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Aoki Lab
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A lab that experimentally verifies the quantum nature of light and connects it to quantum technology.
AboutAbout the lab
Verifying the quantum nature of light in the laboratory
The Aoki Lab combines quantum optics as a branch of physics with the development of nanophotonic devices as applied physics.
At its core is research on cavity QED, which consists of light confined in an optical cavity and atoms interacting with it.
The lab has independently developed cavities that use optical fibers thinner than the wavelength of light (nanofibers), and couples them to atoms that have been cooled and trapped with lasers.
By pioneering techniques to generate, measure, and manipulate quantum states to the extreme, the lab aims at applications in quantum information and quantum metrology.
Key terms
- Cavity QED
- A system in which light confined in an optical cavity interacts with atoms inside it. It serves as a stage for experiments in quantum optics
- Nanofiber
- An optical fiber thinner than the wavelength of light. It can interact directly with atoms through the light that extends just outside its surface
- Qubit
- The unit that carries information in a quantum computer. It can be in a superposition of 0 and 1
NewsLab news
Proposal for a quantum gate connecting light and atoms published in Phys. Rev. Lett.
Lab paper published in Optics Express
Lab paper published in J. Opt. Soc. Am. B
Lab paper published in Physical Review Applied
Prof. Aoki receives the Waseda University Research Award (Promotion of Large-Scale Research Projects)
ResearchResearch themes
Experiments in the lab center on cavity QED systems, which consist of light confined in an optical cavity and atoms. Because the quantum nature of light and matter appears more clearly the better the cavity confines light, the lab develops its own cavities and pursues techniques for freely controlling quantum states.
*Illustrative imageNanofiber cavity QED systems
In a nanofiber, the amplitude of the evanescent light that extends near the surface is large, so its guided mode can interact efficiently with a single atom. The lab has developed a cavity that combines a high-transmission nanofiber with fiber Bragg gratings, and couples it to atoms cooled and trapped with lasers.
*Illustrative imageNanofiber-based quantum computing
In this cavity, many atoms can be lined up in a row along the fiber axis while the coupling between each atom and the cavity remains strong. By irradiating each atom individually with a laser to manipulate and measure its quantum state, the lab aims to build a multi-qubit quantum computer.
*Illustrative imageDistributed quantum computers
The lab has realized a "coupled cavity QED system" in which multiple cavity QED systems are connected with low loss using only optical fibers. By linking many of these as units, the number of qubits can be expanded without being limited by the constraints of a single unit, which also leads to long-distance quantum communication networks.
MembersFaculty
The members of the Aoki Lab consist of faculty, researchers, visiting and invited researchers, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorTakao Aoki
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: “Fibres optique” Pastèque24 / CC BY-SA 4.0 (cropped)
- Nanofiber cavity QED systems: “Erbium-doped fiber with green light” Ximeg / CC BY-SA 3.0 (cropped)
- Nanofiber-based quantum computing: “QuEra Aquila Magneto-Optical Trap 2” QuEra Computing, Inc. / CC BY 4.0 (cropped)
- Distributed quantum computers: “Fiber optic illuminated” Hustvedt / CC BY-SA 3.0 (cropped)
- Related lab (福原研究室): “Cloud of ultracold atoms levitated in a magneto-optical trap” Balping / CC BY-SA 4.0 (cropped)
- Related lab (小澤研究室): “World First Hiperboloid structure named Shukhov Tower in Polibino” Arssenev / CC BY-SA 4.0 (cropped)
- Related lab (片岡研究室): “Fermi Gamma-ray Space Telescope spacecraft model” NASA / Public domain (cropped)
- Related lab (北研究室): “5C2A5953R - – Silicon Wafer 20200519” Rob Bulmahn / CC BY 2.0 (cropped)
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