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Journal Articles

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)
NICT Press Release "All-nitride Superconducting Qubit Made on a Silicon Substrate"
Enhanced Coherence of all-nitride superconducting qubit epitaxially grown on silicon subtrate
Sunmi KIm, Hitotaka Terai, Taro Yamashita, Wei Qiu, Tomoko Fuse, Fumiki Yoshihara, Sahel Ashhab, Kunihiro Inomata, Kouichi Semba
Communications Materials Volume2, 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 substrateTaro 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
Physical Review Letter 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
Physical Review Letter 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
Physical Review 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
Journal of the Physical Society of Japan 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
Journal of Physics: Condensed. 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
Physical Review 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
Journal of Physics: Condensed 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 Journal of Physics 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
Physical Review 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
Physical Review Letter 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)

Conference presentations

S. Kim (Invited), H. Terai, T. Yamashita, Wei Qiu, T. Fuse, F. Yoshihara, S. Ashhab, K. Inomata, K. Semba
Superconducting qubits with epitaxially-grown nitride Josephson junctions
The Korean Physical Society (KPS)
April 20-22, 2022
 
S. Ashhab, F. Yoshihara, T. Fuse, N. Yamamoto, A. Lupascu, K. Semba
Speed limits for two-qubit gates with weakly anharmonic qubits
APS March Meeting 2022
March 15, 2022
 
F. Yoshihara, S. Ashhab, T. Fuse, M. Bamba, K. Semba
Hamiltonian of a flux qubit-LC oscillator circuit in the deep-strong coupling regime
APS March Meeting 2022
March 14, 2022
 
S. Kim (Invited)
Superconducting qubits with nitride Josephson junctions
RIKEN Center for Quantum Computing (RQC) Seminar
March 9, 2022
 
S. Ashhab, F. Yoshihara, T. Fuse, N. Yamamoto, A. Lupascu, K. Semba
Speed limits for two-qubit gates with weakly anharmonic qubits
ISNTT 2021
December 14-17 2021
 
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
December 14-17 2021
 
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
December 14-17 2021
 
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
December 14-17 2021
 
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
December 14-17 2021
 
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
November 30-December2, 2021
 
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
The Physical Society of Japan (JPS) 2021 Autumn Meeting
September 20-23, 2021
 
Sahel Ashhab
Optimizing the control of weakly anharmonic superconducting qubits
Q-LEAP Quantum AI Seminar (Special Seminar)
April 27, 2021
 
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
March 15-19, 2021
 
Sunmi Kim, Taro Yamashita, Yuki Kato, Wei Qiu, Tomoko Fuse, Fumiki Yoshihara, Koichi Semba, Akira Fujimaki, Hirotaka Terai, Development of NbN-based superconducting qubit with π-phase shifter,
The meeting of the technical group on superconducting electronics(SCE), The Institute of electronics, information and communication engineers.
November 25-26, 2020 

Fumiki Yoshihara, Sahel Ashhab, Tomoko Fuse, Motoaki Bamba, Kouichi Semba
Circuit Hamiltonian of a flux qubit-LC oscillator system in the deep-strong-coupling regime
The Physical Society of Japan, 2020 fall meeing, September 8-11, 2020

S. Kim, T. Yamashita, H. Terai, W. Qiu, T. Fuse, F. Yoshihara, and K. Semba
Development of NbN-based superconducting qubit with π-phase shifter,
The Japan Society of applied physics, 2020 fall meeing, September 8-11, 2020
 
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.
 
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
Workshop "Present and future of quantum computer research and development"
RIKEN, January 29, 2020
 
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 
Workshop "Present and future of quantum computer research and development"
RIKEN, January 29, 2020
 
S. Kim
Recent Progress on the NbN-based Superconducting Qubit: 0-qubit and π-qubit
Workshop "Present and future of quantum computer research and development"
RIKEN, January 29, 2020
 
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 
 
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, 

Fumiki Yoshihara(Invited), Research on superconducting artificial atoms aimed at developing quantum information technology, The Japan Society of Applied Physics, 2019 Fall Meeting, September 18-21, 2019,  Hokkaido University
 
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
The Japan Society of Applied Physics, 2019 Fall Meeting, September 18-21, 2019,  Hokkaido University

Fumiki YOSHIHARA, Sahel ASHHAB, Tomoko FUSE, and Kouichi SEMBA
Cross-resonance-based readout scheme of a superconducting flux qubit
The physical society of Japan 2019 Fall Meeting, September 10-13, 2019, Gifu University
 
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
The physical society of Japan 2019 Fall Meeting, September 10-13, 2019, Gifu University

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
The physical society of Japan 2019 Fall Meeting, September 10-13, 2019, Gifu University

Fumiki Yoshihara
Superconducting qubit-oscillator circuit beyond the ultrastrong-coupling
regime, The meeting of the Japan Society of Applied Physics, NII, October 9, 2019

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

Z. Ao, F. Yoshihara, T. Fuse, S. Kim, S. Ashhab, K. Kakuyanagi, S. Saito, T. Shitara, K. Koshino, T. Aoki, K. Semba
Observation of forbidden transition using coupled superconducting flux qubit-coplanar waveguide resonator circuit in ultra-strong coupling regime
The Physical Society of Japan (JPS) , Spring Meeting 2019, Kyushu University, 14-17 March, 2019

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

Sunmi Kim, Fumiki Yoshihara, Tomoko Fuse, Wei Qiu, Ziqiao Ao, Hirotaka Terai, Kou-ichi Semba,
and Taro Yamashita
Development of superconducting quantum circuit with π-junction qubit
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

K. Semba(Invited)
Creation and control of superconducting quantum meta-materials
JST-CREST"Creation of an innovative quantum technology platform based on the advanced control of quantum states"
The 3rd Symposium,  Research Center for Advanced Science and Technology, ENEOS Hall
Nov. 21-22, 2018

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

Kouichi Semba, Sahel Ashhab
Superradiance phase transition in the presence of parameter fluctions
The Physical Society of Japan 2018 Autumn Meeting, Doshisha University, September 9-12, 2018

Fumiki Yoshihara
The gap energy and the persistent current of a superconducting flux qubit based on the Aharonov-Casher effect
The Physical Society of Japan 2018 Autumn Meeting, Doshisha University, September 9-12, 2018

Tomoko Fuse, Zhihao Xiao,Sahel Ashhab, Fumiki Yoshihara, Kouichi Semba, Masahiro Takeoka, Jonathan P. Dowling
Schrodinger-cat state generation and amplification in a qubit-harmonic oscillator coupled system
The Physical Society of Japan 2018 Autumn Meeting, Doshisha University, September 9-12, 2018

Sunmi Kim, Taro Yamashita, Fumiki Yoshihara, Tomoko Fuse, Qiu Wei, Hirotaka Terai, Kouichi Semba
Superconducting Quantum Metamaterial with π-junction
The Physical Society of Japan 2018 Autumn Meeting, Doshisha University, September 9-12, 2018

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

F. Yoshihara, T. Fuse, Z. Ao, S. Ashhab, K. Kakuyanagi, S. Saito, T. Aoki,
K. Koshino, and K. Semba
Inversions of qubit energy levels in deep-strongly-coupled qubit-oscillator circuits
The Physical Society of Japan annual meeting, Tokyo University of Science, March 22-25, 2018

T. Fuse, F. Yoshihara, S. Ashhab, K. Kakuyanagi, S. Saito, K. Semba
Time-domain measurements of a qubit-harmonic oscillator circuit in the ultra-strong coupling regime
The Physical Society of Japan annual meeting, Tokyo University of Science, March 22-25, 2018

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

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

Fumiki Yoshihara(Invited)
Inversion of qubit energy levels in deep-strongly-coupled qubit-oscillator circuits
International Symposium on Dynamics in Artificial Quantum Systems (DAQS2018)
ENEOS Hall, The University of Tokyo, Jan.15-17, 2018

T. Fuse, F. Yoshihara, S. Ashhab, K. Kakuyanagi, S. Saito, K. Semba
Time-domain measurements of a qubit-harmonic oscillator circuit in the ultra-strong coupling regime
International Symposium on Dynamics in Artificial Quantum Systems (DAQS2018)
ENEOS Hall, The University of Tokyo, Jan.15-17, 2018

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

Kouichi Semba (Invited)
Superconducting quantum metamaterial
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


Fumiki Yoshihara, Tomoko Fuse, Ziqiao Ao, Sahel Ashhab, Kosuke Kakuyanagi, Shiro Saito, Takao Aoki,
Kazuki Koshino, Kouichi Semba,
Inversion of qubit energy levels in qubit-oscillator circuits in the deep-strong-coupling regime
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

Tomoko Fuse, Fumiki Yoshihara, , Sahel Ashhab, Kosuke Kakuyanagi, Shiro Saito, Kouichi Semba
Time-domain measurements and control pf a qubit-oscillator coupled circuit in ultra-strong coupling regime
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

Kouichi Semba(Invited)
How Strong can the interaction between a superconducting qubit and an electromagnetic field be?
The 56th meeting of The Japan Society of Applied Physics, Atto Business Center Tokyo, Dec. 1, 2017

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

Fumiki Yoshihara(Contributed Talk), Tomoko Fuse, Sahel Ashhab, Kosuke Kakuyanagi, Shiro Saito, Kouichi
Semba
Superconducting qubit-oscillator circuit beyond the ultrastrong-coupling regime
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

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

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
The Physical Society of Japan 2017 Autumn Meeting
Sep. 21-24, 2017, Iwate University

T. Fuse, F. Yoshihara, S. Ashhab, K. Kakuyanagi, S. Saito, K. Semba
Symmetry and selection rules in a qubit-oscillator coupled system
The Physical Society of Japan 2017 Autumn Meeting
Sep. 21-24, 2017, Iwate University

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
The Physical Society of Japan 2017 Autumn Meeting
Sep. 21-24, 2017, Iwate University

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

Superconducting Artificial Atoms/harmonic oscillator Ultra-strong Coupling
Tomoko Fuse 【Invited】
The 63rd JSAP Spring Meeting, 2016, March 22, 2016, Tokyo Inst. Of Tech. Ookayama Campus

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 【Invited】, Oct.13-14, 2015, NII

Superconducting Flux Qubit & Electron Spin Ensemble in Diamond Hybrid Quantum System, K. Semba
The 67th Fujihara seminar: “Real-time dynamics of physical phenomena and manipulation
by external field” 【Invited】, September 25, 2014, Tomakomai, Hokkaido, Japan

Experimental using Superconducting quantum bit and microwave
Fumiki Yoshihara
Seminar of quantum information for young researchers【Invited】
August 10-11, 2014, Yukawa Institute for Theoretical Physics, Kyoto University

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

Kouichi Semba
Macroscopic Quantum Hybrid System【Invited】
QIT29, Nov 19, 2013, Nishiwaseda Campus, Waseda University

Challenges & Trends of Quantum Information Technology in Japan
Kouichi Semba
The 1st Japan-Canada IT Symposium【Invited】, 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/

Others

2011.7.8: Awarded the paper encouragement prize of The Japan society of applied physics.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)

“Experimental demonstration of quantum memory in diamond”
“Hybrid system composed of a superconducting flux qubit and an electron spin ensemble in diamond: A theoretical analysis”

Journal:
Tomoko Fuse, Fumiki Yoshihara, Kosuke Kakuyanagi, and Kouichi Semba
Interaction between an Artificial Atom and an Electromagnetic Field~Beyond the Strong Couplin~
The article of The physical society of Japan, 2018, January P.21-26, Vol 73, No.1, 2018

Dr. Kouichi Semba, SCIENTIFIC AMERICAN June 2016 P.34-43
Translation of
Original Title “Quantum Connections” SCIENTIFIC AMERICAN May 2016
Original Authors: Christopher R. Monroe, Robert J. Schoelkopf, Mikhail D. Lukin

Dr. Kouichi Semba, “Quantum Entanglement” Scientific American January 2012, p.25

X. Zhu, et al.
Coherent coupling of a superconducting flux qubit to an electron spin ensemble in diamond,
Nature 478, 221-224 (2011)
Quantum engineering: Spins coupled to a persistent current,
Nature, News & Views 478, 195-196 (2011)