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Arai Lab
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The lab makes the invisible visible with diamond quantum sensors.
AboutAbout the lab
Quantum sensing × informatics
The Arai Lab studies quantum sensing using "NV centers" in diamond.
By combining quantum sensing with computational informatics, the lab aims for innovation that it calls "quantum transformation."
The lab works to develop quantum sensors that precisely measure nanoscale magnetic fields and temperature into measurement tools that can be used outside the laboratory.
Students can experience the whole research process, from theory and numerical simulation to building equipment, experiments, data analysis, and presentations.
Key terms
- NV center
- A defect in a diamond crystal in which a nitrogen atom replaces a carbon atom and the adjacent site is vacant. It responds sensitively to magnetic fields and other quantities
- Quantum sensing
- Technology that uses the quantum properties of electrons and atoms to measure magnetic fields, temperature, and other quantities with extremely high precision
- Hydrogen embrittlement
- A phenomenon in which hydrogen enters a metal, making it brittle and prone to cracking
NewsLab news
A paper on NV centers in a diamond anvil cell was posted on arXiv
A paper on controlling spins with boron-doped diamond circuits was posted on arXiv
A paper on fast control of the nitrogen-14 spin of NV centers was published
Associate Professor Arai received the 2023 Suematsu Award
ResearchResearch themes
The lab conducts research that links fundamental physics, quantum devices, materials, and applications to society. Centered on quantum sensing with NV centers in diamond, it works on interconnected research themes.
*Illustrative imageQuantum measurement and control, and machine learning
The lab develops techniques to measure nanoscale magnetic fields, temperature, and strain using NV center quantum sensors. It aims to combine these with machine learning to turn them into practical measurement tools.
*Illustrative imageDiamond quantum electronics
This research uses diamond as a foundation for quantum devices that work even at high temperatures, under high pressure, and in harsh chemical environments. The lab works on circuits made of boron-doped diamond and on quantum sensors that withstand extreme environments.
*Illustrative imageLooking inside materials with quantum sensors
The lab investigates quantum states of matter that cannot be seen with ordinary measurements, by using quantum sensors to capture magnetic fields, currents, and spin arrangements. Targets include superconductors and magnetic materials under extreme conditions.
*Illustrative imageSensing for monitoring the environment and infrastructure
This research aims to detect damage early in the sea, underground, and in industrial components. The lab works on a method to measure the pH of seawater with quantum sensors, and on nondestructive methods to find tiny defects and hydrogen embrittlement in metals.
MembersFaculty
The Arai Lab consists of faculty, postdoctoral researchers, technical support staff, administrative support staff, and doctoral, master's, and undergraduate students.As of 2026
- Associate ProfessorKeigo AraiPublications ↗
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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: “Irradiated spot of diamond with high concentration of nitrogen-vacancy centers” Lillian B. Hughes ほか
/ CC BY 4.0 (cropped) - Quantum measurement and control, and machine learning: “Field lines around magnets” Tangopaso / Public domain (cropped)
- Diamond quantum electronics: “CVD diamond” Kugel / CC BY-SA 3.0 (cropped)
- Looking inside materials with quantum sensors: “Superconductor-levitation” Pongkaew / CC0 (cropped)
- Sensing for monitoring the environment and infrastructure: “Rust Pits in surface of Steel Water Pipe(GN04592)” State Government Photographer / CC0 (cropped)
- Related lab (鈴木研究室): “Terahertz freq. metamaterial modulator” Hou-Tong Chen (Los Alamos National Laboratory) / Public domain (cropped)
- Related lab (中村研究室): “Ultrasonic motor” Yorkshire Terrier / Public domain (cropped)
- Related lab (當麻研究室): “Au nanoparticles” Nikonianman / CC BY-SA 4.0 (cropped)
- Related lab (德田研究室): “Close-up of a polycrystalline solar PV panel” Guilhem Vellut / CC BY 2.0 (cropped)
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