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Ashida Lab
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A theory lab that opens new frontiers at the boundary between quantum many-body physics and quantum information and quantum optics.
AboutAbout the lab
Using theory to understand the observed quantum world.
The Ashida Lab conducts theoretical research on the boundary between quantum many-body physics and quantum information and quantum optics.
Its main focus is the phenomena that arise when quantum systems made up of many particles are observed or controlled at the microscopic level.
The lab also has broad interests in the corresponding phenomena in classical systems, as well as in machine learning.
The lab uses ideas from field theory, the renormalization group, and quantum information, among others, without being tied to any one method, in order to understand physics.
Key terms
- Quantum many-body system
- A system in which many particles interact with one another and behave according to quantum mechanics
- Entanglement
- A relationship in which the states of multiple particles are linked in a way that cannot be considered separately
- Renormalization group
- A theoretical method for studying how the properties of a physical system change as the scale at which it is viewed is made coarser
NewsLab news
Associate Professor Ashida receives the Frontiers of Science Award
A student receives a poster award at the Summer School for Young Researchers in Condensed Matter Physics
Assistant Professor Yokomizo receives the Young Scientist Award of the Physical Society of Japan
A student receives a poster award at the Summer School for Young Researchers in Condensed Matter Physics
ResearchResearch themes
The lab conducts theoretical research at the boundary between quantum many-body physics and quantum information and quantum optics. It works on opening up new fields and directions, including quantum measurement, open systems, control by quantum light, and the intersection of physics and machine learning.
*Illustrative imageQuantum Measurement and Phase Transitions and Critical Phenomena
The lab theoretically studies quantum many-body phenomena induced by quantum measurement. Focusing on entanglement, it uses methods from field theory and the renormalization group to analyze the phase transitions and criticality that measurement causes.
*Illustrative imagePhysics of Nonequilibrium Open Systems
The lab has investigated quantum many-body systems observed at the level of single atoms, aiming to open up a new field called nonequilibrium open systems. It is clarifying new phenomena that arise from measurement backaction, as well as the properties of non-Hermitian systems.
*Illustrative imageControl of Quantum Many-Body Systems with Quantum Light
The lab has theoretically shown that the phases of matter can be controlled by strongly coupling a quantum many-body system to a quantized electromagnetic field. It found a new transformation that disentangles light and matter, and built a framework that can be used regardless of the strength of the interaction.
*Illustrative imagePhysics and Machine Learning
Using the idea of the renormalization group, the lab built a generative model that turns noise into data. It is also working on applying machine learning to open systems, and has proposed a new benchmark task for deep reinforcement learning.
MembersFaculty
The members of the Ashida Lab consist of faculty, doctoral and master's students, and administrative staff.As of 2026
- Associate ProfessorYuto AshidaPublications ↗
- Assistant ProfessorKazuki YokomizoPublications ↗
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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: “Superconducting Metamaterial Chip 002” OJB Quantum / CC BY 4.0 (cropped)
- Quantum Measurement and Phase Transitions and Critical Phenomena: “Laboratorium FAMO UMK A 234” Ciacho5 / CC BY-SA 4.0 (cropped)
- Physics of Nonequilibrium Open Systems: “Cloud of ultracold atoms levitated in a magneto-optical trap” Balping / CC BY-SA 4.0 (cropped)
- Control of Quantum Many-Body Systems with Quantum Light: “Dye laser alignment intra-cavity beam @ 589nm” Zaereth / CC BY-SA 4.0 (cropped)
- Physics and Machine Learning: “Artificial Neural Network with Chip” mikemacmarketing / photo on flickr / CC BY 2.0 (cropped)
- Related lab (Tsuji Lab): “Cloud of ultracold atoms levitated in a magneto-optical trap” Balping / CC BY-SA 4.0 (cropped)
- Related lab (Quantum Information Lab): “Quantum Computer with Dark Background 001” OJB Quantum / CC BY 4.0 (cropped)
- Related lab (Katsura Lab): “Icosahedrite Diffraction Pattern” Paul Steinhardt / CC BY-SA 4.0 (cropped)
- Related lab (Ueda Lab): “JILA's strontium optical atomic clock” Sebastian Blatt, JILA, University of Colorado / Public domain (cropped)
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