Yusuke Tominaga, Shotaro Shirai, Yuji Hishida, Hirotaka Tearai, Atsushi Noguchi
Intrinsic quality factors approaching 10 million in superconducting planar resonators enabled by spiral geometry
EPJ Quantum Technol. 12, 60 (2025), DOI: 10.1140/epjqt/s40507-025-00367-wKazuki Koshino
Galvanically connected tunable coupler between a cavity and a waveguide
New J. Phys. 27 043001 (2025), DOI: 10.1088/1367-2630/adc1fbDaisuke Hoshi, Toshiaki Nagase, Sangil Kwon, Daisuke Iyama, Takahiko Kamiya, Shiori Fujii, Hiroto Mukai, Shahnawaz Ahmed, Anton Frisk Kockum, Shohei Watabe, Fumiki Yoshihara, Jaw-Shen Tsai
Entangling Schrödinger’s cat states by bridging discrete- and continuous-variable encoding
Nat. Commun 16, 1309 (2025), DOI: 10.1038/s41467-025-56503-8Masamitsu Tanaka, Yoshihiro Kitagawa, Tetsuro Satoh, Tsuyoshi Yamamoto
Low-Power Single-Flux-Quantum Standard Cell Library Using 250 A/cm2 Process for Qubit Control Applications
IEEE Transactions on Applied Superconductivity 35,1700405 (2024), DOI: 10.1109/TASC.2024.3521892Yosuke Ueno, Satoshi Imamura, Yuna Tomida, Teruo Tanimoto, Masamitsu Tanaka, Yutaka Tabuchi, Koji Inoue, Hiroshi Nakamura
C3-VQA: Cryogenic Counter-Based Coprocessor for Variational Quantum Algorithms
IEEE Transactions on Quantum Engineering 6, 3100317 (2024), DOI: 10.1109/TQE.2024.3521442Shimpei Goto, Kazuki Koshino
Labeling Eigenstates of Qubit-Cavity Systems Based on the Continuity of Qubit Occupancy: Detecting Resonances to Higher Excited Qubit States
J. Phys. Soc. Jpn. 94, 014002 (2025), DOI: 10.7566/JPSJ.94.014002Yosuke Murayama, Akira Kawakami, Wenlei Shan, Shohei Ezaki, Akihira Miyachi, Sho Masui, Takafumi Kojima, Yoshinori Uzawa
Fabrication and Evaluation of Waveguide Josephson Array Oscillators at Millimeter-Wave Lengths for SIS Mixer-Based Amplifiers
IEEE Transactions on Applied Superconductivity 35, 2400306 (2024), DOI: 10.1109/TASC.2024.3515971Satoru Odate, Naooki Saito, Hajime Aoyama, Hiroyuki Tsukamoto, Koichi Kusuyama, Yasunobu Nakamura
Fabrication of superconducting quantum circuits on 12-inch wafers using an ArF immersion lithography system Ⅱ
Proc. SPIE 13115, UV and Higher Energy Photonics: From Materials to Applications 2024, 1311508Tomohisa Miyao, Keito Yoshinaga, Takahisa Tanaka, Hiroki Ishikuro, Munehiro Tada, Ken Uchida
Imaginary impedance due to hopping phenomena and evaluation of dopant ionization time in cryogenic metal-oxide-semiconductor devices on highly doped substrate
Appl. Phys. Express 17, 051001(2024), DOI: 10.35848/1882-0786/ad3d2aHideaki Numata, Noriyuki Iguchi, Masamitsu Tanaka, Koichiro Okamoto, Sadahiko Miura, Ken Uchida, Hiroki Ishikuro, Toshitsugu Sakamoto, Munehiro Tada
Superconducting Nb interconnects for Cryo-CMOS and superconducting digital logic applications
Jpn. J. Appl. Phys. 63, 04SP73(2024), DOI: 10.35848/1347-4065/ad37c1Yoshinori Uzawa, Akira Kawakami, Takafumi Kojima,Kazumasa Makise, Sho Masui, Akihira Miyachi, Yosuke Murayama,Yuto Kozuki, Wenlei Shan
Development of a Waveguide Josephson Oscillator for SIS Mixer-Based Amplifiers
IEEE Transactions on Applied Superconductivity 34, 2400205 (2024), DOI: 10.1109/TASC.2024.3358780Daisuke Iyama, Takahiko Kamiya, Shiori Fujii, Hiroto Mukai, Yu Zhou, Toshiaki Nagase, Akiyoshi Tomonaga, Rui Wang, Jiao-Jiao Xue, Shohei Watabe, Sangil Kwon, Jaw-Shen Tsai
Observation and manipulation of quantum interference in a superconducting Kerr parametric oscillator
Nat. Commun 15, 86 (2024), DOI: 10.1038/s41467-023-44496-1Chia-Wei Pai, Ken Uchida, Munehiro Tada, Hiroki Ishikuro
Design and analysis of a high-speed low-power comparator with regeneration enhancement and through current suppression techniques from 4 K to 300 K in 65-nm Cryo-CMOS
Microelectronics Journal 144, C (2023), DOI: 10.1016/j.mejo.2023.106066Munehiro Tada, Koichiro Okamoto, Takahisa Tanaka, Makoto Miyamura, Hiroki Ishikuro, Ken Uchida, Toshitsugu Sakamoto
A 65nm Cryogenic CMOS Design and Performance at 4.2K for Quantum State Controller Application
IEEE Journal of the Electron Devices Society 12, 28 (2023), DOI: 10.1109/JEDS.2023.3340136Teruaki Yoshioka, Hiroto Mukai, Akiyoshi Tomonaga, Shintaro Takada, Yuma Okazaki, Nobu-Hisa Kaneko, Shuji Nakamura, Jaw-Shen Tsai
Active initialization experiment of a superconducting qubit using a quantum circuit refrigerator
Phys. Rev. Applied 20, 044077(2023), DOI: 10.1103/PhysRevApplied.20.044077Yosuke Ueno, Yuna Tomida, Teruo Tanimoto, Masamitsu Tanaka, Yutaka Tabuchi, Koji Inoue, Hiroshi Nakamura
Inter-Temperature Bandwidth Reduction in Cryogenic QAOA Machines
IEEE Computer Architecture Letters 23, 9 (2023), DOI: 10.1109/LCA.2023.3322700Satoru Odate, Naooki Saito, Kosuke Suzuki, Hajime Aoyama, Hiroyuki Tsukamoto, Koichi Kusuyama, Yasunobu Nakamura
Fabrication of superconducting quantum circuits on 12-inch wafers using an ArF immersion lithography system
Proc. SPIE 12652, UV and Higher Energy Photonics: From Materials to Applications 2023, 1265205Shimpei Goto, Kazuki Koshino
Efficient numerical approach for the simulations of high-power dispersive readout with time-dependent unitary transformation
Phys. Rev. A 108, 033722 (2023), DOI: 10.1103/PhysRevA.108.033722Kaoru Yamashita, Benjamin Hershberg, Kentaro Yoshioka, Hiroki Ishikuro
A 4.6K to 400K Functional PVT-Robust Ringamp-Based 250MS/s 12b Pipelined ADC with Pole-Aware Bias Calibration
2023 IEEE Custom Integrated Circuits Conference (CICC), TX, USA, 2023, pp.740-752Julia Zotova, Rui Wang, Alexander Semenov, Yu Zhou, Ivan Khrapach, Akiyoshi Tomonaga, Oleg Astafiev, Jaw-Shen Tsai
Compact Superconducting Microwave Resonators Based on Al-AlO x -Al Capacitors
Phys. Rev. Applied 19, 044067 (2023), DOI: 10.1103/PhysRevApplied.19.044067Sho Masui, Takafumi Kojima, Yoshinori Uzawa, Kazumasa Makise, Hideo Ogawa, Toshikazu Onishi
Proof-of-Concept Experiment on a Wideband Microwave Gyrator with Two Superconductor– Insulator–Superconductor-Based Mixers
IEEE Transactions on Applied Superconductivity 33, 1501204 (2023), DOI: 10.1109/TASC.2023.3258368Sho Masui, Takafumi Kojima, Yoshinori Uzawa, Toshikazu Onishi
A Novel Microwave Nonreciprocal Isolator Based on Frequency Mixers
IEEE Microwave and Wireless Technology Letters 33, 1051 (2023), DOI: 10.1109/LMWT.2023.3253124Yoshinori Uzawa, Takafumi Kojima, Kazumasa Makise, Akira Kawakami, Yuto Kozuki, Sho Masui, Wenlei Shan
Development of an SIS Mixer-Based Low-Noise Amplifier Amenable to Josephson Oscillator Pumping
IEEE Transactions on Applied Superconductivity 33,1500804 (2023), DOI: 10.1109/TASC.2023.3254496Kosuke Mizuno, Takaaki Takenaka, Imran Mahboob, Shiro Saito
Effect of decoherence for gate operations on a superconducting bosonic qubit
New J. Phys. 25, 033007 (2023), DOI: 10.1088/1367-2630/acc02eMasamitsu Tanaka, Yoshihiro Kitagawa, Tetsuro Satoh, Tsuyoshi Yamamoto
Design and Fabrication of Low-Power Single-Flux-Quantum Circuits Toward Quantum Bit Control
IEEE Transactions on Applied Superconductivity 33, 1700805 (2023), DOI: 10.1109/TASC.2023.3251304Ivan Iakoupov, Kazuki Koshino
Saturable Purcell filter for circuit quantum electrodynamics
Phys. Rev. Research 5, 013148 (2023), DOI: 10.1103/5.013148Takafumi Kojima, Sho Masui, Wenlei Shan, Yoshinori Uzawa
Characterization of a low-noise superconductor–insulator–superconductor-based microwave amplifier with local oscillator phase-adjusting architecture
Appl. Phys. Lett. 122, 072601 (2023), DOI: 10.1063/5.0134595Gopika Lakshmi Bhai, Hiroto Mukai, Jaw-Shen Tsai
Mitigation of noise in Josephson parametric oscillator by injection locking
Appl. Phys. Lett. 122, 054002 (2023), DOI: 10.1063/5.0134702Gopika Lakshmi Bhai, Hiroto Mukai, Tsuyoshi Yamamoto, Jaw-Shen Tsai
Noise Properties of a Josephson Parametric Oscillator
Phys. Rev. Applied.19, 014065 (2023), DOI: 10.1103/PhysRevApplied.19.014065Leonid V. Abdurakhimov, Imran Mahboob, Hiraku Toida, Kosuke Kakuyanagi, Yuichiro Matsuzaki, Shiro Saito
Identification of Different Types of High-Frequency Defects in Superconducting Qubits
PRX Quantum 3, 040332 (2022), DOI: 10.1103/PRXQuantum.3.040332Koichiro Okamoto, Takahisa Tanaka, Makoto Miyamura, Hiroki Ishikuro, Ken Uchida, Toshitsugu Sakamoto, Munehiro Tada
Cryogenic operation of NanoBridge at 4 K for controlling qubit
Jpn. J. Appl. Phys. 61, SC1049 (2022), DOI: 10.35848/1347-4065/ac4303Sangil Kwon, Shohei Watabe, Jaw-Shen Tsai
Autonomous Quantum Error Correction in a Four-Photon Kerr Parametric Oscillator
npj Quantum Inf. 8, 40 (2022), DOI: 10.1038/s41534-022-00553-zZhi-Peng Yang, Alakesh Baishya, Huan-Yu Ku, Yu-Ran Zhang, Anton Frisk Kockum, Yueh-Nan Chen, Fu-Li Li, Jaw-Shen Tsai, Franco Nori
Deterministic One-way Logic Gates on a Cloud Quantum Computer
Phys. Rev. A 105, 042610 (2022), DOI: 10.1103/PhysRevA.105.042610Sishi Wu, Dengke Zhan, Rui Wang, Yulong Liu, Shuai-Peng Wang, Qichun Liu, J S Tsai, Tiefu Li
Vacuum-gap-based lumped element Josephson parametric amplifier
Chinese Phys. B 31, 010306 (2022), DOI: 10.1088/1674-1056/ac280cAkiyoshi Tomonaga, Hiroto Mukai, Fumiki Yoshihara, Jaw-Shen Tsai
Quasiparticle Tunneling and 1/f Charge Noise in Ultrastrongly Coupled Superconducting Qubit and Resonator
Phys. Rev. B 104, 224509 (2021), DOI: 10.1103/PhysRevB.104.224509Takafumi Miyanaga, Akiyoshi Tomonaga, Hikaru Ito, Hiroto Mukai, Jaw-Shen Tsai
Ultrastrong Tunable Coupler Between Superconducting LC Resonators
Phys. Rev. Applied 16, 064041 (2021), DOI: 10.1103/ PhysRevApplied.16.064041Teruaki Yoshioka, Jaw-Shen Tsai
Fast unconditional initialization for superconducting qubit and resonator using quantum-circuit refrigerator
Appl. Phys. Lett. 119, 124003 (2021), DOI: 10.1063/5.0057894Dengke Zhang, Jaw-Shen Tsai
Magnetic-Free Traveling-Wave Nonreciprocal Superconducting Microwave Components
Phys. Rev. Applied 15, 064013 (2021), DOI: 10.1103/PhysRevApplied.15.064013ULVAC, Inc.
Industry-Academia-Government Collaboration – Toward Technological Innovation for Quantum Computers
ULVAC VALUE REPORT 2022, 2022/11/30Shiro Saito, Hiroki Takei
About NTT's quantum information technology research
Telecommunications September 2022Tsuyoshi Yamamoto, Takahiro Mori
Research and Development of Quantum Computers Based on Superconductor and Semiconductor Devices
IEEJ Electronic Library, 2022/5/1Masamitsu Tanaka, Yuki Yamanashi
Current Status and Issues of Superconductor Peripheral Circuits for Quantum Computers
IEEJ Electronic Library, 2022/5/1L. V. Abdurakhimov, Imran Mahboob, HirakuToida, Kosuke Kakuyanagi, Shiro Saito