Papers - YAMANASHI Yuki
about 150-
Small-Area Sorting Network Based on Unary Coding Using Single Flux Quantum Circuits
Z. Han, N. Yoshikawa, and Y. Yamanashi
IEEE Trans. Appl. Supercond. 35 ( 5 ) 1400205 2025.8 [Reviewed]
Authorship：Last author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Large fan-out single-flux-quantum stochastic number splitter utilizing frequency-synchronized superconductor random number generators
K. Asaka, N. Yoshikawa, and Y. Yamanashi
Supercond. Sci. Technol. 38 ( 4 ) 045009 2025.4 [Reviewed]
Authorship：Last author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Single Work
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Research Trends in Hardware Implementation for Neuromorphic Circuit
Yamanashi Yuki
IEEJ Transactions on Fundamentals and Materials 145 ( 1 ) 19 - 20 2025.1 [Reviewed] [Invited]
Authorship：Lead author, Last author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Institute of Electrical Engineers of Japan Single Work
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4-bit Factorization Circuit Composed of Multiplier Units with Superconducting Flux Qubits toward Quantum Annealing
D. Saida, M. Hidaka, and Y. Yamanashi
IEEE Trans. Appl. Supercond. 35 ( 1 ) 1700111 2025.1 [Reviewed]
Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Single Work
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Stochastic matrix multiplier using superconductor single-flux-quantum circuit
Y. Yamanashi, H. Okumura, and N. Yoshikawa
Supercond. Sci. Technol. 37 ( 11 ) 115024 2024.11 [Reviewed]
Authorship：Lead author, Last author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Single Work
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Implementation of Bayesian Network Based on Ultra-High-Speed Superconductor Random Number Generators
Rikuo Yamanaka, Nobuyuki Yoshikawa, Yuki Yamanashi
IEEE Access 12 129081 - 129086 2024.8 [Reviewed]
Authorship：Last author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Single Work
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A binary neural computing unit with programmable gate using SFQ and CMOS hybrid circuit
Z. Li, H. Shen, N. Yoshikawa, and Y. Yamanashi
Supercond. Sci. Technol. 37 ( 6 ) 065012 2024.6 [Reviewed]
Authorship：Last author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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High area efficiency binary neural processing elements with time-domain signals using SFQ circuits
Z. Han, Z. Li, N. Yoshikawa, and Y. Yamanashi
Supercond. Sci. Technol. 37 ( 4 ) 045014 2024.4 [Reviewed]
Authorship：Last author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Single Work
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Adiabatic Quantum-Flux-Parametron Boosters for Long Interconnection and Large Fanouts
N. Mizushima, N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
Supercond. Sci. Technol. 36 ( 11 ) 115021 2023.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Amplitude-controllable microwave pulse generator using single-flux-quantum pulse pairs for qubit control
Shen Hongxiang, Takeuchi Naoki, Yamanashi Yuki, Yoshikawa Nobuyuki
Supercond. Sci. Technol. 36 ( 9 ) 2023.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Transition and Prospects of Superconducting Integrated Electronics
YAMANASHI Yuki
The Journal of The Institute of Electrical Engineers of Japan 143 ( 9 ) 584 - 587 2023.9 [Reviewed] [Invited]
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Institute of Electrical Engineers of Japan Single Work
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Asynchronous Single Flux Quantum Logic Gates Using Self-Clocking
Yamanashi Yuki, Fujisawa Taisei, Li Zongyuan, Yoshikawa Nobuyuki
IEEE Trans. Appl. Supercond. 33 ( 5 ) 2023.8 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Design of Max Pooling Operation Circuit for Binarized Neural Networks Using Single-Flux-Quantum Circuit
Han Zeyu, Li Zongyuan, Yamanashi Yuki, Yoshikawa Nobuyuki
IEEE Trans. Appl. Supercond. 33 ( 5 ) 2023.8 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Design and Component Demonstration of an SFQ Complex Event Detector Corresponding to Regular Expressions
Suzuki Takuya, Akizuki Kazuma, Yamanashi Yuki, Yoshikawa Nobuyuki
IEEE Trans. Appl. Supercond. 33 ( 5 ) 2023.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Pulse-Density-Modulated Microwave Generator Using Single-Flux-Quantum Circuits for Controlling Qubits
Kunihiro Akira, Yamanashi Yuki, Yoshikawa Nobuyuki
IEEE Trans. Appl. Supercond. 33 ( 5 ) 2023.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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超伝導回路によるイジングモデルに基づいた論理ゲートの設計
山梨裕希, 三宅航平, 菅原瑠偉, 吉川信行
電子情報通信学会論文誌C J106-C ( 6 ) 249 - 257 2023.6 [Reviewed] [Invited]
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Single Work
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Y. Yamanashi, T. Hosoya, and N. Yoshikawa
Appl. Phys. Express 16 ( 4 ) 043002 2023.4 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
Other Link： https://iopscience.iop.org/article/10.35848/1882-0786/accc0a
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Demonstration of Single-Flux-Quantum 64-B Lookup Table With Cryo-CMOS Decoders for Reconfiguration
Hironaka Yuki, Hosoya Takuya, Yamanashi Yuki, Yoshikawa Nobuyuki
IEEE Trans. Appl. Supercond. 32 ( 8 ) 2022.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Design and Demonstration of a Superconducting Field-Programmable Gate Array Using Adiabatic Quantum-Flux-Parametron Logic and Memory
Takahashi Daichi, Takeuchi Naoki, Yamanashi Yuki, Yoshikawa Nobuyuki
IEEE Trans. Appl. Supercond. 32 ( 7 ) 2022.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Transmission Line Effects of Long Gate-to-Gate Interconnections in Adiabatic Quantum-Flux-Parametron Logic Circuits
Asai Kazuhito, Takeuchi Naoki, Suzuki Hideo, Yamanashi Yuki, Yoshikawa Nobuyuki
IEEE Trans. Appl. Supercond. 32 ( 7 ) 2022.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Superconducting quantum circuit of NOR in quantum annealing
Daisuke Saida, Mutsuo Hidaka, Kouhei Miyake, Kentaro Imafuku, Yuki Yamanashi
Scientific Reports 12 ( 1 ) 15894 2022.9 [Reviewed]
Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Factorization by quantum annealing using superconducting flux qubits implementing a multiplier Hamiltonian
Daisuke Saida, Mutsuo Hidaka, Kentaro Imafuku, Yuki Yamanashi
Scientific Reports 12 ( 1 ) 15894 2022.8 [Reviewed]
Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Single Work
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CHINA Fumihiro, TAKEUCHI Naoki, SUZUKI Hideo, YAMANASHI Yuki, TERAI Hirotaka, YOSHIKAWA Nobuyuki
IEICE Trans. Electron. E105-C ( 6 ) 264 - 269 2022.6 [Reviewed]
DOI Web of Science CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers Joint Work
<p>The adiabatic quantum flux parametron (AQFP) is an energy-efficient, high-speed superconducting logic device. To observe the tiny output currents from the AQFP in experiments, high-speed voltage drivers are indispensable. In the present study, we develop a compact voltage driver for AQFP logic based on a Josephson latching driver (JLD), which has been used as a high-speed driver for rapid single-flux-quantum (RSFQ) logic. In the JLD-based voltage driver, the signal currents of AQFP gates are converted into gap-voltage-level signals via an AQFP/RSFQ interface and a four-junction logic gate. Furthermore, this voltage driver includes only 15 Josephson junctions, which is much fewer than in the case for the previously designed driver based on dc superconducting quantum interference devices (60 junctions). In measurement, we successfully operate the JLD-based voltage driver up to 4 GHz. We also evaluate the bit error rate (BER) of the driver and find that the BER is 7.92×10<sup>-10</sup> and 2.67×10<sup>-3</sup> at 1 GHz and 4 GHz, respectively.</p>
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Z. Li, Y. Yamanashi, N. Yoshikawa
IEEE Trans. Appl. Supercond. 32 ( 4 ) 130030 2022.6 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Boltzmann Machine Using Superconducting Circuits
K. Miyake, Y. Yamanashi, N. Yoshikawa
IEEE Trans. Appl. Supercond. 32 ( 4 ) 170020 2022.6 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Design of Discrete Hopfield Neural Network Using a Single Flux Quantum Circuit
H. He, Y. Yamanashi, N. Yoshikawa
IEEE Trans. Appl. Supercond. 32 ( 4 ) 130060 2022.6 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Shen Hongxiang, Takeuchi Naoki, Yamanashi Yuki, Yoshikawa Nobuyuki
電気学会論文誌Ａ 142 ( 5 ) 197 - 201 2022.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：一般社団法人 電気学会 Joint Work
<p>We are developing a microwave pulse generator, whose pulse width and amplitude can be arbitrarily controlled, to manipulate superconducting quantum computing systems. The proposed microwave pulse generator is made using superconducting circuits. It can be placed at a 4.2 K or lower temperature stages to control a large-scale quantum computing system effectively. One of the key components of the microwave pulse generator is the timing controller, which generates trigger pulses for the microwave switch to start and stop the microwave irradiation. The target frequency of the microwave is 5 GHz, and the timing controller has to generate trigger pulses with a time resolution of several nanoseconds. We designed a 4-bit timing controller using an adiabatic quantum flux parametron (AQFP) circuit, which is extremely energy-efficient superconducting logic. The designed timing controller derives two trigger pulses, start and stop, to the microwave switch at the timing designated by digital data. We implemented the AQFP timing controller using the AIST HSTP process and demonstrated its operation at 1 GHz. Its power dissipation was estimated as about 1.25×10<sup>-9</sup> W at 1 GHz.</p>
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Current Status and Issues of Superconductor Peripheral Circuits for Quantum Computers
Tanaka Masamitsu, Yamanashi Yuki
IEEJ Transactions on Fundamentals and Materials 142 ( 5 ) 175 - 182 2022.5 [Reviewed]
Authorship：Last author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Institute of Electrical Engineers of Japan Joint Work
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Frequency synchronization of single flux quantum oscillators
Y. Yamanashi, R. Kinoshita, N. Yoshikawa
Supercond. Sci. Technol. 34 ( 10 ) 105004 - 105004 2021.10 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Planarized Nb 4-Layer Fabrication Process for Superconducting Integrated Circuits and Its Fabricated Device Evaluation
S. Nagasawa, M. Tanaka, N. Takeuchi, Y. Yamanashi, S. Miyajima, F. China, T. Yamae, K. Yamazaki, Y. … Show more authors
S. Nagasawa, M. Tanaka, N. Takeuchi, Y. Yamanashi, S. Miyajima, F. China, T. Yamae, K. Yamazaki, Y. Somei, N. Sega, Y. Mizugaki, H. Myoren, H. Terai, M. Hidaka, N. Yoshikawa, A. Fujimaki Hide authors
IEICE Trans. Electron. E104-C ( 9 ) 435 - 445 2021.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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L. Shirakawa, Y. Yamanashi, N. Yoshikawa
IEEE Trans. Appl. Supercond. 31 ( 5 ) 1300604-1 - 1300604-5 2021.8 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Experimental Demonstrations of Native Implementation of Boolean Logic Hamiltonian in a Superconducting Quantum Annealer
D. Saida, Y. Yamanashi, M. Hidaka, F. Hirayama, K. Imafuku, S. Nagasawa, S. Kawabata
IEEE Transactions on Quantum Engineering 2 3103508 2021.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Characterization of energy potential in tunable rf-SQUIDs with the classical regime toward precise design of superconducting flux qubit
D. Saida, N. Watase, and Y. Yamanashi
Jpn. J. Appl. Phys. 60 ( 6 ) 060906-1 - 060906-51 2021.6 [Reviewed]
Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Joint Work
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S.Asada, Y. Yamanashi, N. Yoshikawa
Supercond. Sci. Technol. 34 ( 5 ) 055007 2021.5 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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T. Hosoya, Y. Yamanashi, N. Yoshikawa
IEEE Trans. Appl. Supercond. 31 ( 3 ) 1300406-1 - 1300406-6 2021.4 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Demonstration of a Single-Flux-Quantum Microprocessor Operating With Josephson-CMOS Hybrid Memory
Y. Hironaka, Y. Yamanashi, N. Yoshikawa
IEEE Trans. Appl. Supercond. 30 ( 7 ) 1301206 2020.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Investigation of the Effects of 1/f Noise on Superconducting Circuits
Y. Tsuna, Y. Yamanashi, N. Yoshikawa
IEEE Trans. Appl. Supercond. 30 ( 7 ) 1400404 2020.10 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Y. Okuma, N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 29 ( 8 ) 1103606 2019.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Measurement of Single-Flux-Quantum Floating-Point Divider Based on Goldschmidt's Algorithm
Yamanashi Yuki, Sanada Akiyoshi, Yoshikawa Nobuyuki
2019 IEEE INTERNATIONAL SUPERCONDUCTIVE ELECTRONICS CONFERENCE (ISEC) 2019.8 [Reviewed]
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Simulation of the Margins in Single Flux Quantum Circuits Containing π-Shifted Josephson Junctions
Y. Yamanashi, S. Nakaishi, and N. Yoshikawa,
IEEE Trans. Appl. Supercond. 29 ( 5 ) 1301805 2019.8 [Reviewed] [Invited]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Study on Single Flux Quantum Floating-Point Divider Based on Goldschmidt's Algorithm
A. Sanada, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 29 ( 5 ) 13019045 2019.8 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Demonstration of Picosecond Time Resolution in Double-Oscillator Time-to-Digital Converter using Single-Flux-Quantum Circuits
Y. Tomitsuka, Y. Yamanashi, N. Zen, M. Ohkubo, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 29 ( 5 ) 1301505 2019.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Miniaturization of adiabatic quantum-flux-parametron circuits by adopting offset buffer
Y. Okuma, N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
Superconductor. Sci. Technol. 32 ( 6 ) 065007 2019.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Influence of Magnetic Flux Trapped in Moats on Superconducting Integrated Circuit Operation
Y. Yamanashi, H. Imai, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 28 ( 7 ) 1301105 2018.10 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Y. Yamanashi, S. Nakaishi, A. Sugiyama, N. Takeuchi, and N. Yoshikawa
Supercond. Sci. Technol. 31 ( 10 ) 105003 2018.8 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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A random-access-memory cell based on quantum flux parametron with three control lines
H. Takayama, N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
J. Phys. Conf. Ser. 1054 012063 2018.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Recent Progress on Reversible Quantum-Flux-Parametron for Superconductor Reversible Computing
N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
IEICE Trans. Electron. E101-C ( 5 ) 352 - 358 2018.5 [Reviewed] [Invited]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEICE Joint Work
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YOSHIKAWA Nobuyuki, SANO Kyosuke, YAMANASHI Yuki, ZEN Nobuyuki, OHKUBO Masataka
TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 52 ( 5 ) 349 - 354 2017.10 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN Joint Work
We have been developing superconducting time-of-flight mass spectrometry (TOF-MS) systems that utilize a superconducting strip particle detector (SSPD) and a single-flux-quantum (SFQ) time-to-digital converter (TDC). The SSPD has high time resolution and constant detection efficiency even for high-mass molecules. The SFQ TDC can measure the time intervals between multiple input signals with extremely high time resolution and directly convert them into binary data. In this paper, we review recent developments on the superconducting TOF-MS systems in our group.
Other Link： https://ci.nii.ac.jp/naid/130006183702
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Development and Demonstration of Routing and Placement EDA Tools for Large-Scale Adiabatic Quantum-Flux-Parametron Circuits
Y. Murai, C.L. Ayala, N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 27 ( 6 ) 1302209 2017.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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High-Speed Superconductive Decimation Filter for Sigma-Delta Analog to Digital Converter
T. Wakamatsu, Y. Yamanashi, and N. Yoshikawa
J. Phys. Conf. Ser. 871 012068 2017.7 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Evaluation of Current Sensitivity of Quantum Flux Parametron
Y. Yamanashi, T. Matsushima, N. Takeuchi, N. Yoshikawa, and T. Ortlepp
Supercond. Sci. Technol. 30 ( 8 ) 084004 2017.7 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD Joint Work
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Demonstration of Signal Transmission Between Adiabatic Quantum-Flux-Parametrons and Rapid Single-Flux-Quantum Circuits Using Superconductive Microstrip Lines
F. China, N. Tsuji, T. Narama, T. Ortlepp, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 27 ( 4 ) 1300205 2017.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC Joint Work
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Design and Implementation of a 16-Word by 1-Bit Register File Using Adiabatic Quantum Flux Parametron Logic
T. Tsuji, C. L. Ayala, N. Takeuchi, T. Ortlepp, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 27 ( 4 ) 1300904 2017.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC Joint Work
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Fully Functional Operation of Low-Power 64-kb Josephson-CMOS Hybrid Memories
G. Konno, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 27 ( 4 ) 1300607 2017.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC Joint Work
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Majority-Logic-Optimized Parallel Prefix Carry Look-Ahead Adder Families Using Adiabatic Quantum-Flux-Parametron Logic
C. Ayala, N. Takeuchi, Y. Yamanashi, T. Ortlepp, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 27 ( 4 ) 1300407 2017.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC Joint Work
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Reduction of the Supply Current of Single-Flux-Quantum Time-to-Digital Converters by Current Recycling Techniques
K. Sano, T. Shimoda, Y. Abe, Y. Yamanashi, N. Yoshikawa, N. Zen, and M. Ohkubo
IEEE Trans. Appl. Supercond. 27 ( 4 ) 1300305 2017.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC Joint Work
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Synthesis Flow for Cell-Based Adiabatic Quantum-Flux-Parametron Structural Circuit Generation With HDL Back-End Verification
Q. Xu, C. Ayala, N. Takeuchi, Y. Murai, Y, Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 27 ( 4 ) 1301905 2017.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC Joint Work
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Three-dimensional adiabatic quantum-flux-parametron fabricated using a double-active-layered niobium process
T. Ando, S. Nagasawa, N. Takeuchi, N. Tsuji, F. China, M. Hidaka, Y. Yamanashi, and N. Yoshikawa
Supercond. Sci. Technol. 30 ( 7 ) 075003 2017.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD Joint Work
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Design and Implementation of an SFQ-Based Single-Chip FFT Processor
Ono Tomohiro, Suzuki Hideo, Yamanashi Yuki, Yoshikawa Nobuyuki
IEEE Trans. Appl. Supercond. 27 ( 4 ) 2017.6 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Multi-excitation adiabatic quantum-flux-parametron
Fang Kun, Takeuchi Naoki, Ando Takumi, Yamanashi Yuki, Yoshikawa Nobuyuki
J. Appl. Phys. 121 ( 14 ) 2017.4 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Adiabatic quantum-flux-parametron cell library designed using a 10 kA cm-2 niobium fabrication process
N. Takeuchi, S. Nagasawa, F. China, T. Ando, M. Hidaka, Y. Yamanashi, and N. Yoshikawa
Supercond. Sci. Technol. 30 ( 3 ) 035002 2017.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD Joint Work
Adiabatic quantum-flux-parametron (AQFP) logic is an energy-efficient superconductor logic with zero static power consumption and very small switching energy. In this paper, we report a new AQFP cell library designed using the AIST 10 kA cm(-2) Nb high-speed standard process (HSTP), which is a high-critical-current-density version of the AIST 2.5 kA cm(-2) Nb standard process (STP2). Since the intrinsic damping of the Josephson junction (JJ) of HSTP is relatively strong, shunt resistors for JJs were removed and the energy efficiency improved significantly. Also, excitation transformers in the new cells were redesigned so that the cells can operate in a four-phase excitation mode. We described the detail of HSTP and the AQFP cell library designed using HSTP, and showed experimental results of cell test circuits.
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Reversibility and energy dissipation in adiabatic superconductor logic
N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
Sci. Rep. 7 75 2017.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Adiabatic Quantum-Flux-Parametron Constant Cells using Asymmetrical Structures
Takumi ANDO,Naoki TAKEUCHI,Yuki YAMANASHI,Nobuyuki YOSHIKAWA
Journal of the Institute of Electorical Engineers of Japan 136 ( 12 ) 747 - 752 2016.12 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Institute of Electrical Engineers of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/ieejfms/136/12/136_747/_article/-char/ja/?from=J-GLOBAL
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Research Progress of Low-power Superconducting Integrated Circuits
Yuki YAMANASHI, Naoki TAKEUCHI,Nobuyuki YOSHIKAWA
Journal of the Institute of Electorical Engineers of Japan 136 ( 12 ) 734 - 739 2016.12 [Reviewed] [Invited]
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Institute of Electorical Engineers of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/ieejfms/136/12/136_734/_article/-char/ja/?from=J-GLOBAL
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HDL-Based Modeling Approach for Digital Simulation of Adiabatic Quantum Flux Parametron Logic
Q. Xu, C. L. Ayala, N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 26 ( 8 ) 1301805 2016.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Power Reduction of Josephson Random Access Memory Using Stochastic Resonance
R. Kihara, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 26 ( 8 ) 1301704 2016.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Joint Work
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R. Tsutsumi, K. Sato, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 26 ( 8 ) 1301405 2016.12 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC Joint Work
We propose a new inductive-and resistive- (LR) biased low-power single-flux quantum (SFQ) circuit that has a dynamic resetting mechanism of the bias current. Because the bias current returns to the initial state rapidly by switching of a Josephson junction in the bias circuit after circuit operation, the operating frequency of the LR-biased SFQ circuit can be improved. We simulated a Josephson transmission line (JTL) that employs the proposed biasing scheme and evaluated the bias current recovery time. Circuit simulation results show that the bias current recovery time of the proposed circuit is improved by 10-20% compared to that of the conventional LR-biased JTL. We have designed and measured a 10-stage JTL and an 8-bit concurrent-flow shift register (SR) with the proposed biasing scheme. We have experimentally demonstrated operation of the JTL with the bias margin of +/- 29.4% at the operating frequency of up to 70.4 GHz and operation of the 8-bit SR up to 12.3 GHz by the on-chip high-speed test.
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Y. Yamanashi, K. Masubuchi, and N. Yoshikawa
Physica C 530 101 - 103 2016.11 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV Joint Work
The relationship between the timing margin and the error rate of the large-scale single flux quantum logic circuits is quantitatively investigated to establish a timing design guideline. We observed that the fluctuation in the set-up/hold time of single flux quantum logic gates caused by thermal noises is the most probable origin of the logical error of the large-scale single flux quantum circuit. The appropriate timing margin for stable operation of the large-scale logic circuit is discussed by taking the fluctuation of setup/hold time and the timing jitter in the single flux quantum circuits. As a case study, the dependence of the error rate of the 1-million-bit single flux quantum shift register on the timing margin is statistically analyzed. The result indicates that adjustment of timing margin and the bias voltage is important for stable operation of a large-scale SFQ logic circuit. (C) 2016 Elsevier B.V. All rights reserved.
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Design and Demonstration of Interface Circuits between Rapid Single-Flux-Quantum and Adiabatic Quantum-Flux-Parametron Circuits
F. China, T. Narama, N. Takeuchi, T. Ortlepp, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 26 ( 5 ) 1301305 2016.8 [Reviewed] [Invited]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Joint Work
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Y. Yamanashi, S. Nishimoto, and N. Yoshikawa
IEICE Trans. Electron. E99-C ( 6 ) 692 - 696 2016.6 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, Joint Work
A single-flux-quantum (SFQ) arithmetic logic unit (ALU) was designed and tested to evaluate the effectiveness of introducing dynamically reconfigurable logic gates in the design of a superconducting logic circuit. We designed and tested a bit-serial SFQ ALU that can perform six arithmetic/logic functions by using a dynamically reconfigurable AND/OR gate. To ensure stable operation of the ALU, we improved the operating margin of the SFQ AND/OR gate by employing a partially shielded structure where the circuit is partially surrounded by under-and over-ground layers to reduce parasitic inductances. Owing to the introduction of the partially shielded structure, the operating margin of the dynamically reconfigurable AND/OR gate can be improved without increasing the circuit area. This ALU can be designed with a smaller circuit area compared with the conventional ALU by using the dynamically reconfigurable AND/OR gate. We implemented the SFQ ALU using the AIST 2.5 kA/cm(2) Nb standard process 2. We confirmed high-speed operation and correct reconfiguration of the SFQ ALU by a high-speed test. The measured maximum operation frequency was 30 GHz.
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Majority Gate-Based Feedback Latches for Adiabatic Quantum Flux Parametron Logic
N. Tsuji, N. Takeuchi, Y. Yamanashi, T. Ortlepp, and N. Yoshikawa
IEICE Trans. Electron. E99-C ( 6 ) 710 - 716 2016.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, Joint Work
We have studied ultra-low-power superconductor circuits using adiabatic quantum flux parametron (AQFP) logic. Latches, which store logic data in logic circuits, are indispensable logic elements in the realization of AQFP computing systems. Among them, feedback latches, which hold data by using a feedback loop, have advantages in terms of their wide operation margins and high stability. Their drawbacks are their large junction counts and long latency. In this paper, we propose a majority gate-based feedback latch for AQFP logic with a reduced number of junctions. We designed and fabricated the proposed AQFP latches using a standard National Institute of Advanced Industrial Science and Technology (AIST) process. The measurement results showed that the feedback latches operate with wide operation margins that are comparable with circuit simulation results.
Other Link： https://www.jstage.jst.go.jp/article/transele/E99.C/6/E99.C_710/_article?from=J-GLOBAL
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High-speed demonstration of low-power 1k-bit shift-register memories using LR-biasing SFQ circuits
T. Takahashi, R. Numaguchi, Y. Yamanashi, and N. Yoshikawa,
IEICE Electron. Express 13 ( 6 ) 20160074 2016.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG Joint Work
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Magnetically coupled quantum-flux-latch with wide operation margins
N.Tsuji, N. Takeuchi, T. Narama, T. Ortlepp, Y. Yamanashi, and N. Yoshikawa
Supercond. Sci. Technol. 28 ( 11 ) 115013 2015.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD, Joint Work
We have been developing adiabatic quantum-flux-parametron (AQFP) circuits as an ultra-low-power superconductor logic for energy-efficient computing. In a previous study, we proposed and demonstrated a quantum-flux-latch (QFL), which is a compact and compatible latch for AQFP logic. The QFL is composed of an AQFP buffer gate and a storage loop, which are directly connected to each other. However, the operation margins were not sufficiently wide due to a trade-off between the operation margins of the storage loop and that of the buffer gate. In this present study, we propose a magnetically coupled QFL (MC-QFL), where the storage loop and the buffer gate are physically separated and magnetically coupled to each other to eliminate the trade-off in the operation margins. The simulation results showed that the critical parameter margin of the MC-QFL is twice as large as that of the previously designed QFL. For comparison, we fabricated and demonstrated both the previously designed QFL and the newly designed MC-QFL. The measurement results showed that the MC-QFL has wider operation margins compared with the previously designed QFL.
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Thermodynamic Study of Energy Dissipation in Adiabatic Superconductor Logic
N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
Phys. Rev. Appl. 4 ( 3 ) 034007 2015.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC Joint Work
Because of its extremely high energy efficiency, adiabatic superconductor logic is one of the most promising candidates for the realization of a practical reversible computer. In a previous study, we proposed a logically and physically reversible logic gate using adiabatic superconductor logic, and numerically demonstrated reversible computing. In the numerical calculation, we assumed that the average energy dissipation at finite temperature corresponds to that at zero temperature. However, how the phase difference of a Josephson junction in adiabatic superconductor logic behaves at finite temperature is not yet well understood, and whether thermal noise can induce a nonadiabatic state change remains unclear. In the present study, we investigate energy dissipation in adiabatic superconductor logic at finite temperature through numerical analyses using the Monte Carlo method. We investigate the average and standard deviation of the energy dissipation through both numerical calculation and analytical estimation. Finally, we discuss the minimum energy dissipation required for adiabatic switching operations.
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Demonstration of single-flux-quantum readout circuits for time-of-flight mass spectrometry systems using superconducting strip ion detectors
K. Sano, Y Takahashi, Y Yamanashi, N Yoshikawa, N Zen, M Ohkubo
Supercond. Sci. Technol. 28 ( 7 ) 074003,1 - 5 2015.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD Joint Work
We have been developing a superconducting time-of-flight mass spectrometry (TOF-MS) system that consists of a superconducting strip ion detector (SSID) and a single-flux-quantum (SFQ) time-to-digital converter. In this study, we implement a prototype TOF-MS system using an SSID and an SFQ readout circuit in which output signals from the SSID are read out by the SFQ readout circuit and output to room-temperature electronics. The SFQ readout circuit, which consists of a current discriminator, a Josephson transmission line and an SFQ/dc converter, was fabricated using the AIST Nb standard process (STP2), and installed in a 4.2 K cryostat with a meander-shaped NbN SSID measuring 200 mu m square. The dark count rate for the SSID was measured as increasing exponentially with the increase in the bias current of the SSID by using the SFQ readout circuit. Mass spectrum measurements of biomolecules, Angiotensin I, which has a molecular weight of 1296 Da, were demonstrated by using the matrix-assisted laser desorption/ionization method, and a clear corresponding peak was observed in the mass spectrum.
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Design Method of Single Flux Quantum Logic Circuits Using Dynamically Reconfigurable Logic Gates
S. Nishimoto, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 25 ( 3 ) 1301405 2015.6 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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High-Speed Operation of an SFQ Butterfly Processing Circuit for FFT Processors Using the 10 kA/cm2 Nb Process
Y. Sakashita, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 25 ( 3 ) 1301205 2015.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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High-Speed Demonstration of Bit-Serial Floating-Point Adders and Multipliers Using Single-Flux-Quantum Circuits
X. Peng, Q. Xu, T. Kato, Y. Yamanashi, N. Yoshikawa, A. Fujimaki, N. Takagi, K. Takagi, and M. Hida … Show more authors
X. Peng, Q. Xu, T. Kato, Y. Yamanashi, N. Yoshikawa, A. Fujimaki, N. Takagi, K. Takagi, and M. Hidaka Hide authors
IEEE Trans. Appl. Supercond. 25 ( 3 ) 1301106 2015.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
We have been developing a large-scale reconfigurable data path (LSRDP) based on single-flux-quantum (SFQ) circuit technology for high-performance computing systems. In the SFQ LSRDP, a large number of SFQ floating-point adders (FPAs) and floating-point multipliers (FPMs) are directly connected to each other through routing networks to reduce a memory access rate. In this paper, we show our recent results about the SFQ FPAs and FPMs. Utilization of the National Institute of Advanced Industrial Science and Technology's 10-kA/cm(2) Nb process makes it possible to accelerate the clock frequency to more than 50 GHz. We successfully demonstrated the high-speed operation of single-precision FPAs and FPMs, whose clock frequency is beyond 50 GHz, by on-chip high-speed tests. We estimate the performance and energy efficiency of SFQ FPAs and FPMs based on the designed circuits. -
Experimental Demonstration of Quantum-Flux-Latch-Based Circuits
N. Takeuchi, T. Ortlepp, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 25 ( 3 ) 1300803 2015.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Demonstration of Bit-Serial SFQ-Based Computing for Integer Iteration Algorithms
Q. Xu, X. Peng, T. Ortlepp, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 25 ( 3 ) 1300704 2015.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
The Collatz conjecture asserts that by a repeated iteration rule, the operation starting from any positive integer n, eventually produces the value of "1." The main contribution of this paper is to demonstrate a single-flux-quantum (SFQ)-based hardware algorithm that performs an exhaustive search to verify the Collatz conjecture. The circuit consists of a 16-bit integer register, a high-frequency clock generator, and a central processor. This design can perform at up to a maximum clock frequency of 90 GHz with a total power consumption of about 0.85 mW in simulation, based on the AIST 10 kA/cm(2) advanced Nb process. An LR-biasing approach further reduces the power consumption, whereas the computing speed can be accelerated by a factor of 20 when accelerating approaches are adopted. The assessments show that our design can process 2 x 10(7) numbers every second with an energy efficiency of about 5 x 10(10) numbers per Joule.
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K. Sato, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 25 ( 3 ) 1301605 2015.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Adiabatic quantum-flux-parametron cell library adopting minimalist design
N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
J. Appl. Phys. 117 ( 17 ) 173912 2015.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：AMER INST PHYSICS, 1305 WALT WHITMAN RD Joint Work
We herein build an adiabatic quantum-flux-parametron (AQFP) cell library adopting minimalist design and a symmetric layout. In the proposed minimalist design, every logic cell is designed by arraying four types of building block cells: buffer, NOT, constant, and branch cells. Therefore, minimalist design enables us to effectively build and customize an AQFP cell library. The symmetric layout reduces unwanted parasitic magnetic coupling and ensures a large mutual inductance in an output transformer, which enables very long wiring between logic cells. We design and fabricate several logic circuits using the minimal AQFP cell library so as to test logic cells in the library. Moreover, we experimentally investigate the maximum wiring length between logic cells. Finally, we present an experimental demonstration of an 8-bit carry look-ahead adder designed using the minimal AQFP cell library and demonstrate that the proposed cell library is sufficiently robust to realize large-scale digital circuits. (C) 2015 AIP Publishing LLC.
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Design and demonstration of adiabatic quantum-flux-parametron logic circuits with superconductor magnetic shields
K. Inoue, N. Takeuchi, T. Narama, Y. Yamanashi, and N. Yoshikawa
Supercond. Sci. Technol. 28 ( 4 ) 045020 2015.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD Joint Work
Adiabatic quantum-flux-parametron (AQFP) logic is an energy-efficient superconductor logic with zero static power and very small dynamic power due to adiabatic switching operations. In order to build large-scale digital circuits, we built AQFP logic cells using superconductor magnetic shields, which are necessary in order to avoid unwanted magnetic couplings between the cells and excitation currents. In preliminary experimental tests, we confirmed that the unwanted coupling became negligibly small thanks to the superconductor shields. As a demonstration, we designed a four-to-one multiplexor and a 16-junction full adder using the shielded logic cells. In both circuits, we confirmed correct logic operations with wide operation margins of excitation currents. These results indicate that large-scale AQFP digital circuits can be realized using the shielded logic cells.
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50 GHz Demonstration of an Integer-Type Butterfly Processing Circuit for an FFT Processor Using the 10 kA/cm^2 Nb Process
Yosuke SAKASHITA, Yuki YAMANASHI, Nobuyuki YOSHIKAWA
IEICE Trans. Electron. E98-C ( 3 ) 232 - 237 2015.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEICE Joint Work
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Energiy efficiency of adiabatic superconductor logic
N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
Supercond. Sci. Technol. 28 ( 1 ) 015003 2015.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD Joint Work
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Reversible logic gate using adiabatic superconducting devices
N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
Sci. Rep. 4 6354 2014.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：NATURE PUBLISHING GROUP Joint Work
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K. Sano, Y. Muramatsu, Y. Yamanashi, N. Yoshikawa, N. Zen, and M. Ohkubo
Physica C 504 97 - 101 2014.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
Other Link： http://www.sciencedirect.com/science/article/pii/S0921453414000458?via%3Dihub
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D. Si, N. Takeuchi, K. Inoue, Y. Yamanashi, and N. Yoshikawa
Physica C 504 102 - 105 2014.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
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Optimization of SFQ logic gate considering dependence of its signal propagation delay on the bias voltage
M. Otsubo, Y. Yamanashi, and N. Yoshikawa
Physics Procedia 58 216 - 219 2014.9 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
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N. Takeuchi, T. Ortlepp, Y. Yamanashi, and N. Yoshikawa,
IEEE Trans. Appl. Supercond. 24 ( 4 ) 1300204 2014.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Memory Effect in Balanced Josephson Comparators
T. Ortlepp, M. Volkmann, and Y. Yamanashi
Physica C 500 20 - 24 2014.5 [Reviewed]
Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Y. Yamanashi and N. Yoshikawa
IEICE Trans. Electron. E97-C ( 3 ) 178 - 181 2014.3 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Design and Demonstration of a Single-Flux-Quantum Multi-Stop Time-to-Digital Converter for Time-of-Flight Mass Spectrometry
K. Sano, Y. Yamanashi, and N. Yoshikawa
IEICE Trans. Electron. E97-C ( 3 ) 182 - 187 2014.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Design and High-Speed Demonstration of Single-Flux-Quantum Bit-Serial Floating-Point Multipliers Using a 10kA/cm2 Nb Process
X. Peng, Y. Yamanashi, N. Yoshikawa, A. Fujimaki, N. Takagi, K. Takagi, and M. Hidaka
IEICE Trans. Electron. E97-C ( 3 ) 188 - 193 2014.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Novel latch for adiabatic quantum-flux-parametron logic
N. Takeuchi, T. Ortlepp, Y. Yamanashi, and N. Yoshikawa
J. Appl. Phys. 115 ( 10 ) 103910 2014.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Simulation of sub-kBT bit-energy operation of adiabatic quantum-flux-parametron logic with low bit-error-rate
N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
Appl. Phys. Lett. 103 062602 2013.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Operation of an Adiabatic Quantum-Flux-Parametron Gate Using an On-Chip AC Power Source
T. Mukaiyama, N. Takeuchi, K. Ehara, K. Inoue, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 23 ( 4 ) 131605 2013.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Margin and Energy Dissipation of Adiabatic Quantum-Flux-Parametron Logic at Finite Temperature
N. Takeuchi, K. Ehara, K. Inoue, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 23 ( 3 ) 1700304 2013.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Design and Implementation of 64-kb CMOS Static RAMs for Josephson-CMOS Hybrid Memories
K. Kuwabara, H. Jin, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 23 ( 3 ) 1700704 2013.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Simulation and Experimental Demonstration of Logic Circuits Using an Ultra-Low-Power Adiabatic Quantum-Flux-Parametron
K. Inoue, N. Takeushi, K. Ehara, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 23 ( 3 ) 1301105 2013.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Development of Pulse Transfer Circuits forSerially Biased SFQ Circuits Usingthe Nb 9-Layer 1-mm Process
K. Ehara, A. Takahashi, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 23 ( 3 ) 1300504 2013.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Y. Tsuga, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 23 ( 3 ) 1601405 2013.6 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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K. Aoki, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 23 ( 3 ) 2500204 2013.6 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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M. Otsubo, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 23 ( 3 ) 1300904 2013.6 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Pseudo Sigmoid Function Generator for a Superconductive Neural Network
Y. Yamanashi, K. Umeda, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 23 ( 3 ) 1701004 2013.6 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Design and demonstration of an on-chip AC power source for adiabatic quantum-flux-parametron logic
T. Mukaiyama, N. Takeuchi, Y. Yamanashi, N. Yoshikawa
Supercond. Sci. Technol. 26 ( 3 ) 035018 2013.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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An adiabatic quantum flux parametron as an ultra-low-power logic device
N. Takeuchi, D. Ozawa, Y. Yamanashi, N. Yoshikawa
Supercond. Sci. Technol. 26 ( 3 ) 035010 2013.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Measurement of 10 zJ energy dissipation of adiabatic quantum-flux-parametron logic using a superconducting resonator
N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
Appl. Phys. Lett. 102 ( 5 ) 52602 2013.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Implementation of SFQ Microwave Choppers for Controlling Quantum Bits
S. Miura, N. Takeuchi, Y. Yamanashi, and N. Yoshikawa,
Physics Procedia 36 250 - 255 2012 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Investigation of robust CMOS amplifiers for Josephson-CMOS hybrid memories
H. Jin, K. Kuwabara, Y. Yamanashi, and N. Yoshikawa,
Physics Procedia 36 229 - 234 2012 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Demonstration of 30 Gbit/s generation of superconductive true random number generator
T. Sugiura, Y. Yamanashi, N. Yoshikawa
IEEE Trans. Appl. Supercond. 21 ( 3 ) 843 - 846 2011.6 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
Other Link： http://ieeexplore.ieee.org/document/5674104/
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Design Approach of Dynamically Reconfigurable Single Flux Quantum Logic Gate
Y. Yamanashi, I. Okawa, N. Yoshikawa,
IEEE Trans. Appl. Supercond. 21 ( 3 ) 831 - 834 2011.6 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Design and Implementation of Component Circuit of an SFQ Half-Precision Floating-Point Adder Using 10-kA/cm2 Nb Process
T. Kainuma, Y. Shimamura, F. Miyaoka, Y. Yamanashi, N. Yoshikawa, A. Fujimaki, K. Takagi, N. Takagi … Show more authors
T. Kainuma, Y. Shimamura, F. Miyaoka, Y. Yamanashi, N. Yoshikawa, A. Fujimaki, K. Takagi, N. Takagi, and S. Nagasawa Hide authors
IEEE Trans. Appl. Supercond. 21 ( 3 ) 827 - 830 2011.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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100-GHz Single-Flux-Quantum Bit-Serial Adder Based on 10-kA/cm2 Niobium Process
M. Tanaka, H. Akaike, A. Fujimaki, Y. Yamanashi, N. Yoshikawa, S. Nagasawa, K. Takagi, and N. Takagi
IEEE Trans. Appl. Supercond 21 ( 3 ) 792 - 796 2011.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Design and Evaluation of Multi-Flux-Quantum Drivers Using Under-Damped Josephson Junctions
D. Ozawa, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 21 ( 3 ) 835 - 838 2011.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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High-Speed Test of a Radix-2 Butterfly Processing Element for Fast Fourier Transforms Using SFQ Circuits
F. Miyaoka, T. Kainuma, Y. Yamanashi, and N. Yoshikawa
IEEE Trans. Appl. Supercond. 21 ( 3 ) 823 - 826 2011.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Superconductive Combinational Logic Circuit Using Magnetically Coupled SQUID Array
Y. Yamanashi, K. Umeda, and K. Sai
Physica C 470 1546 - 1549 2010.11 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
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N. Takeuchi, D. Ozawa, Y. Yamanashi, and N. Yoshikawa
Physica C 470 ( 20 ) 1550 - 1554 2010.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
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100 GHz Demonstrations Based on the Single-Flux-Quantum Cell Library for the 10 kA/cm2 Nb Multi-Layer Process
Y. Yamanashi, T. Kainuma, N. Yoshikawa, I. Kataeva, H. Akaike, A. Fujimaki, M. Tanaka, N. Takagi, S … Show more authors
Y. Yamanashi, T. Kainuma, N. Yoshikawa, I. Kataeva, H. Akaike, A. Fujimaki, M. Tanaka, N. Takagi, S. Nagasawa, M. Hidaka Hide authors
IEICE Trans. Electron. 93-C ( 4 ) 440 - 444 2010.4 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEICE Joint Work
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Statistical Evaluation of a Superconductive Physical Random Number Generator
T. Sugiura, Y. Yamanashi, and N. Yoshikawa
IEICE Trans. Electron. 93-C ( 4 ) 453 - 457 2010.4 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEICE Joint Work
Other Link： https://www.jstage.jst.go.jp/article/transele/E93.C/4/E93.C_4_453/_article
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N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
IEICE Trans. Electron. 93-C ( 4 ) 458 - 462 2010.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEICE Joint Work
Other Link： https://www.jstage.jst.go.jp/article/transele/E93.C/4/E93.C_4_458/_article
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Access time measurement of 64-kb Josephson-CMOS hybrid memories using SFQ time-to-digital converte
Y. Okamoto, H. Jin, K. Yaguchi, Y. Yamanashi, N. Yoshikawa
IEICE Electron. Express 7 ( 4 ) 320 - 325 2010.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Design of fast digit-serial adders using SFQ logic circuits
H. Park, Y Yamanashi, N. Yoshikawa, M. Tanaka, and A. Fujimaki
IEICE Electron. Express 6 ( 19 ) 1408 - 1413 2009.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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3D simulation of superconducting microwave devices with an electromagnetic-field simulator
N. Takeuchi, Y. Yamanashi, and N. Yoshikawa
Physica C 469 ( 15-20 ) 1662 - 1665 2009.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
Other Link： http://www.sciencedirect.com/science/article/pii/S0921453409003712?via%3Dihub
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Design, Implementation and On-Chip High-Speed Test of SFQ Half-Precision Floating-Point Multiplier
H. Hara, K. Obata, H. Park, Y. Yamanashi, K. Taketomi, N. Yoshikawa, M. Tanaka, A. Fujimaki, N. Tak … Show more authors
H. Hara, K. Obata, H. Park, Y. Yamanashi, K. Taketomi, N. Yoshikawa, M. Tanaka, A. Fujimaki, N. Takagi, K. Takagi, S. Nagasawa Hide authors
IEEE Trans. Appl. Supercond. 19 ( 3 ) 657 - 660 2009.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
Other Link： http://ieeexplore.ieee.org/document/5153003/?reload=true
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SFQ Pulse Transfer Circuits Using Inductive Coupling for Current Recycling
M. Igarashi, Y. Yamanashi, N. Yoshikawa, K. Fujiwara, Y. Hashimoto
IEEE Trans. Appl. Supercond. 19 ( 3 ) 649 - 652 2009.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
Other Link： http://ieeexplore.ieee.org/document/4914773/
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Design and Implementation and On-Chip High-Speed Test of SFQ Half-Precision Floating-Point Adders
H. Park, Y. Yamanashi, K. Taketomi, N. Yoshikawa, M. Tanaka, K. Obata, Y. Ito, A. Fujimaki, N. Taka … Show more authors
H. Park, Y. Yamanashi, K. Taketomi, N. Yoshikawa, M. Tanaka, K. Obata, Y. Ito, A. Fujimaki, N. Takagi, K. Takagi, S. Nagasawa Hide authors
IEEE Trans. Appl. Supercond. 19 ( 3 ) 634 - 639 2009.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Superconductive Random Number Generator Using Thermal Noises in SFQ Circuits
Y. Yamanashi, N. Yoshikawa
IEEE Trans. Appl. Supercond. 19 ( 3 ) 630 - 633 2009.6 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
Other Link： http://ieeexplore.ieee.org/document/5075615/
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Design of single flux quantum cells for a 10-Nb-layer process
H. Akaike, M. Tanaka, K. Takagi, I. Kataeva, R. Kasagi, A. Fujimaki, K. Takagi, M. Igarashi, H. Par … Show more authors
H. Akaike, M. Tanaka, K. Takagi, I. Kataeva, R. Kasagi, A. Fujimaki, K. Takagi, M. Igarashi, H. Park, Y. Yamanashi, N. Yoshikawa, K. Fujiwara, S. Nagasawa, M. Hidaka, N. Takagi Hide authors
Physica C 469 1670 - 1673 2009.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
Other Link： http://www.sciencedirect.com/science/article/pii/S0921453409003736?via%3Dihub
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Development of High-speed and Low-power Microprocessors using Superconductive Circuits
Journal of the Institute of Electrical Engineers of Japan 128 ( 6 ) 369 - 372 2008.6 [Reviewed]
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Institute of Electrical Engineers of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/ieejfms/128/6/128_6_369/_article/-char/ja/
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Bit-Serial Single Flux Quantum Microprocessor CORE
A. Fujimaki, M. Tanaka, T. Yamada, Y. Yamanashi, H. Park, N. Yoshikawa,
IEICE Trans. Electron. E91-C ( 3 ) 342 - 349 2008.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Novel serial-parallel converter using SFQ logic circuits
H. Park,Y.Yamanashi, K. Taketomi, N. Yoshikawa, A. Fujimaki, N. Takagi,
Physica C 468 ( 15-20 ) 1977 - 1982 2008.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
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Tanaka M., Yamanashi Y., Irie N., Park H-J, Iwasaki S., Takagi K., Taketomi K., Fujimaki A., Yoshik … Show more authors
Tanaka M., Yamanashi Y., Irie N., Park H-J, Iwasaki S., Takagi K., Taketomi K., Fujimaki A., Yoshikawa N., Terai H., Yorozu, S. Hide authors
Supercond. Sci. Technol. 20 ( 11 ) S305 - S309 2007.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD Joint Work
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Design of a reconfigurable data-path prototype in the single-flux-quantum circuit
Iwasaki S., Tanaka M., Yamanashi Y., Park H., Akaike H., Fujimaki A., Yoshikawa N., Takagi N., Mura … Show more authors
Iwasaki S., Tanaka M., Yamanashi Y., Park H., Akaike H., Fujimaki A., Yoshikawa N., Takagi N., Murakami K., Honda H., Inoue K. Hide authors
Supercond. Sci. Technol. 20 S328 - S331 2007.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Study of LR-Loading Technique for Low-Power Single Flux Quantum Circuits
Yamanashi Yuki, Nishigai Takanobu, Yoshikawa Nobuyuki
IEEE Trans. Appl. Supercond. 17 ( 2 ) 150 - 153 2007.6 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Diagnostic Test of Large-Scale SFQ Shift Register
Terai Hirotaka, Tanaka Masamitsu, Yamanashi Yuuki, Hashimoto Yoshihito, Fujimaki Akira, Yoshikawa N … Show more authors
Terai Hirotaka, Tanaka Masamitsu, Yamanashi Yuuki, Hashimoto Yoshihito, Fujimaki Akira, Yoshikawa Nobuyuki, Wang Zhen Hide authors
IEEE Trans. Appl. Supercond. 17 ( 2 ) 422 - 425 2007.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Tanaka Masamitsu, Yamanashi Yuki, Kamiya Yoshiaki, Akimoto Aya, Irie Naoki, Park Hee-Joung, Fujimak … Show more authors
Tanaka Masamitsu, Yamanashi Yuki, Kamiya Yoshiaki, Akimoto Aya, Irie Naoki, Park Hee-Joung, Fujimaki Akira, Yoshikawa Nobuyuki, Terai Hirotaka, Yorozu Shinichi Hide authors
IEEE Trans. Appl. Supercond. 17 ( 2 ) 516 - 519 2007.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Design of an SFQ Microwave Chopper for Controlling Quantum Bits
Matsuda Go, Yamanashi Yuki, Yoshikawa Nobuyuki
IEEE Trans. Appl. Supercond. 17 ( 2 ) 146 - 149 2007.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Design and Implementation of a Pipelined Bit-Serial SFQ Microprocessor, CORE1b
Yamanashi Y., Tanaka M., Akimoto A., Park H., Kamiya Y., Irie N., Yoshikawa N., Fujimaki A., Terai … Show more authors
Yamanashi Y., Tanaka M., Akimoto A., Park H., Kamiya Y., Irie N., Yoshikawa N., Fujimaki A., Terai H., Hashimoto Y. Hide authors
IEEE Trans. Appl. Supercond. 17 474 - 477 2007.6 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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On-chip Microwave Generator for Manipulation of Superconductive Quantum Bits
Yamanashi Y., Asano T., Yoshikawa N.
Physica C 445 ( SI ) 967 - 970 2006.7 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
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A New Design Approach for Control Circuits of a Pipelined Single-Flux-Quantum Microprocessor
Yamanashi Y, Akimoto A, Yoshikawa N, Tanaka M, Kawamoto T, Kamiya Y, Fujimaki A, Terai H, Yorozu S
Supercond. Sci. Technol. 19 S340 - S343 2006.3 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Design of a pipelined 8-bit-serial single-flux-quantum microprocessor with multiple ALUs
Tanaka M, Kawamoto T, Yamanashi Y, Kamiya Y, Akimoto A, Fujiwara K, Fujimaki A, Yoshikawa N, Terai … Show more authors
Tanaka M, Kawamoto T, Yamanashi Y, Kamiya Y, Akimoto A, Fujiwara K, Fujimaki A, Yoshikawa N, Terai H, Yorozu S Hide authors
Supercond. Sci. Technol. 19 S344 - S349 2006.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Consideration of Logic Synthesis and Clock Distribution Networks for SFQ Logic Circuits
Akimoto A, Yamanashi Y, Yoshikawa N, Fujimaki A, Yorozu S, Terai H
Physica C 426 ( 2 ) 1687 - 1692 2005.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
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Design of a datapath for single-flux-quantum microprocessors with multiple ALUs
Tanaka M, Kondo T, Kawamoto T, Kamiya Y, Fujiwara K, Yamanashi Y, Akimoto A, Fujimaki A, Yoshikawa … Show more authors
Tanaka M, Kondo T, Kawamoto T, Kamiya Y, Fujiwara K, Yamanashi Y, Akimoto A, Fujimaki A, Yoshikawa N, Terai H, Yorozu S Hide authors
Physica C 426-431 1693 - 1698 2005.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
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Observation of Quantized Energy Levels in a Josephson Junction Using SFQ Circuits
Yamanashi Y, Ito M, Tagami A, Yoshikawa N
IEEE Trans. Appl. Supercond. 15 864 - 867 2005.6 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Demonstration of a Single-Flux-Quantum Microprocessor Using Passive Transmission Line
Tanaka M, Kondo T, Nakajima N, Kawamoto T, Yamanashi Y, Kamiya Y, Akimoto A, Fujimaki A, Hayakawa H … Show more authors
Tanaka M, Kondo T, Nakajima N, Kawamoto T, Yamanashi Y, Kamiya Y, Akimoto A, Fujimaki A, Hayakawa H, Yoshikawa N, Terai H, Hashimoto Y, Yorozu S Hide authors
IEEE Trans. Appl. Supercond. 15 ( 2 ) 400 - 404 2005.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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High-speed Measurement Method of Quantized Energy Levels in Josephson Junctions Using SFQ Circuits
Yamanashi Y, Ito M, Tagami A, Yoshikawa N
Physica C 412-414 ( 2 ) 1546 - 1549 2004.7 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
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A single-flux-quantum logic prototype microprocessor
M. Tanaka, F. Matsuzaki, T. Kondo, N. Nakajima, Y. Yamanashi, A. Fujimaki, H. Hayakawa, N. Yoshikaw … Show more authors
M. Tanaka, F. Matsuzaki, T. Kondo, N. Nakajima, Y. Yamanashi, A. Fujimaki, H. Hayakawa, N. Yoshikawa, H. Terai, and S. Yorozu Hide authors
2004 IEEE International Solid-State Circuits Conference, Digest of Technical Papers 1 298 - 529 2004.2 [Reviewed]
Language：English Publishing type：Research paper (international conference proceedings) Single Work
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Design and implementation of circuit components of the SFQ microprocessor, CORE1
N. Nakajima, F. Matsuzaki, Y. Yamanashi, N. Yoshikawa, M. Tanaka, T. Kondo, A. Fujimaki, H. Terai, … Show more authors
N. Nakajima, F. Matsuzaki, Y. Yamanashi, N. Yoshikawa, M. Tanaka, T. Kondo, A. Fujimaki, H. Terai, and S. Yorozu Hide authors
Supercond. Sci. Technol. 17 ( 3 ) 301 - 307 2004.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IOP Publishing Ltd. Joint Work
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Prototypic design of the single-flux-quantum microprocessor CORE1
M. Tanaka, F. Matsuzaki, T. Kondo, N. Nakajima, Y. Yamanashi, H. Terai, S. Yorozu, N. Yoshikawa, A. … Show more authors
M. Tanaka, F. Matsuzaki, T. Kondo, N. Nakajima, Y. Yamanashi, H. Terai, S. Yorozu, N. Yoshikawa, A. Fujimaki, and H. Hayakawa Hide authors
Supercond. Sci. Technol. 16 ( 12 ) 1460 - 1463 2003.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD Joint Work