Akira FUJIMAKI


Planarized Nb 4-Layer Fabrication Process for Superconducting Integrated Circuits and Its Fabricated Device Evaluation
Shuichi NAGASAWA Masamitsu TANAKA Naoki TAKEUCHI Yuki YAMANASHI Shigeyuki MIYAJIMA Fumihiro CHINA Taiki YAMAE Koki YAMAZAKI Yuta SOMEI Naonori SEGA Yoshinao MIZUGAKI Hiroaki MYOREN Hirotaka TERAI Mutsuo HIDAKA Nobuyuki YOSHIKAWA Akira FUJIMAKI 
Publication:   
Publication Date: 2021/09/01
Vol. E104-C  No. 9  pp. 435-445
Type of Manuscript:  Special Section PAPER (Special Section on Fabrication of Superconductor Devices; Key Technology in Superconductor Electronics)
Category: 
Keyword: 
superconducting fabrication technologyNb/AlOx/Nb Josephson junctioncaldera planarizationmulti-layer structuresingle-flux quantum logicadiabatic quantum flux parametron logiccell-based designdiagnostic shift-registers
 Summary | Full Text:PDF(4MB)

Energy/Space-Efficient Rapid Single-Flux-Quantum Circuits by Using π-Shifted Josephson Junctions
Tomohiro KAMIYA Masamitsu TANAKA Kyosuke SANO Akira FUJIMAKI 
Publication:   
Publication Date: 2018/05/01
Vol. E101-C  No. 5  pp. 385-390
Type of Manuscript:  Special Section PAPER (Special Section on Innovative Superconducting Devices Based on New Physical Phenomena)
Category: 
Keyword: 
energy-efficient circuitπ-shifted Josephson junctionsrapid single-flux-quantumsuperconducting spintronics
 Summary | Full Text:PDF(711.2KB)

Thermally Assisted Superconductor Transistors for Josephson-CMOS Hybrid Memories
Kyosuke SANO Masato SUZUKI Kohei MARUYAMA Soya TANIGUCHI Masamitsu TANAKA Akira FUJIMAKI Masumi INOUE Nobuyuki YOSHIKAWA 
Publication:   
Publication Date: 2018/05/01
Vol. E101-C  No. 5  pp. 370-377
Type of Manuscript:  INVITED PAPER (Special Section on Innovative Superconducting Devices Based on New Physical Phenomena)
Category: 
Keyword: 
nanodevicesthermally assisted devicesingle-flux-quantum logicsuperconducting integrated circuits
 Summary | Full Text:PDF(1.4MB)

Development of an Advanced Circuit Model for Superconducting Strip Line Detector Arrays
Ali BOZBEY Yuma KITA Kyohei KAMIYA Misaki KOZAKA Masamitsu TANAKA Takekazu ISHIDA Akira FUJIMAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2016/06/01
Vol. E99-C  No. 6  pp. 676-682
Type of Manuscript:  INVITED PAPER (Special Section on Cutting-Edge Technologies of Superconducting Electronics)
Category: 
Keyword: 
SSLDkinetic inductance detectorsSFQsuperconductorsneutron detector
 Summary | Full Text:PDF(1.2MB)

FOREWORD
Akira FUJIMAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2016/06/01
Vol. E99-C  No. 6  pp. 667-668
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(61.3KB)

Nb 9-Layer Fabrication Process for Superconducting Large-Scale SFQ Circuits and Its Process Evaluation
Shuichi NAGASAWA Kenji HINODE Tetsuro SATOH Mutsuo HIDAKA Hiroyuki AKAIKE Akira FUJIMAKI Nobuyuki YOSHIKAWA Kazuyoshi TAKAGI Naofumi TAKAGI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/03/01
Vol. E97-C  No. 3  pp. 132-140
Type of Manuscript:  INVITED PAPER (Special Section on Leading-Edge Technology of Superconductor Large-Scale Integrated Circuits)
Category: 
Keyword: 
superconducting fabrication technologyNb/AlOx/Nb Josephson junctionsingle flux quantumplanarizationshift register
 Summary | Full Text:PDF(5.3MB)

Design and High-Speed Demonstration of Single-Flux-Quantum Bit-Serial Floating-Point Multipliers Using a 10kA/cm2 Nb Process
Xizhu PENG Yuki YAMANASHI Nobuyuki YOSHIKAWA Akira FUJIMAKI Naofumi TAKAGI Kazuyoshi TAKAGI Mutsuo HIDAKA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/03/01
Vol. E97-C  No. 3  pp. 188-193
Type of Manuscript:  Special Section PAPER (Special Section on Leading-Edge Technology of Superconductor Large-Scale Integrated Circuits)
Category: 
Keyword: 
floating point unitmultiplierLSRDPSFQ circuitsuperconductive integrated circuit
 Summary | Full Text:PDF(2.2MB)

Large-Scale Integrated Circuit Design Based on a Nb Nine-Layer Structure for Reconfigurable Data-Path Processors
Akira FUJIMAKI Masamitsu TANAKA Ryo KASAGI Katsumi TAKAGI Masakazu OKADA Yuhi HAYAKAWA Kensuke TAKATA Hiroyuki AKAIKE Nobuyuki YOSHIKAWA Shuichi NAGASAWA Kazuyoshi TAKAGI Naofumi TAKAGI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/03/01
Vol. E97-C  No. 3  pp. 157-165
Type of Manuscript:  INVITED PAPER (Special Section on Leading-Edge Technology of Superconductor Large-Scale Integrated Circuits)
Category: 
Keyword: 
advanced processcell-based design techniquehigh-end computinglarge-scale integrationrapid single-flux-quantum circuits
 Summary | Full Text:PDF(2.3MB)

A Reconfigurable Data-Path Accelerator Based on Single Flux Quantum Circuits
Hiroshi KATAOKA Hiroaki HONDA Farhad MEHDIPOUR Nobuyuki YOSHIKAWA Akira FUJIMAKI Hiroyuki AKAIKE Naofumi TAKAGI Kazuaki MURAKAMI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/03/01
Vol. E97-C  No. 3  pp. 141-148
Type of Manuscript:  INVITED PAPER (Special Section on Leading-Edge Technology of Superconductor Large-Scale Integrated Circuits)
Category: 
Keyword: 
single flux quantumreconfigurable data-pathaccelerator
 Summary | Full Text:PDF(2MB)

High-Speed Operation of 0.25-mV RSFQ Arithmetic Logic Unit Based on 10-kA/cm2 Nb Process Technology
Masamitsu TANAKA Atsushi KITAYAMA Masakazu OKADA Tomohito KOUKETSU Takumi TAKINAMI Masato ITO Akira FUJIMAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/03/01
Vol. E97-C  No. 3  pp. 166-172
Type of Manuscript:  Special Section PAPER (Special Section on Leading-Edge Technology of Superconductor Large-Scale Integrated Circuits)
Category: 
Keyword: 
single-flux-quantum logiclow-powerlow-voltagedigital arithmetic
 Summary | Full Text:PDF(1.5MB)

NbN Josephson Junctions for Single-Flux-Quantum Circuits
Hiroyuki AKAIKE Naoto NAITO Yuki NAGAI Akira FUJIMAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/03/01
Vol. E94-C  No. 3  pp. 301-306
Type of Manuscript:  Special Section PAPER (Special Section on Superconducting Signal Processing Technologies)
Category: 
Keyword: 
NbNJosephson junctionsself-shuntedAlNxradical-nitridation
 Summary | Full Text:PDF(1003.4KB)

Proposal of a Compact Neutron Diffraction System with a Single-Flux-Quantum Signal Processor
Akira FUJIMAKI Isao NAKANISHI Shigeyuki MIYAJIMA Kohei ARAI Yukio AKITA Takekazu ISHIDA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/03/01
Vol. E94-C  No. 3  pp. 254-259
Type of Manuscript:  INVITED PAPER (Special Section on Superconducting Signal Processing Technologies)
Category: 
Keyword: 
neutrondiffractionsingle flux quantumtime-to-digital convertertime-of-flight
 Summary | Full Text:PDF(1.7MB)

100 GHz Demonstrations Based on the Single-Flux-Quantum Cell Library for the 10 kA/cm2 Nb Multi-Layer Process
Yuki YAMANASHI Toshiki KAINUMA Nobuyuki YOSHIKAWA Irina KATAEVA Hiroyuki AKAIKE Akira FUJIMAKI Masamitsu TANAKA Naofumi TAKAGI Shuichi NAGASAWA Mutsuo HIDAKA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/04/01
Vol. E93-C  No. 4  pp. 440-444
Type of Manuscript:  Special Section PAPER (Special Section on Frontiers of Superconductive Electronics)
Category: Digital Applications
Keyword: 
single flux quantum circuitJosephson junctioncell libraryadder
 Summary | Full Text:PDF(668.8KB)

Automated Passive-Transmission-Line Routing Tool for Single-Flux-Quantum Circuits Based on A* Algorithm
Masamitsu TANAKA Koji OBATA Yuki ITO Shota TAKESHIMA Motoki SATO Kazuyoshi TAKAGI Naofumi TAKAGI Hiroyuki AKAIKE Akira FUJIMAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/04/01
Vol. E93-C  No. 4  pp. 435-439
Type of Manuscript:  Special Section PAPER (Special Section on Frontiers of Superconductive Electronics)
Category: Digital Applications
Keyword: 
single-flux-quantum circuitcomputer-aided designwire routerpassive transmission line
 Summary | Full Text:PDF(970.9KB)

FOREWORD
Akira FUJIMAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/04/01
Vol. E93-C  No. 4  pp. 427-428
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(47.3KB)

All MgB2 Josephson Junctions with Amorphous Boron Barriers
Naoki MITAMURA Chikaze MARUYAMA Hiroyuki AKAIKE Akira FUJIMAKI Rintaro ISHII Yoshihiro NIIHARA Michio NAITO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/04/01
Vol. E93-C  No. 4  pp. 468-472
Type of Manuscript:  Special Section PAPER (Special Section on Frontiers of Superconductive Electronics)
Category: Junctions
Keyword: 
MgB2Josephson junctionamorphous boron
 Summary | Full Text:PDF(319.6KB)

Bit-Serial Single Flux Quantum Microprocessor CORE
Akira FUJIMAKI Masamitsu TANAKA Takahiro YAMADA Yuki YAMANASHI Heejoung PARK Nobuyuki YOSHIKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2008/03/01
Vol. E91-C  No. 3  pp. 342-349
Type of Manuscript:  INVITED PAPER (Special Section on Recent Progress in Superconductive Digital Electronics)
Category: 
Keyword: 
superconductormicroprocessorsingle flux quantumbit-serialLSI
 Summary | Full Text:PDF(929.4KB)

Proposal of a Desk-Side Supercomputer with Reconfigurable Data-Paths Using Rapid Single-Flux-Quantum Circuits
Naofumi TAKAGI Kazuaki MURAKAMI Akira FUJIMAKI Nobuyuki YOSHIKAWA Koji INOUE Hiroaki HONDA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2008/03/01
Vol. E91-C  No. 3  pp. 350-355
Type of Manuscript:  INVITED PAPER (Special Section on Recent Progress in Superconductive Digital Electronics)
Category: 
Keyword: 
superconductorrapid single-flux-quantum circuitreconfigurable data-pathhigh-performance computingsupercomputer
 Summary | Full Text:PDF(297.2KB)

High-Resolution Analog-to-Digital Converters toward Software-Defined-Radio Receivers
Akira FUJIMAKI Yoshinori NISHIDO Akito SEKIYA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2006/02/01
Vol. E89-C  No. 2  pp. 113-118
Type of Manuscript:  INVITED PAPER (Special Section on Superconducting High-frequency Devices)
Category: 
Keyword: 
analog-to-digital convertersuperconductorsoftware-defined-radiosingle-flux-quantum
 Summary | Full Text:PDF(599.6KB)

Development of Passive Interconnection Technology for SFQ Circuits
Yoshihito HASHIMOTO Shinichi YOROZU Yoshio KAMEDA Akira FUJIMAKI Hirotaka TERAI Nobuyuki YOSHIKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2005/02/01
Vol. E88-C  No. 2  pp. 198-207
Type of Manuscript:  INVITED PAPER (Special Section on Superconducting Electronic Devices and Their Applications)
Category: 
Keyword: 
SFQintegrated circuitinterconnectionsuperconductorpassive transmission line
 Summary | Full Text:PDF(1.9MB)

High-End Server Based on Complexity-Reduced Architecture for Superconductor Technology
Akira FUJIMAKI Yoshiaki TAKAI Nobuyuki YOSHIKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2002/03/01
Vol. E85-C  No. 3  pp. 612-616
Type of Manuscript:  INVITED PAPER (Special Issue on Superconductive Electronics)
Category: Digital Devices and Their Applications
Keyword: 
SFQmemoryprocessorsuperconducting circuitJAVA
 Summary | Full Text:PDF(350.1KB)

Design and Demonstration of Pipelined Circuits Using SFQ Logic
Akira AKAHORI Akito SEKIYA Takahiro YAMADA Akira FUJIMAKI Hisao HAYAKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2002/03/01
Vol. E85-C  No. 3  pp. 641-644
Type of Manuscript:  Special Section PAPER (Special Issue on Superconductive Electronics)
Category: Digital Devices and Their Applications
Keyword: 
SFQpipeline architectureparameter spreadleakage currentparameter optimization method
 Summary | Full Text:PDF(490.6KB)

Bit Error Rate Measurement of a Measuring System Designed for Superconducting Digital Circuits
Kazuhiro SHIMAOKA Seiichi TOKUNAGA Masaaki NEMOTO Isao YOSHIDA Akira FUJIMAKI Hisao HAYAKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2001/01/01
Vol. E84-C  No. 1  pp. 29-34
Type of Manuscript:  Special Section PAPER (Special Issue on Superconductive Electronics)
Category: Digital Applications
Keyword: 
bit error rate (BER)cryo-coolervector network measurementsuperconductormagnetic shield
 Summary | Full Text:PDF(748KB)

Ramp-Edge Josephson Junctions Using Barriers of Various Resistivities
Masahiro HORIBE Koh-ichi KAWAI Akira FUJIMAKI Hisao HAYAKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1998/10/25
Vol. E81-C  No. 10  pp. 1526-1531
Type of Manuscript:  INVITED PAPER (Special Issue on Low- and High-Temperature Superconductive Electron Devices and Their Applications)
Category: High-Tc Junction Technology
Keyword: 
ramp-edge Josephson junctionGa dopingCa dopingdirect tunnelingresonant tunneling
 Summary | Full Text:PDF(604.9KB)

Vortex Flow Transistors Based on YBa2Cu3O7δ Films
Akira FUJIMAKI Masanobu KUSUNOKI Masaru KITO Syuji YOSHIDA Hiroya ANDOH Hisao HAYAKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1996/09/25
Vol. E79-C  No. 9  pp. 1247-1253
Type of Manuscript:  INVITED PAPER (Special Issue on Toward Digital and Analog Applications of Superconductors)
Category: Device technology
Keyword: 
vortex flow transistorAbrikosov vortexnanobridgehigh-temperature superconductor
 Summary | Full Text:PDF(917.3KB)