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Quantum Photonics Lab
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The lab develops quantum photonic devices using wide-bandgap semiconductors.
AboutAbout the lab
Changing the wavelength of light to build quantum light sources
The Quantum Photonics Lab researches quantum photonic devices, aiming to realize quantum computers and ultra-compact, energy-saving lasers in previously unexplored wavelength ranges.
Its work includes integrating semiconductor lasers with nonlinear optical elements, developing quantum light sources that use quantum structures in wide-bandgap semiconductors, and searching for materials with giant optical nonlinearity.
The lab also develops a technique for evaluating crystal quality that uses a process called multiphoton excitation, and combines these efforts to pioneer new devices and systems.
The lab's website says that anyone who would like an explanation of the lab or a tour should contact the staff.
Key terms
- Wide-bandgap semiconductors
- Semiconductors with a large bandgap (the energy difference electrons need in order to move), such as GaN and ZnO
- Second harmonic generation
- A type of wavelength conversion that produces light with half the wavelength of the input light. The lab uses it to generate far-ultraviolet light
- Quantum light sources
- Light sources that emit the kinds of light needed to realize quantum computers, such as entangled photon pairs and squeezed light
ResearchResearch themes
The lab researches and develops a variety of quantum photonic devices, aiming to realize quantum computers and ultra-compact, energy-saving lasers in previously unexplored wavelength ranges. Its work includes integrating semiconductor lasers with nonlinear optical elements, developing quantum light sources, searching for materials with giant optical nonlinearity, and developing crystal quality evaluation techniques that use multiphoton excitation processes.
*Illustrative imageCompact, high-efficiency deep-ultraviolet light sources
The lab proposes a deep-ultraviolet light source that uses the optical nonlinearity of gallium nitride (GaN). It succeeded in second harmonic generation in a waveguide in which the crystal orientation is periodically inverted, and also succeeded in generating far-ultraviolet light at a wavelength of 229 nm in an AlN waveguide made with technology from Mie University.
*Illustrative imageMicrocavity-based wavelength conversion devices
The lab builds microcavities that integrate the wavelength-converting medium with reflecting mirrors, and proposes that confining light strongly in them enables highly efficient wavelength conversion without inverting the crystal orientation. It has demonstrated operation in GaN crystals and has succeeded in generating light at a wavelength of 234 nm in SrB4O7 crystals.
*Illustrative imageNon-destructive 3D observation of crystal defects
For devices based on GaN semiconductors, the quality of the substrate crystal is important. Using multiphoton excitation photoluminescence microscopy, the lab observes defects such as dislocations in crystals in three dimensions without damaging them, aiming to raise the quality of already high-quality substrates even further.
Quantum light sources in wide-bandgap semiconductors
The lab develops quantum light sources needed to realize quantum computers, such as entangled photon pair sources and squeezed light sources. Besides wavelength conversion devices, it also works on methods that use biexcitons and quantum dots in wide-bandgap semiconductors such as ZnO.
MembersFaculty
The members of the Quantum Photonics Lab consist of faculty, Visiting Professors, part-time staff (administrative assistants), and students in the doctoral, master's, and undergraduate programs.As of 2026
- ProfessorRyuji Katayama
- Assistant ProfessorMasahiro Uemukai
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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: “Scientist measures the optical limiting performance of a nonlinear material - ALC” Adelphi Lab Center Douglas G. LaFon / CC BY 2.0 (cropped)
- Compact, high-efficiency deep-ultraviolet light sources: “Crystal-GaN” Opto-p / Public domain (cropped)
- Microcavity-based wavelength conversion devices: “Microresonator-3” Dodd-Walls Centre for Photonic and Quantum Technologies / CC BY-SA 2.0 (cropped)
- Non-destructive 3D observation of crystal defects: “Multiphoton Microscopy vs Normal Fluorescence” Benjamin Cromey / Public domain (cropped)
- Related lab (Novel Functional Materials Lab): “Optoelectronic Devices” A.dobratiqi / CC BY-SA 3.0 (cropped)
- Related lab (Computational Quantum Information Electronics Lab): “ICM7107x” Mister rf / CC BY-SA 4.0 (cropped)
- Related lab (Integrated Information Design Lab): “CW-01 National Semiconductor Scientific Calculator Watch CMOS-LSI circuit dies” Mister rf / CC BY-SA 4.0 (cropped)
- Related lab (Intelligent Integrated Systems Lab [Graduate School of Information Science and Technology]): “MC705 microcontroller ( )” Sergey G from Russia / CC BY 2.0 (cropped)
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