Tomoko Fuse, Ao Ziqiao, Sahel Ashhab, Kosuke Kakuyanagi, Shiro Saito, Takao, Aoki,
and Kouichi Semba
Quantum Theory&Technology Un-official Meeting 2017
Oct. 7-8, 2017, Hokkaido-University

深強結合領域における量子ビット -共振回路系の特徴的なスペクトル
吉原文樹, 布施智子, Sahel Ashhab, 角柳孝輔, 齊藤志郎, 仙場浩一、
日本物理学会 2017年秋季大会, 2017年9月21日〜24日, 岩手大学

量子ビット -共振回路結合系における対称性と遷移選択則の観測
布施智子, 吉原文樹, Sahel, Ashhab, 角柳孝輔, 齊藤志郎, 仙場浩一
日本物理学会 2017年秋季大会, 2017年9月21日〜24日, 岩手大学

超伝導磁束量子ビット -LC共振器深強結合系で観測された巨大Lambシフト
アオ・ズチャオ, 吉原文樹, 布施智子, Sahel Ashhab, 角柳孝輔, 齊藤志郎, 青木隆朗, 仙場浩一
日本物理学会 2017年秋季大会, 2017年9月21日〜24日, 岩手大学

F. Yoshihara, T. Fuse, S. Ashhab, K. Kakuyanagi, S. Saito, and K. Semba
Characteristic spectra of circuit quantum electrodynamics systems from the ultrastrong to
the deep-strong-coupling regime
International Symposium on Hybrid Quantum Sytems 2017 (HQS2017)
Sep. 10-13, 2017, Miyagi-Zao

T. Fuse, F. Yoshihara, S. Ashhab, K. Kakuyanagi, S. Saito, K. Semba
Symmetry and selection rules in a qubit-oscillator coupled system
International Symposium on Hybrid Quantum Sytems 2017 (HQS2017)
Sep. 10-13, 2017, Miyagi-Zao

Z. Ao, F. Yoshihara, T. Fuse, S. Ashhab, K. Kakuyanagi, S. Saito, T. Aoki, K. Semba
Giant Lamb shift observed in deep-strongly-coupled superconducting qubit-oscillator
circuit
International Symposium on Hybrid Quantum Sytems 2017 (HQS2017)
Sep. 10-13, 2017, Miyagi-Zao

Kouichi Semba(Invited)
New Light-Matter Ground State in the Deep Strong Coupling Regime
EDISON 20, July 17-21, 2017, Hyatt Regency Hotel, Buffalo, NY, USA

Kouichi Semba(Invited)
Superconducting qubit–oscillator circuit in the extremely strong-coupling
International Workshop on Quantum Technologies (QTech2017), June 12-13, 2017, The Univ. of Tokyo

Kouichi Semba(Invited)
Superconducting qubit–oscillator circuit beyond the ultrastrong-coupling regime
Symposium on Atomic, Molecular, and Optical Sciences 14, June 30-July 1, 2017, The Univ. of Electro-Communications

Kouichi Semba (invited)
Quantum Hybrid System and NV Centers in Diamond
The 64th JSAP Spring Meeting 2017, March 14-17, Pacifico Yokohama

T. Fuse, F. Yoshihara, S. Ashhab, K. Semba
Deep strong coupling in a circuit QED system - huge Lamb shift -
American Physics Society (APS) March Meeting 2017, Ernest N. Morial Convention Center, New Orleans, USA, March 13-17, 2017.

F. Yoshihara, T. Fuse, K. Semba, S. Ashhab
Characteristic spectra of circuit quantum electrodynamics systems from the ultrastrong to the deep strong coupling regime
American Physics Society (APS) March Meeting 2017, Ernest N. Morial Convention Center, New Orleans, USA, March 13-17, 2017.

T. Fuse (invited), F. Yoshihara, S. Ashhab, Kosuke Kakuyanagi, Shiro Saito, K. Semba,
Superconducting Qubit-Oscillator Circuit in the Deep Strong Coupling Regime ~Experiments~
Interdisciplinary Workshop on Quantum Device (IWQD2017), Tokyo, 6-8 March, 2017

T. Fuse (invited), F. Yoshihara, S. Ashhab, K. Semba
Superconducting Qubit-Oscillator Circuit in the Deep Strong Coupling Regime
JSAP Workshop on Quantum Information and Related Fields, NII, Tokyo, Japan, March 2-3, 2017.

T. Fuse (invited), F. Yoshihara, S. Ashhab, K. Semba
Superconducting qubit-oscillator circuit in the deep strong coupling regime
Workshop on Virtual Photons in ultra-strong coupled Systems, RIKEN, Saitama, Japan, Janurary 23-26, 2017.

Fumiki Yoshihara (Invited)
Characteristic spectra of circuit quantum electrodynamics systems from the ultrastrong to the deep strong coupling regime
Workshop on Virtual Photons in ultra-strong coupled Systems, RIKEN, Saitama, Japan, Janurary 23-26, 2017.

Kouichi Semba (Invited)
Stable ‘Molecular’ State of Photons and Artificial Atom
International Workshop on Nano-Spin Conversion Science and Quantum Spin Dynamics(NSCS-QSD) October 12-15, 2016,
The University of Tokyo

Fumiki Yoshihara (Invited)
Superconducting qubit-oscillator circuit beyond the ultrastrong-coupling regime
International Workshop on Ultra-Strong Light-Matter Interactions: theory and applications to quantum information, 19-21 September 2016,
Bilbao, Spain

超伝導人工原子・調和振動子 超強結合系
布施智子
第63回応用物理学会春季学術講演会(招待講演), 2016年3月22日, 東京工業大学 大岡山キャンパス

Deep strong coupling in a circuit QED system (1) – Introduction –
Kouichi Semba , Tomoko Fuse , Fumiki Yoshihara , Sahel Ashhab
American Physical Society March Meeting 2016 ,March 14–18, 2016, Baltimore, Maryland
Deep strong coupling in a circuit QED system (2) – experiment –
Tomoko Fuse , Fumiki Yoshihara , Sahel Ashhab , Kouichi Semba
American Physical Society March Meeting 2016 ,March 14–18, 2016, Baltimore, Maryland
Deep strong coupling in a circuit QED system (3) – data and analysis –
Fumiki Yoshihara , Tomoko Fuse , Kouichi Semba , Sahel Ashhab
American Physical Society March Meeting 2016 ,March 14–18, 2016, Baltimore, Maryland
Physics of Superconducting quantum circuit – perspective of strong coupling and beyond
Kouichi Semba, IWQD2015 (招待講演), Oct.13-14, 2015, NII
Superconducting Flux Qubit & Electron Spin Ensemble in Diamond Hybrid Quantum System,
Kouichi Semba
The 67th Fujihara seminar: “Real-time dynamics of physical phenomena and manipulation
by external field” (招待講演), September 25, 2014, Tomakomai, Hokkaido, Japan

超伝導量子ビットとマイクロ波を使った実験
吉原 文樹
京都大学基礎物理学研究所 研究会 「若手のための量子情報基礎セミナー」(招待講演)
2014年8月10日~11日, 京都大学基礎物理学研究所 湯川記念館

T. Fuse, Fumiki Yoshihara, Kouichi Semba
Josephson bifurcation amplifier, flux qubit and Josephson parametric amplifier
Gordon Research Conference: Quantum Science 2014, 26 July 2014,
Stonehill College, MA, USA

仙場浩一
巨視的量子ハイブリッド系
QIT29(招待講演), 2013年11月19日, 早稲田大学西早稲田キャンパス

Challenges & Trends of Quantum Information Technology in Japan
Kouichi Semba
The 1st Japan-Canada IT Symposium (招待講演), Oct 9, 2013, Embassy of Canada, Japan

Kouichi Semba [invited]
"Coherent Coupling of a Superconducting Flux Qubit to an Electron Spin Ensemble in Diamond"
Gordon Research Conference: Quantum Science 2012, Stonehill College, MA, USA, 12-17 August 2012 https://www.grc.org/quantum-science-conference/2012/

その他・備考

News & Views 紹介記事
‘Cavity quantum electrodynamics: Beyond strong’ by Kater Murch https://www.nature.com/articles/nphys3931

受賞:応用物理学会論文賞 2011.7.8.
K. Kakuyanagi, S. Kagei, S. Saito, H. Nakano, and K. Semba
Generation of Non-Classical Microwave Photon States in an Inductor-Capacitor Resonator Coupled to a Superconducting Flux Qubit
Appl. Phys. Express 3 103101 (2010)

「量子メモリーの原理実験に成功 ~ ダイヤモンドと超伝導ハイブリッド系の量子状態制御に初めて成功 ~」

「ダイヤモンドと超伝導量子ビットを直接組み合わせたハイブリッド系の量子状態制御に世界で初めて成功」

仙場 浩一, 3000万個で量子もつれ日経サイエンス 2012年1月号 p.25