Publication

The recent papers and presentations related with the research in Fujimaki Lab.

• ASC 2008 Preprints

To Be Presented

The 2008 IEICE Society Conference; the Institute of Electronics, Information and Communication Engineers (Meiji Univ., September 16-19, 2008)

C-8-7 Development of an event-driven selector for arrayed superconducting detectors

Y. Higashi, S. Miyajima, A. Bozbey, A. Fujimaki

C-8-9 Implementation and Evaluation of a Wire Routing Tool Using Passive Transmission Lines for the Single-Flux-Quantum Circuits Based on the A* Algorithm

M. Tanaka, K. Obata, Y. Ito, S. Takeshima, M. Satoh, K. Takagi, N. Takagi, H. Akaike, A. Fujimaki

C-8-10 Investigation of scalability of a reconfigurable data-path in the single-flux-quantum circuit

R. Kasagi, M. Tanaka, K. Takagi, I. Kataeva, K. Ito, H. Akaike, A. Fujimaki, N. Takagi, N. Yoshikawa, K. Murakami

C-8-11 Study on reduction of the circuit area of SFQ half-precision floating point unit

H. Park, Y. Yamanashi, H. Hara, K. Taketomi, T. Kainuma, M. Tanaka, Y. Ito, N. Yoshikawa, A. Fujimaki, N. Takagi

C-8-12 Design and Demonstration of SFQ Half-Precision Floating Point Multiplier

H. Hara, K. Obata, H. Park, Y. Yamanashi, K. Taketomi, N. Yoshikawa, M. Tanaka, A. Fujimaki, N. Takagi, K. Takagi

C-8-13 Measurements of Shift Registers Fabricated by Nb Multi-layer Fabrication Process

S. Nagasawa, T. Satoh, K. Hinode, Y. Kitagawa, M. Hidaka, A. Fujimaki, H. Akaike, K. Takagi, N. Takagi, N. Yoshikawa¡Ê

The 21st International Symposium on Superconductivity (ISS 2008) (Tsukuba, October 27-29, 2007)

An Operand Routing Network for an SFQ-RDP processor: new design and experimental results

I. Kataeva, H. Akaike, A. Fujimaki, N. Yoshikawa, N. Takagi, K. Murakami

Single-Flux-Quantum-Based Readout System for an Array of Transition Edge Sensors

S. Miyajima, A. Bozbey, Y. Higashi, H. Akaike, A. Fujimaki

Control of return currents in the single-flux-quantum circuits using positive/negative bias supply lines

M. Tanaka, H. Akaike, A. Fujimaki

Recent Papers

Bit-Serial Single Flux Quantum Microprocessor CORE

A. Fujimaki, M. Tanaka, T. Yamada, Y. Yamanashi, H. Park, N. Yoshikawa,
IEICE TRANSACTIONS on Electronics, vol. E91-C, no.3, pp. 342-349, March 2008.

Proposal of a Desk-Side Supercomputer with Reconfigurable Data-Paths Using Rapid Single-Flux-Quantum Circuits

N. Takagi, K. Murakami, A. Fujimaki, N. Yoshikawa, K. Inoue, H. Honda,
IEICE TRANSACTIONS on Electronics, vol. E91-C, no.3, pp. 350-355, March 2008.

Recent Presentations

The 69th Autumn Meeting; the Japan Society of Applied Physics (Chubu University, September 2-5, 2008)

4a-F-2 Superconductive contact technique for vertically-stacked Josephson junctions used in single-flux-quantum circuits

T. Kimura, M. Watanabe, K. Kajino, Y. Horii, M. Inoue, A. Fujimaki

4a-F-3 Evaluation of Characteristics of High-Tc Nanobridges Prepared with Damage-Recovery Process

K. Kajino, T. Kimura, Y. Horii, M. Watanabe, M. Inoue, A. Fujimaki

4p-F-4 Investigation of pretreatment of MgO substrates toward NbN overdamped junctions

Y. Nagai, R. Kanada, H. Akaike, A. Fujimaki

4p-F-6 Broad Band On-Chip Packaging of HEMT Device Blocks into a Superconductor Circuit

T. Okumura, Nirmal Mehta, H. Akaike, A. Fujimaki, K. Maezawa

4p-F-7 SFQ Propagation Properties in Passive Transmission Lines Including Via-holes on a 10-Nb-Layers Structure

K. Takagi, M. Tanaka, R. Kasagi, H. Akaike, A. Fujimaki

4p-F-8 Study on SFQ Readout Circuit and Packaging for a TES Array

A. Bozbey, S. Miyajima, H. Akaike, A. Fujimaki

4p-F-13 A likelihood discriminator for a flux-qubit readout based on SFQ circuit

S. Nakamura, A. Fujimaki

2008 Applied Superconductivity Conference (Chicago, August 17-22, 2008)

2EPA03 The Effects of DC Power Layers in a 10-Nb-Layer Device for SFQ LSIs

H. Akaike, K. Shigehara, A. Fujimaki, T. Satoh, K. Hinode, S. Nagasawa, M. Hidaka

2EPB04 Multi-layer Nb Integrated Circuit Structure Incorporating the Top Active Layer

T. Satoh, K. Hinode, S. Nagasawa, Y. Kitagawa, M. Hidaka, N. Yoshikawa, H. Akaike, A. Fujimaki, K. Takagi, N. Takagi

2EPC02 Preparation of narrowed nanobridges down to 30 nm with reduced degradation

K. Kajino, T. Kimura, Y. Horii, M. Watanabe, M. Inoue, A. Fujimaki

2EPH01 Self-shunted NbN junctions with NbNx/AlN/NbNx multilayered barriers for 4 K operation

R. Kanada, Y. Nagai, H. Akaike, A. Fujimaki

2EX05 Single-flux-quantum circuit based readout system for detector arrays by using time to digital conversion

A Bozbey, S, Miyajima, H Akaike, A Fujimaki

2EZ01 Demonstration of an SFQ-Based Accelerator Prototype for a High-Performance Computer

A. Fujimaki, S. Iwasaki, K. Takagi, R. Kasagi, I. Kataeva, H. Akaike, M. Tanaka, N. Takagi, N. Yoshikawa, K. Murakami

2EZ02 A high-throughput single-flux-quantum floating-point serial divider using the signed-digit representation

M. Tanaka, K., Obata, K. Takagi, N. Takagi, A. Fujimaki, N. Yoshikawa

2EZ03 Design and Implementation of SFQ Half-Precision Floating-Point Multipliers

H. Hara, H. Park, Y. Yamanashi, K. Taketomi, N. Yoshikawa, K. Obata, M. Tanaka, N. Takagi, K. Takagi, A. Fujimaki, S. Nagasawa

2EZ06 Design and High-Speed Test of a Radix-2 Butterfly Unit for the Fast Fourier Transform Using SFQ Circuits

K. Taketomi, Y. Yamanashi, H. Park, N. Yoshikawa, A. Fujimaki, Y. Hashimoto, H. Terai

2EZ07 An Operand Routing Network for an SFQ Reconfigurable Data-Paths Processor

I. Kataeva, H., Akaike, A. Fujimaki, N. Takagi, N. Yoshikawa, K. Inoue, H. Honda, K. Murakami

3EPC01 Study on the Single-flux-quantum Signal Generation by Millimeter Wave for Driving SFQ Circuits at Sub- terahertz Frequencies

M. Inoue, Y. Horii, T. Kimura, K. Kajino, A. Fujimaki, H. Andoh

3EPC02 SFQ Propagation Properties in Passive Transmission Lines Based on a 10-Nb-Layers Structure

K. Takagi, M. Tanaka, I. Kataeva, S. Iwasaki, R. Kasagi, H. Akaike, A. Fujimaki, S. Nagasawa, T. Sato

3EPH02 SFQ Single-Shot Readout Circuit for a Flux Qubit Based on Current-to-Time Conversion

S. Nakamura, H. Numabe, A. Fujimaki

4EB01 Design and Implementation of SFQ Half-Precision Floating-Point Adders

H. Park, Y. Yamanashi, K. Taketomi, N. Yoshikawa, M. Tanaka, K. Obata, Y. Itou, A. Fujimaki, N. Takagi, K. Takagi, S. Nagasawa

4EX01 Operation of toggle flip-flop circuits up to 500 GHz based on vertically-stacked high-temperature superconductor Josephson junctions

T. Kimura, M. Watanabe, K. Kajino, Y. Horii, M. Inoue, A. Fujimaki

The 55th Spring Meeting 2008; the Japan Society of Applied Physics (Nihon University, March 27-30, 2008)

28a-NA-2 Characterization of barrier AlN films toward NbN/AlN/NbNx/NbN overdamped junctions

R. Kanada, Y. Nagai, H. Akaike, A. Fujimaki

28a-NA-6 Evaluation of Millimeter Wave Response of Interface-Engineered Josephson Junctions for Generating SFQ at Sub-THz Order

Y. Horii, T. Kimura, K. Kajino, H. Ando, M. Inoue, A. Fujimaki

28a-NA-7 500 GHz Operation of Toggled Flip-Flop based on Vertically-Stacked High Temperature Superconductor Josephson Junctions

T. Kimura, M. Watanabe, K. Kajino, Y. Horii, M. Inoue, A. Fujimaki

28a-NA-8 Effect of the re-deposition process on characteristics of HTS nanobridges

K. Kajino, T. Kimura, Y. Horii, M. Kusunoki, I. Kawayama, M. Inoue, M. Tonouchi, A. Fujimaki

28a-NA-9 Influence of the Bridge Shape on the Properties of YBCO Nanobridges for Interfaces between SFQ and Optical Signals

M. Inoue, K. Kajino, T. Kimura, A. Fujimaki

28p-NA-2 Evaluation of a DC-power layer in a new multilayered device

H. Akaike, K. Shigehara, A. Fujimaki, S. Nagasawa

28p-NA-4 Evaluation of property of transmission and reception for passive transmission lines with the multilayered process

K. Takagi, M. Tanaka, S. Iwasaki, R. Kasagi, H. Akaike, A. Fujimaki

28p-NA-14 Prototype design and evaluation of a readout single-flux-quantum circuit for flux qubits

S. Nakamura, H. Numabe, A. Fujimaki

28p-NA-16 Development of Time-to-Digital Converter for combination with Transition Edge Sensor

S. Miyajima, Ali Bozbey, A. Fujimaki

28p-NA-17 16-GHz operation of a high-throughput single-flux-quantum ALU based on state transitions

M. Tanaka, K. Obata, K. Takagi, N. Takagi, A. Fujimaki, N. Yoshikawa, Y. Takai

The 2008 IEICE General Conference; the Institute of Electronics, Information and Communication Engineers (Kitakyushu Science and Research Park, March 18-21, 2008)

C-8-7 New Nb Multi-layer Fabrication Process for Superconducting SFQ Circuits

S. Nagasawa, T. Satoh, K. Hinode, Y. Kitagawa, M. Hidaka, A. Fujimaki, H. Akaike, K. Takagi, N. Takagi, N. Yoshikawa

C-8-17 Design and implementation of the SFQ half-precision floating point adder

H. Park, Y. Yamanashi, K. Taketomi, M. Tanaka, Y. Ito, K. Obata, N. Yoshikawa, A. Fujimaki, N. Takagi

C-8-18 Design and Implementation of SFQ Half-precision Floating Point Multiplier

H. Hara, K. Obata, H. Park, Y. Yamanashi, K. Taketomi, N. Yoshikawa, M. Tanaka, K. Takagi, A. Fujimaki, N. Takagi

C-8-21 Demonstration of a 2×2 reconfigurable data-path in the signle-flux-quantum circuit

S. Iwasaki, R. Kasagi, M. Tanaka, K. Takagi, H. Akaike, A. Fujimaki, N. Takagi, N. Yoshikawa, K. Murakami

Superconducting SFQ VLSI Workshop (Yokohama, March 17, 2008)

A1-1 New Nb Multi-Layer Fabrication Process for Superconducting SFQ Circuits

S. Nagasawa, T. Satoh, K. Hinode, Y. Kitagawa, M. Hidaka, H. Akaike, A. Fujimaki, K. Takagi, N. Takagi, N. Yoshikawa

A1-2 Self-shunted NbN Josephson Junctions with AlN/NbNx Barriers

A. Fujimaki, R. kanada, Y. Nagai, H. Akaike

I-2 Demonstration of the key components of an SFQ Reconfigurable Data-Paths Processor: an Operand Routing Network and a 2×2 RDP prototype

I. Kataeva, S. Iwasaki, H. Akaike, A. Fujimaki, N. Yoshikawa, N. Takagi, K. Murakami

I-3 CORE1: Review and Recent Developments in Bit-serial SFQ Microprocessors

M. Tanaka, K. Obata, Y. Yamanashi, H. Park, S. Iwasaki, K. Taketomi, K. Takagi, K. Takagi, N. Takagi, A. Fujimaki, N. Yoshikawa

A2-5 Design and Implementation of the SFQ Floating Point Units

H. Park, Y. Yamanashi, H. Hara, K. Taketomi, N. Yoshikawa, M. Tanaka, K. Obata, Y. Itou, A. Fujimaki, K. Takagi, N. Takagi

P1-2 Critical currents of single externally shunted Nb/AlOx/Nb junc-tions with and without connections to a ground plane

H. Akaike, R. Kasagi, A. Fujimaki

P1-3 Fabrication and measurement of high quality and high critical current density Nb/AlOx/Nb Josephson junction

N. Mitamura, H. Akaike, A. Fujimaki

P1-5 Fabrication and Estimation of Nb SFQ VLSI Circuit Structure Incorporating the Top Active Layer

T. Satoh, K. Hinode, S. Nagasawa, Y. Kitagawa, M. Hidaka, N. Yoshikawa, H. Akaike, A. Fujimaki, K. Takagi, N. Takagi

P2-1 Numerical Analysis of SFQ Propagation Properties in Via-Holes for Passive Transmission Lines Based on a 10-Nb-Layers Structure

K. Takagi, M. Tanaka, I. Kataeva, S. Iwasaki, R. Kasagi, S. Nagasawa, T. Sato, H. Akaike, A. Fujimaki

P2-3 Read-out of the response of TES detector arrays by using single flux quantum based circuits

A. Bozbey, S. Miyajima, H. Akaike, A. Fujimaki

P2-9 Design and Implementation of the SFQ Half-Precision Floating Point Adder

H. Park, Y. Yamanashi, K. Taketomi, N. Yoshikawa, M. Tanaka, K. Obata, Y. Itou, A. Fujimaki, K. Takagi, N. Takagi

P2-10 Design and Implement of SFQ Half-Precision the Floating-Point Multiplier

H. Hara, K. Obata, H. Park, Y. Yamanashi, N. Yoshikawa, M. Tanaka, Y. Ito, A. Fujimaki, N. Takagi, K. Takagi