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Photonics Lab
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The lab uses neutrons and cold atoms and molecules to test the foundations of physics experimentally.
AboutAbout the lab
Controlling light and atoms to test the foundations of quantum physics
The Photonics Lab studies methods for extracting the information contained in light waves and photons accurately and efficiently.
With quantum optics and matter-wave optics as keywords, the lab carries out experiments that test fundamental phenomena of quantum mechanics.
These include experiments using neutron interferometers and precision measurements of atoms and molecules cooled with lasers.
The lab also conducts joint research with private companies, research institutes, and other universities.
Key terms
- Matter wave
- A wave-like property of particles such as neutrons and atoms. When superposed, matter waves form interference fringes
- Laser cooling
- A technique that cools atoms to near absolute zero by shining light on them to exchange momentum
- Interferometer
- A device that superposes two split waves and reads small differences from shifts in the fringe pattern
ResearchResearch themes
The lab aims to extract the information contained in light waves and photons accurately using new techniques. It carries out quantum optics experiments using matter waves, and experiments on ultracold atoms and molecules produced by laser cooling.
*Illustrative imageTesting quantum mechanics with neutrons
The lab investigates the foundations of quantum mechanics using interferometers and polarization analyzers that employ neutron matter waves. It experimentally tests phenomena unique to quantum mechanics, such as the "quantum Cheshire cat," in which a particle and its property are spatially separated, and uncertainty relations.
*Illustrative imageAtoms and molecules cooled by lasers
Laser cooling brings atomic gases close to absolute zero, and the atoms are then associated to form ultracold molecules. The lab performs precision spectroscopy on these molecules to test whether the electron-to-proton mass ratio is constant.
MembersFaculty
The members of the Photonics Lab consist of faculty and doctoral, master's, and undergraduate students.As of 2026
- ProfessorYuji Hasegawa
- Associate ProfessorJun Kobayashi
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: “Double refraction” The High Fin Sperm Whale / CC BY-SA 3.0 (cropped)
- Testing quantum mechanics with neutrons: “Young's slits” Graham Beards / CC BY-SA 4.0 (cropped)
- Atoms and molecules cooled by lasers: “Cloud of ultracold atoms levitated in a magneto-optical trap” Balping / CC BY-SA 4.0 (cropped)
- Related lab (Quantum Functional Engineering Lab): “Optical Therapeutics and Medical Nanophotonics Laboratory ( )” The U.S. Food and Drug Administration / Public domain (cropped)
- Related lab (Semiconductor Quantum Engineering Lab): “Gallium Arsenide (GaAs) 2" wafer” La2O3 / CC BY-SA 3.0 (cropped)
- Related lab (Optical Quantum Physics Lab): “532nm” Netweb01 / CC BY-SA 3.0 (cropped)
- Related lab (Topology Science and Engineering Lab): “Möbius strip” David Benbennick / CC BY-SA 3.0 (cropped)
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