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Bamba Lab
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A lab that uses theory to explore uncharted phenomena arising from the interaction between light and matter.
AboutAbout the lab
Searching for light-related physical phenomena no one has ever seen.
The Bamba Lab uses the methods of theoretical physics to discover and explain previously unknown phenomena that arise from the interaction between light and matter.
Its research centers on a phenomenon called the “superradiant phase transition,” which occurs through light–matter interaction.
The lab states that research on light is thriving in industry and applications, but few theoretical researchers pursue the underlying principles of the phenomena.
The lab's December 2023 guide for lab assignment also lists the analysis of joint experiments with experimental groups in the United States and elsewhere as an example of a research theme.
Key terms
- Superradiant phase transition
- A phenomenon arising from the interaction between light and matter. It has been found as a “stationary wave” that appears spontaneously inside a magnet
- Ultrastrong coupling
- A state in which the coupling between light and matter is particularly strong
- Quantum squeezing
- A state in which the quantum fluctuations of light or similar systems are suppressed for a particular quantity
NewsLab news
Published an article in the journal of the Physical Society of Japan explaining light in thermal equilibrium and magnets out of equilibrium
Gave guidance on fiscal 2024 lab assignment to third-year students at Yokohama National University
ResearchResearch themes
The lab aims to discover and explain phenomena arising from the interaction between light and matter that no one has yet seen. Using methods of theoretical physics, it searches for new phenomena in electromagnetic fields interacting with matter, both out of equilibrium and in thermal equilibrium.
*Illustrative imageQuantum states of light in thermal equilibrium
A 2023 paper addresses realizing quantum squeezing in a thermal equilibrium state through ultrastrong coupling between light and matter. If this can be realized, it is said to enable applications in quantum optics and information technology that were not previously possible.
*Illustrative imageConfirmation of the superradiant phase transition
In a 2022 paper, a collaboration involving Associate Professor Bamba and others confirmed the “magnonic superradiant phase transition” for the first time. It is described as a step toward connecting quantum optics, thermodynamics, and solid state physics.
*Illustrative imageObserving physical effects of light–matter coupling
A 2018 paper used light–matter coupling to clearly observe the vacuum Bloch-Siegert shift, a physical effect that had been difficult to observe. It was a collaborative study in which Associate Professor Bamba is also an author.
*Illustrative imageSuperradiant phase transition in superconducting circuits
A 2016 paper identified a superconducting circuit system in which a superradiant phase transition can be realized. The lab's website describes the phenomenon as one that could greatly change how energy is generated and used.
MembersFaculty
The Bamba Lab's members consist of faculty, doctoral students, master's students, and undergraduate students.As of 2026
- Associate ProfessorMotoaki Bamba
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: “Cavity Optomechanics” Schmoele / CC BY-SA 3.0 (cropped)
- Quantum states of light in thermal equilibrium: “Gluehlampe 01 KMJ” KMJ / CC BY-SA 3.0 (cropped)
- Confirmation of the superradiant phase transition: “Liquid Crystal Phase Transition” KarlGaff / CC BY 4.0 (cropped)
- Observing physical effects of light–matter coupling: “Nested Cavity” Mahmoud Selim334 / CC0 (cropped)
- Superradiant phase transition in superconducting circuits: “Superconducting Quantum Chip with Dispersive Background” OJB Quantum / CC BY 4.0 (cropped)
- Related lab (Kosaka-Sekiguchi Lab): “Alice in BBN laboratory - DARPA Quantum Network, January 2003” Daderot / CC0 (cropped)
- Related lab (Minamino-Bronner Lab): “Groeeser.Hamamatsu.Photomultiplier” Bautsch / CC0 (cropped)
- Related lab (Ohno (Shinya) Lab): “Atomic Force Microscope 02” Gannu03 / CC BY-SA 4.0 (cropped)
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