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Kodera Lab
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The lab works to realize quantum computers using semiconductors such as silicon.
AboutAbout the lab
Developing foundational technologies and elucidating the physics for quantum computers
The Kodera Lab conducts research to realize quantum computers using semiconductors such as silicon.
Electrons and other particles are confined in fine semiconductor structures called quantum dots, and their spins are used as qubits.
A strength of this approach is that it can draw on the semiconductor manufacturing technology used in PCs and smartphones.
To operate quantum computer devices, the lab conducts experiments using refrigerators that can cool to near absolute zero and low-noise control and measurement equipment.
Key terms
- Qubit
- The basic unit of information in a quantum computer. It can also take a superposition of two states
- Quantum dot
- A fine semiconductor structure that confines electrons and other particles in an extremely small region
- Spin
- A property of electrons and other particles that resembles a tiny magnet. The difference in its orientation is used as information
NewsLab news
A master's student received the Outstanding Master's Thesis Award from the Electrical and Electronic Engineering Course
In collaboration with Hitachi and others, the lab achieved high-precision control of qubits in natural silicon
A student received the Outstanding Undergraduate Student Award from the Department of Electrical and Electronic Engineering
A master's student received the Outstanding Master's Thesis Award from the Department of Electrical and Electronic Engineering
ResearchResearch themes
The lab aims to realize quantum computers using semiconductors such as silicon. It pursues both engineering research on foundational technologies leading to quantum computers and fundamental academic research to elucidate the related physics.
*Illustrative imageQubit Readout Technology
The lab studies circuits that detect the extremely small signals from quantum dots quickly, with suppressed noise, at cryogenic temperatures. The aim is to establish readout technology that can scale to large numbers of qubits.
*Illustrative imageAutomated Tuning of Quantum Dots with AI
Finding the optimal gate voltages for each quantum dot is currently done by skilled researchers over several days. The lab incorporates machine learning (AI) algorithms to automate this tuning.
*Illustrative imageReading States via Radio-Frequency Reflection
This is a method that applies radio-frequency signals to a qubit and reads out its state from changes in how the signal is reflected. The lab seeks to solve challenges of matching circuits and wiring at low temperatures, drawing also on knowledge of electric circuits and microwave engineering.
*Illustrative imageManipulating Hole Spins in Silicon
Hole spins in silicon can be manipulated with an AC electric field alone and require no extra structures, which is advantageous for integration. The lab aims to realize this manipulation in quantum dots made by etching SOI substrates.
MembersFaculty
The members of the Kodera Lab consist of faculty, researchers, technical support staff, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorTetsuo KoderaPublications ↗
- Assistant ProfessorShunsuke OtaPublications ↗
VoicesStudent voices
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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: “Quantum lab ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Qubit Readout Technology: “Drop-impact” Roger McLassus / CC BY-SA 3.0 (cropped)
- Automated Tuning of Quantum Dots with AI: “Go (13×” Dietmar Rabich / CC BY-SA 4.0 (cropped)
- Reading States via Radio-Frequency Reflection: “Bat cave in El Maviri Sinaloa - Mexico” Tomascastelazo / CC BY-SA 4.0 (cropped)
- Manipulating Hole Spins in Silicon: “Spinning top shadow” Armenak Margarian / CC BY-SA 4.0 (cropped)
- Related lab (竹本・
清田研究室): “Stator Winding of a BLDC Motor” Medvedev / CC BY-SA 3.0 (cropped) - Related lab (宮本智之研究室): “Fluorescence in calcite” Jan Pavelka / CC BY-SA 4.0 (cropped)
- Related lab (西山研究室): “Laser diode chip” NASA
（PD NASA。 作者欄なし） / Public domain (cropped) - Related lab (間中・
田口研究室): “Organic crystal 1” RemiJos / CC BY 4.0 (cropped)
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