Laboratory
C2Lab
Affiliation
Kyushu University
Location
Fukuoka, Japan
C squared Lab, Cryogenic Computing Laboratory
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Cryogenic Computing Laboratory · Kyushu University

From devices to
full-stack cryogenic systems

We design, build, and evaluate energy-efficient computing systems that operate at cryogenic temperatures, spanning superconducting devices, architectures, EDA tools, and system integration.

10 mK – 4 K Performance · Energy efficiency · Scalability

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01

Superconducting Devices

AQFP, SFQ, and related superconducting devices, from digital circuits to neuron circuits.

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Illustration representing superconducting device research
Fig. 01Device illustration

02

Cryogenic Computing Systems

Machine-learning accelerators, neural-network hardware, and quantum-control circuits.

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Cryogenic computing chip mounted in a precision test package
Fig. 02Cryogenic test

03

EDA & Design Automation

Full-stack superconducting IC design and test, with EDA development and LLM-assisted workflows.

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Magnified detail of the 8-bit KSA circuit layout presented at ICSM 2026
Fig. 03Layout

Lab initiatives

QUESTConference series Computer Systems FoundationsEducation

Latest publications

All publications
  1. 2025 Design and Implementation of Energy-Efficient Majority-Logic-Based Approximate Adders Using Adiabatic Quantum-Flux-Parametron Technology →
  2. 2025 Electrostatic Gate-Tunable Josephson Junctions in JoSIM: Modeling, Simulation, and I--V Characterization →
  3. 2025 Graph Convolutional Network Acceleration Using Adiabatic Superconductor Josephson Devices →