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Computer Systems Architecture Lab
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A computer architecture lab that builds computers for AI using photonic and superconducting devices.
AboutAbout the lab
New computers built on innovative devices
The Computer Systems Architecture Lab aims to realize computers for AI applications using innovative devices such as photonic and superconducting devices.
Unconstrained by conventional technology, the lab is also working on inventing computers that run on zero energy.
The lab's research spans the layers of algorithms, architecture, circuits, and devices, and is carried out in collaboration with researchers inside and outside the university.
The lab's website is published jointly with the group of Associate Professor Takeaki Yajima, under the name "Constructive Electronics Lab: Yajima-Kawakami Lab."
Key terms
- Superconducting single flux quantum circuit
- An electronic circuit that uses the smallest unit of magnetic flux in a superconductor (a single flux quantum) as a signal
- Reversible logic gate
- A logic gate whose input can be uniquely traced back from its output. It computes without discarding information
- Energy harvesting
- Collecting energy from the surrounding environment, such as light, heat, and vibration, and using it as electric power
- LiDAR
- A system that shines laser light on surrounding objects to measure their distance and shape
NewsLab news
A master's student received an Outstanding Student Award from the Graduate School of Information Science and Electrical Engineering
A master's student received a Kyushu University Student Award
A master's student received the Best Student Paper Award at OECC/PSC 2025
ResearchResearch themes
This lab aims to realize computers for AI applications using innovative devices such as photonic and superconducting devices. Across the technology layers of algorithms, architecture, circuits, and devices, the lab is also advancing the invention of computers that run on zero energy, overturning conventional wisdom.
*Illustrative imageZero-Energy Computers Driven by Noise
The lab takes on the question of whether information processing truly requires energy. It drives clock-switched superconducting single flux quantum circuits with thermal noise and performs computation with reversible logic gates, aiming for zero-energy computing.
*Illustrative imageOptoelectronic Accelerators That Compute with Light
Advances in silicon photonics and nanophotonics are making it possible to integrate large numbers of optical elements. Among computers that carry information with photons, the lab aims to realize optoelectronic accelerators that combine the speed of light with low power consumption.
*Illustrative imageUltra-Low-Power Chips Powered by Energy Harvesting
To power sensor nodes by energy harvesting and have them adapt to each environment, the lab is building reinforcement learning computers for energy-harvesting power supply circuits. It aims for fully self-sufficient energy harvesting systems that adapt by themselves to changes in the environment.
*Illustrative imageDedicated Computers for Autonomous Driving
Autonomous driving requires high-performance, low-power embedded processors, and spatial recognition with LiDAR processes large amounts of data in a short time. The lab is building a dedicated computer that collects in-vehicle sensor data and processes it at high speed, using real measurement data from collaboration with companies as well as simulation.
MembersFaculty
According to the lab's website, the members of the Computer Systems Architecture Lab, together with the group of Associate Professor Takeaki Yajima, consist of faculty members, staff, doctoral, master's, and undergraduate students, and research students.As of 2026
- Associate ProfessorSatoshi Kawakami
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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: “Raspberry Pi 5 Hailo AI Accelerator Module” RetroEditor / CC BY 4.0 (cropped)
- Zero-Energy Computers Driven by Noise: “Perlin noise example” Lord Belbury / CC0 (cropped)
- Optoelectronic Accelerators That Compute with Light: “FMN Lab electro-optical integrated modulator” FMNLab / CC BY 4.0 (cropped)
- Ultra-Low-Power Chips Powered by Energy Harvesting: “Energy Harvesting Assault Pack ( )” U.S. Army CERDEC / Public domain (cropped)
- Dedicated Computers for Autonomous Driving: “Ouster OS1-64 lidar point cloud of intersection of Folsom and Dore St, San Francisco” Daniel L. Lu / CC BY 4.0 (cropped)
- Related lab (Quantum Device Engineering Lab): “DoubleQuantumDot” Vitaly Golovach / Public domain (cropped)
- Related lab (Electronic Materials Lab): “Propagation of light through the core of an optical fiber, Macro visualization, Demonstration of prof Angel Toshkov to students.” AZToshkov / CC BY-SA 3.0 (cropped)
- Related lab (Constructive Electronics Lab): “Neuromorphic Nanowire Network” DrHughManning / CC BY-SA 4.0 (cropped)
- Related lab (Bio-Inspired Microsystems Lab): “Epson micro flying robot - Flickr - yuhui” yuhui from Singapore, Singapore / CC BY-SA 2.0 (cropped)
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