Publications

Quantum circuit synthesis via random combinatorial search ,  Sahel Ashhab, Fumiki Yoshihara, Miwako Tsuji, Mitsuhisa Sato, Kouichi Semba,  arXiv:2311.17298 (2023)

Controlling qubit-oscillator systems using linear parameter sweeps,  Sahel Ashhab, Tomoko Fuse, Fumiki Yoshihara, Sunmi Kim and Kouichi Semba,  New J. Phys. 25 093011 (2023)

High-frequency suppression of inductive coupling between flux qubit and transmission line resonator,  Sahel Ashhab, Ziqiao Ao, Fumiki Yoshihara, Adrian Lupascu, Kouichi Semba,  arXiv:2308.07849 (2023)

Extremely large Lamb shift in a deep‑strongly coupled circuit QED system with a multimode resonator,  Ziqiao Ao, Sahel Ashhab, Fumiki Yoshihara, Tomoko Fuse, Kosuke Kakuyanagi, Shiro Saito, Takao Aoki, Kouichi Semba,  Scientific Reports volume 13, Article number: 11340 (2023)

Using machine learning to find exact analytic solutions to analytically posed physics problems,  Sahel Ashhab,  arXiv:2306.02528 (2023)

Nonlinear Landau-Zener-Stückelberg-Majorana problem,  Sahel Ashhab, Olga A. Ilinskaya, and Sergey N. Shevchenko,  Phys. Rev. A 106, 062613 (2022)

All-Nitride Superconducting Qubit with Epitaxial Josephson Junctions on Si Substrate,  Sunmi Kim, Hirotaka Terai, Taro Yamashita, Kunihiro Inomata,  Journal of the Physical Society of Japan, 2022 Volume 77 Issue 12 Pages 805-810

NICT Press Release ”New Method to Systematically Find Optimal Quantum Operation Sequences for Quantum Computers Developed”
Numerical analysis of quantum circuits for state preparation and unitary operator synthesis,  Sahel Ashhab, Naoki Yamamoto, Fumiki Yoshihara, and Kouichi Semba,   Phys. Rev. A 106, 022426 (2022)

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)

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)

Kouichi Semba (Presenter),
Can the qubit frequency remain finite even under the very strong Lamb shift from an infinite number of electromagnetic modes, The Workshop on Innovative Nanoscale Devices and Systems (WINDS) 2023, Hawaii, USA, December 5 2023

Sunmi Kim (Presenter),
Niobium-nitride-based superconducting qubit, Quantum Innovation 2023, Tokyo Convention Hall, November 16 2023

Sunmi Kim (Presenter), Leonid V. Abdurakhimov, Duong Pham, Wei Qiu, Hirotaka Terai, Sahel Ashhab, Taro Yamashita, Shiro Saito, and Kouichi Semba,
Niobium-nitride-based superconducting flux qubit with π-phase shifter, EUCAS2023(16th European Conference on Applied Superconductivity, September 6 2023

Sahel Ashhab (Presenter),
New mathematics and machine learning applications from qubits and oscillators, International Council for Industrial and Applied Mathematics (ICIAM), Tokyo, Waseda University, Japan, August 21 2023

Sahel Ashhab (Presenter), F. Yoshihara, T. Fuse, N. Yamamoto, A. Lupascu, K. Semba,
Speed limits for two-qubit gates with weakly anharmonic qubits, Sixth International Conference on Applied Mathematics, Modeling and Computer Simulation (AMMCS), Waterloo, Canada, August 18 2023

Sahel Ashhab (Presenter),
Exploring new frontiers with superconducting qubit circuits: expanding the Hilbert space beyond qubits and pushing qubit-cavity coupling to the deep strong regime, Institute of Quantum Computing (IQC) Seminar, Waterloo, Canada, August 10 2023

Sahel Ashhab (Presenter),
Exploring new frontiers with superconducting qubit circuits: expanding the Hilbert space beyond qubits and pushing qubit-cavity coupling to the deep strong regime, National Institute of Standards and Technology (NIST), USA, June 26 2023

Sahel Ashhab (Presenter),
Exploring new frontiers with superconducting qubit circuits: expanding the Hilbert space beyond qubits and pushing qubit-cavity coupling to the deep strong regime, Quantum Engineering Seminar in Colorado School of Mines, Golden, Colorado, USA, June 23 2023

Sahel Ashhab (Presenter), Naoki Yamamoto, Fumiki Yoshihara, and Kouichi Semba
Numerical analysis of quantum circuits for state preparation and unitary operator synthesis, The Optica Quantum 2.0 Conference, Hyatt Regency Denver, USA, June 10 2023

Sunmi Kim (Presenter), Hirotaka Terai, Taro Yamashita, Kunihiro Inomata,
All-Nitride Superconducting Qubit with Epitaxial Josephson Junctions on Si Substrate, The 158th Research Meeting (online) of JASP Division of Crystals Science and Technology, April 21 2023

Tomoko Fuse (Presenter), Fumiki Yoshihara, Ashhab Sahel, Kosuke Kakuyanagi, Shiro Saito, Kouichi Semba,
Time-domain measurements of a deep-strongly coupled superconducting flux qubit-LC oscillator system, The 70th JSAP Spring Meeting 2023, Yotsuya Campas, Sophia University, March 17 2023

Sahel Ashhab (Presenter), Naoki Yamamoto, Fumiki Yoshihara and Kouichi Semba,
Numerical analysis of quantum circuits for state preparation and unitary operator synthesis, APS March Meeting 2023 Las Vegas, March 10 2023

Ziqiao Ao, Sahel Ashhab ,Fumiki Yoshihara, Tomoko Fuse, Kosuke Kakuyanagi, Shiro Saito ,Takao Aoki, Kouichi Semba (Presenter)
Observation of Extremely Large Lamb Shift in a Multi-mode Circuit QED System in Deep-strong Coupling Regime, APS March Meeting 2023 Las Vegas, March 9 2023

S. Kim, H. Terai, T. Yamashita, W. Qiu, T. Fuse, F. Yoshihara, S. Ashhab, K. Inomata, and K. Semba(Presentor)
All-nitride superconducting qubits epitaxially grown on silicon substrate,
Workshop on Innovative Nanoscale Devices and Systems (WINDS) 2022, Island of Kaua'i (Hawaii,USA), Dec. 4-9, 2022
December 8, 2022

Sahel Ashhab(Presentor), Fumiki Yoshihara, Tomoko Fuse, Naoki Yamamoto, Adrian Lupascu, Kouichi Semba
Speed limits for two-qubit gates with weakly anharmonic qubits,
Workshop on Innovative Nanoscale Devices and Systems (WINDS) 2022, Island of Kaua'i (Hawaii,USA), Dec. 4-9, 2022
December 7, 2022

Sunmi Kim (Invited), H. Terai, T. Yamashita, W. Qiu, T. Fuse, F. Yoshihara, S. Ashhab, K. Inomata, K. Semba
Coherence properties of NbN-based superconducting qubits
The 15th Asia Pacific Physics Conference (APPC15)
August 24, 2022

S. Kim (Invited), H. Terai, T. Yamashita, Wei Qiu, T. Fuse, F. Yoshihara, S. Ashhab, K. Inomata, K. Semba

Fumiki YOSHIHARA, Sahel ASHHAB, Tomoko FUSE, and Kouichi SEMBA



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/

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”

“Welcome to the Quantum World” (only Japanese) Dr. Kouichi Semba Interview #001

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)