Extremely Energy-Efficient Processors

Research Output 1984 2017

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2017

Research trends and new developments in phase engineering

Yoshikawa, N. 2017 In : IEEJ Transactions on Fundamentals and Materials. 137, 1, p. 23-25 3 p.

Research output: Contribution to journalArticle

Superconducting materials
Electrons
2016
Fluxes
Inductance
Logic circuits
Excited states
Superconducting materials
Fluxes
Flip flop circuits
Fluxes
Computer hardware description languages
Adders
Finite automata
Fabrication

High-speed demonstration of low-power 1 k-bit shift-register memories using LR-biasing SFQ circuits

Takahashi, T., Numaguchi, R., Yamanashi, Y. & Yoshikawa, N. 2016 Mar 16 In : IEICE Electronics Express. 13, 6

Research output: Contribution to journalArticle

Shift registers
Electric power utilization
Bias currents
Inductance
Microprocessor chips
Bias currents
Electric lines
Fluxes
Shift registers
Recovery
SQUIDs
Energy dissipation
Thermal noise
Circuit simulation
Analog circuits
Fluxes
Logic circuits
Timing jitter
Thermal noise
Shift registers

Toward the creation of future technologies based on superconductivity

Yoshikawa, N. 2016 Jan 1 In : IEEJ Transactions on Fundamentals and Materials. 136, 1, p. 18-20 3 p.

Research output: Contribution to journalArticle

Superconducting devices
Superconductivity
Superconducting materials
2015
2 Citations
Fast Fourier transforms
Fluxes
Demonstrations
7 Citations
Fluxes
Electric wiring
Logic design
Magnetic couplings
Logic circuits
1 Citations

Demonstration of bit-serial SFQ-based computing for integer iteration algorithms

Xu, Q., Peng, X., Ortlepp, T., Yamanashi, Y. & Yoshikawa, N. 2015 Jun 1 In : IEEE Transactions on Applied Superconductivity. 25, 3, 6967746

Research output: Contribution to journalArticle

Clocks
Electric power utilization
Fluxes
Energy efficiency
Demonstrations
Fluxes
Detectors
Ions
Mass spectrometry
Discriminators
1 Citations
Superconducting materials
Fluxes
Digital circuits
Demonstrations
Magnetic couplings
Fluxes
Logic gates
Adders
Logic circuits
Boolean functions

Fast and accurate inductance and coupling calculation for a multi-layer Nb process

Fourie, C. J., Takahashi, A. & Yoshikawa, N. 2015 Mar 1 In : Superconductor Science and Technology. 28, 3, 035013

Research output: Contribution to journalArticle

Inductance
Electric wiring
Quantum electronics
Shielding
Gages
1 Citations

High-speed demonstration of bit-serial floating-point adders and multipliers using single-flux-quantum circuits

Peng, X., Xu, Q., Kato, T., Yamanashi, Y., Yoshikawa, N., Fujimaki, A., Takagi, N., Takagi, K. & Hidaka, M. 2015 Jun 1 In : IEEE Transactions on Applied Superconductivity. 25, 3, 6990569

Research output: Contribution to journalArticle

Fluxes
Adders
Clocks
Network routing
Energy efficiency
1 Citations
Fast Fourier transforms
Clocks
Energy dissipation
Fluxes
Merging
Fluxes
Circuit simulation
SQUIDs
Electric lines
1 Citations

Inductance and coupling of stacked vias in a multilayer superconductive IC process

Fourie, C. J., Peng, X., Numaguchi, R. & Yoshikawa, N. 2015 Jun 1 In : IEEE Transactions on Applied Superconductivity. 25, 3, 6975060

Research output: Contribution to journalArticle

Inductance
SQUIDs
Integrated circuits
Multilayers
Modulation

Magnetically coupled quantum-flux-latch with wide operation margins

Tsuji, N., Takeuchi, N., Narama, T., Ortlepp, T., Yamanashi, Y. & Yoshikawa, N. 2015 Sep 29 In : Superconductor Science and Technology. 28, 11, 115013

Research output: Contribution to journalArticle

Fluxes
Superconducting materials
1 Citations
Superconducting materials
Energy dissipation
Temperature
Thermal noise
Logic gates
2014
5 Citations
Fluxes
Flip flop circuits
Demonstrations
7 Citations

Novel latch for adiabatic quantum-flux-parametron logic

Takeuchi, N., Ortlepp, T., Yamanashi, Y. & Yoshikawa, N. 2014 Mar 14 In : Journal of Applied Physics. 115, 10, 103910

Research output: Contribution to journalArticle

Fluxes
Shift registers
Logic gates
Flip flop circuits
Clocks
10 Citations
Logic gates
Energy dissipation
Superconducting devices
Logic devices
Entropy
1 Citations
Fluxes
Critical currents
Circuit simulation
Inductance
Integrated circuits
2013
38 Citations

An adiabatic quantum flux parametron as an ultra-low-power logic device

Takeuchi, N., Ozawa, D., Yamanashi, Y. & Yoshikawa, N. 2013 Mar 1 In : Superconductor Science and Technology. 26, 3, 035010

Research output: Contribution to journalArticle

Fluxes
Energy dissipation
Logic devices
Thermal energy
Inductance
1 Citations
Fluxes
Bias currents
Superconducting resonators
Relaxation oscillators
Potential energy
21 Citations
Fluxes
Temperature
Thermal noise
Critical currents
Circuit simulation
26 Citations
Fluxes
Superconducting resonators
Energy dissipation
Insertion losses
Resonators
1 Citations

Operation of an adiabatic quantum-flux-parametron gate using an on-chip AC power source

Mukaiyama, T., Takeuchi, N., Ehara, K., Inoue, K., Yamanashi, Y. & Yoshikawa, N. 2013 Apr 22 In : IEEE Transactions on Applied Superconductivity. 23, 4, 6495566

Research output: Contribution to journalArticle

Fluxes
Superconducting resonators
Relaxation oscillators
Logic devices
Bias currents
10 Citations
Fluxes
Adders
Bias currents
Logic gates
Logic circuits
11 Citations
Fluxes
Bit error rate
Thermal energy
Energy efficiency
Entropy
2010
1 Citations
Microwaves
Fluxes
Refrigerators
Dilution
Electronic equipment
1 Citations
Microwaves
Fluxes
Pulse generators
Irradiation
2009
5 Citations
Microwave devices
Electromagnetic fields
Simulators
Superconducting devices
Microwave filters
2007
6 Citations

A new design approach for high-throughput arithmetic circuits for single-flux-quantum microprocessors

Tanaka, M., Yamanashi, Y., Kamiya, Y., Akimoto, A., Irie, N., Park, H. J., Fujimaki, A., Yoshikawa, N., Terai, H. & Yorozu, S. 2007 Jun 1 In : IEEE Transactions on Applied Superconductivity. 17, 2, p. 516-519 4 p.

Research output: Contribution to journalArticle

Throughput
Fluxes
Microprocessor chips
Sequential circuits
Logic circuits
33 Citations

Design and implementation of a pipelined bit-serial SFQ microprocessor, CORE1β

Yamanashi, Y., Tanaka, M., Akimoto, A., Park, H., Kamiya, Y., Irie, N., Yoshikawa, N., Fujimaki, A., Terai, H. & Hashimoto, Y. 2007 Jun 1 In : IEEE Transactions on Applied Superconductivity. 17, 2, p. 474-477 4 p.

Research output: Contribution to journalArticle

Microprocessor chips
Fluxes
Electric power utilization
4 Citations

Design of an SFQ microwave chopper for controlling quantum bits

Matsuda, G., Yamanashi, Y. & Yoshikawa, N. 2007 Jun 1 In : IEEE Transactions on Applied Superconductivity. 17, 2, p. 146-149 4 p.

Research output: Contribution to journalArticle

Fluxes
Microwaves
Switches
Bandpass filters
Thermal noise
2 Citations

Diagnostic test of large-scale SFQ shift register

Terai, H., Tanaka, M., Yamanashi, Y., Hashimoto, Y., Fujimaki, A., Yoshikawa, N. & Wang, Z. 2007 Jun 1 In : IEEE Transactions on Applied Superconductivity. 17, 2, p. 422-425 4 p.

Research output: Contribution to journalArticle

Shift registers
Dewars
Flux pinning
Defects
Metals
25 Citations

Study of LR-loading technique for low-power single flux quantum circuits

Yamanashi, Y., Nishigai, T. & Yoshikawa, N. 2007 Jun 1 In : IEEE Transactions on Applied Superconductivity. 17, 2, p. 150-153 4 p.

Research output: Contribution to journalArticle

Fluxes
Electric power utilization
Temperature
Clocks
Substrates
2006
5 Citations

A new design approach for control circuits of pipelined single-flux-quantum microprocessors

Yamanashi, Y., Akimoto, A., Yoshikawa, N., Tanaka, M., Kawamoto, T., Kamiya, Y., Fujimaki, A., Terai, H. & Yorozu, S. 2006 May 1 In : Superconductor Science and Technology. 19, 5

Research output: Contribution to journalArticle

Microprocessor chips
Fluxes
Controllers
Flip flop circuits
Logic circuits
18 Citations

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, H. & Yorozu, S. 2006 May 1 In : Superconductor Science and Technology. 19, 5

Research output: Contribution to journalArticle

Microprocessor chips
Clocks
Fluxes
Niobium
Electric power utilization
4 Citations

On-chip microwave generator for manipulation of superconductive quantum bits

Yamanashi, Y., Asano, T. & Yoshikawa, N. 2006 Oct 1 In : Physica C: Superconductivity and its Applications. 445-448, 1-2, p. 967-970 4 p.

Research output: Contribution to journalArticle

Microwaves
Fluxes
Clocks
Quantum computers
Semiconductor quantum wires
2005

Consideration of logic synthesis and clock distribution networks for SFQ logic circuits

Akimoto, A., Yamanashi, Y., Yoshikawa, N., Fujimaki, A., Yorozu, S. & Terai, H. 2005 Oct 7 In : Physica C: Superconductivity and its Applications. 426-431, II, p. 1687-1692 6 p.

Research output: Contribution to journalArticle

Fluxes
Logic Synthesis
Clocks
Logic circuits
Logic gates
44 Citations

Demonstration of a single-flux-quantum microprocessor using passive transmission lines

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. 2005 Jun 1 In : IEEE Transactions on Applied Superconductivity. 15, 2 PART I, p. 400-404 5 p.

Research output: Contribution to journalArticle

Electric lines
Microprocessor chips
Fluxes
Clocks
Electric power utilization
5 Citations

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, N., Terai, H. & Yorozu, S. 2005 Oct 7 In : Physica C: Superconductivity and its Applications. 426-431, II, p. 1693-1698 6 p.

Research output: Contribution to journalArticle

Microprocessor chips
Fluxes
Testing
3 Citations

Observation of quantized energy levels in a Josephson junction using SFQ circuits

Yamanashi, Y., Ito, M., Tagami, A. & Yoshikawa, N. 2005 Jun 1 In : IEEE Transactions on Applied Superconductivity. 15, 2 PART I, p. 864-867 4 p.

Research output: Contribution to journalArticle

Electron energy levels
Fluxes
Temperature
Bias currents
2004
10 Citations

Design and implementation of circuit components of the SFQ microprocessor CORE1

Nakajima, N., Matsuzaki, F., Yamanashi, Y., Yoshikawa, N., Tanaka, M., Kondo, T., Fujimaki, A., Terai, H. & Yorozu, S. 2004 Mar 1 In : Superconductor Science and Technology. 17, 3, p. 301-307 7 p.

Research output: Contribution to journalArticle

Microprocessor chips
Computer aided design
Controllers
4 Citations

High-speed measurement method of quantized energy levels in Josephson junctions using SFQ circuits

Yamanashi, Y., Ito, M., Tagami, A. & Yoshikawa, N. 2004 Oct 1 In : Physica C: Superconductivity and its Applications. 412-414, SPEC. ISS., p. 1546-1549 4 p.

Research output: Contribution to journalArticle

Electron energy levels
Fluxes
Bias currents
Experiments
Temperature