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Quantum Device [Otsuka] Lab
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The lab uncovers quantum effects in nanostructures and applies them to quantum devices.
AboutAbout the lab
Quantum effects in nanostructures, from fundamentals to applications.
The Quantum Device (Otsuka) Lab studies the fundamental physics of nanostructures and quantum effects, and their application to semiconductor quantum technologies.
This research is interesting as fundamental physics that explores how nature works, and it also leads to new technologies such as quantum computing, quantum electronics, and spintronics.
After joining the lab, students take part in cutting-edge research while acquiring basic knowledge and skills. Once they are accustomed to the work, they gain experience carrying out everything on their own, from planning to publishing results.
The lab welcomes new members regardless of their previous background, and lab visits are also welcome.
Key terms
- Semiconductor quantum dot
- A structure in which electrons are confined to a tiny region inside a semiconductor. The spin of an electron confined there is used as a qubit.
- Qubit
- The unit that carries information in a quantum computer. Computation uses states that have quantum properties.
- Bayesian optimization
- A method that chooses the next conditions to try based on past measurement results, searching for good conditions with few trials.
ResearchResearch themes
The Quantum Device (Otsuka) Lab studies new physical phenomena using solid-state nanostructures and creates new materials and devices. Its work covers research on measuring electronic states, research on quantum devices such as qubits, and research on a development platform that uses data science.
*Illustrative imageMeasuring electronic states in nanostructures
Using a high-speed microprobe developed in-house, the lab measures local electronic states in solid-state nanostructures with high energy resolution, low disturbance, and high speed. The findings are applied to research on next-generation electronic devices.
*Illustrative imageQuantum devices based on semiconductor quantum dots
With qubit devices based on semiconductor quantum dots, the lab works to improve the precision of quantum gate operations and to scale up quantum systems. The goal is to realize useful quantum algorithms, quantum simulation, and quantum communication.
*Illustrative imageMaterials and device development using data science
The lab introduces Bayesian optimization and machine learning into the analysis of fine solid-state materials with the high-speed microprobe and into the parameter optimization of large-scale quantum devices. It is working to build an efficient development platform technology.
MembersFaculty
The members of the Quantum Device (Otsuka) Lab consist of faculty members, a Project Assistant Professor, a cross-appointed Professor, a Visiting Professor, doctoral, master's, and undergraduate students, technical assistants, and administrative assistants.As of 2026
- Associate ProfessorTomohiro Otsuka
- ProfessorYusuke Kozuka
- Project Assistant ProfessorChaojing Lin
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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: “Helium dilution cryostat” User:Wiso / Public domain (cropped)
- Measuring electronic states in nanostructures: “Scanning probe microscope ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Quantum devices based on semiconductor quantum dots: “Quantum Computer with Dispersive Background” OJB Quantum / CC BY 4.0 (cropped)
- Materials and device development using data science: “139 Server Room 01” Indrajit Das / CC BY-SA 3.0 (cropped)
- Related lab (Bioelectromagnetic Information [Ishiyama-Goto] Lab): “George Simpson magnetometer” Herbert Ponting / Public domain (cropped)
- Related lab (Future Electronics Foundation Creation [Kuroda] Lab): “FUGA 18 Retina” Mister rf / CC BY-SA 4.0 (cropped)
- Related lab (Yamashita-Kato Lab): “Measuring a qubit leaves no room for error” FMNLab / CC BY 4.0 (cropped)
- Related lab (Nano Integrated Devices and Systems Lab): “Vectra-xa-motherboard-xray hg” Hannes Grobe / CC BY-SA 4.0 (cropped)
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