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Takeuchi Lab
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The lab explores ultra-low-power electronics approaching physical limits using superconducting circuits.
AboutAbout the lab
Ultra-low-power electronics approaching physical limits
The Takeuchi Lab (Physical Information Circuits Division) studies ultra-low-power electronics that approach physical limits.
The background to this research is the rapid growth in ICT power consumption driven by the spread of AI and IoT.
At the core is the adiabatic quantum-flux-parametron (AQFP), a superconducting logic element with extremely low energy consumption.
Based on AQFP, the lab develops superconducting quantum computers, adiabatic reversible computers, and more.
Key terms
- Adiabatic Quantum-Flux-Parametron (AQFP)
- A low-power logic element that represents logic states with superconducting current and switches them with adiabatic switching.
- Adiabatic reversible computer
- A computer built from circuits that are both logically and physically reversible, aiming for computation with infinitesimal energy consumption.
- Single-Flux-Quantum (SFQ) circuit
- A superconducting circuit that uses fast voltage pulses and achieves a high operating speed.
NewsLab news
View More ↗ResearchResearch themes
The lab believes that realizing a super-smart society requires new electronics technology with better energy efficiency than conventional integrated circuit technology. It has demonstrated low-power digital circuits using AQFP as the basic element, and is now developing superconducting quantum computers and more.
*Illustrative imageAQFP, an Ultra-Low-Energy Logic Element
AQFP is a logic element that represents logic states with superconducting current and switches by smoothly changing the shape of the potential energy. Propagating, holding, and switching information can all be performed with small dissipation.
*Illustrative imageSuperconducting Quantum Computers
To integrate many qubits and control circuits at cryogenic temperatures, the lab is developing ultra-low-power qubit control circuits using AQFP. In joint research with the University of Tokyo and others, it carried out integration experiments with qubits and succeeded in control experiments.
*Illustrative imageAdiabatic Reversible Computers
The lab proposed RQFP, a reversible logic gate based on AQFP. It is a circuit that is both logically and physically reversible, and numerical calculations showed the possibility of performing logic operations with infinitesimal energy consumption.
*Illustrative imageFast, Low-Power Artificial Neural Networks
The lab studies artificial neural networks in which single-flux-quantum (SFQ) circuits emulate synapses and AQFP circuits are combined as ultra-low-power neurons. In joint research with Kyushu University and others, it developed element circuits such as a random number generator.
MembersFaculty
The Takeuchi Lab consists of faculty members and students.As of 2026
- ProfessorNaoki Takeuchi
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Hero-64-pixel-array-superconducting-nanowire-single-photon-detector-b” NASA/JPL-Caltech; Text by Dr. Warren Holmes / Public domain (cropped)
- AQFP, an Ultra-Low-Energy Logic Element: “XLD Pulse-Tube-Type Large Frame Dilution Refrigerator Cryostat” OJB Quantum / CC BY 4.0 (cropped)
- Superconducting Quantum Computers: “Quantum Computer with Dispersive Background 2” OJB Quantum / CC BY 4.0 (cropped)
- Adiabatic Reversible Computers: “Ferranti ULA1U034JBS Gate Array” Revaldinho / CC BY 4.0 (cropped)
- Fast, Low-Power Artificial Neural Networks: “SB400 Closeup ( )” Cole L / CC BY-SA 2.0 (cropped)
- Related lab (Next-Generation Spin Electronics Materials Engineering [Tsunoda] Lab): “Actuator arm assembly of a hard disk drive” Mk2010 / CC BY 4.0 (cropped)
- Related lab (Innovative Spintronics Device Lab): “Unisys SCAMP die” Pauli Rautakorpi / CC BY 3.0 (cropped)
- Related lab (Electronic Equipment Engineering Lab): “A semiconductor wafer on a dicing (blue) tape. Few chips (dies) from the wafer have already been picked up (removed) for further manufacturing” Khpsoi / CC BY-SA 4.0 (cropped)
- Related lab (Green Power Electronics [Endoh (T.)] Lab): “Wafer scale integrated circuit on 300 mm wafer” Wikideas1 / CC0 (cropped)
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