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Optoelectronics Lab
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The lab expands what light can do in order to build quantum cryptography and quantum computers.
AboutAbout the lab
Pursuing the limitless possibilities of light
The Optoelectronics Lab studies quantum optics and quantum information, as well as nonlinear optics and optical information processing.
Making use of the "quantum nature of light," the lab works on unconditionally secure quantum cryptographic communication, quantum computers that process enormous amounts of data, and quantum measurement with extreme sensitivity.
Focusing on the "wave nature of light," the lab also handles optical information processing technologies such as ultra-high-capacity optical communication, optical phase conjugation, and super-resolution image processing.
Its goal is breakthroughs that greatly change society, beyond what steady incremental improvements can reach.
Key terms
- Quantum key distribution
- A method of sharing an encryption key with another party while verifying that no one has eavesdropped
- Quantum error correction
- A technique that uses extra qubits to detect and correct errors that occur during quantum computation
- Optical phase conjugation
- A phenomenon in which the phase of a light wave is inverted so that the light travels back exactly along its original path
ResearchResearch themes
The research themes fall broadly into quantum optics and quantum information, and nonlinear optics and optical information processing. The lab covers a wide range of optoelectronics, from quantum optical devices to optical memory, optical communication systems, and optical information processing systems.
*Illustrative imageSuperconducting quantum computers
This is the approach whose implementation is currently the most advanced toward useful quantum computers. Aiming at distributed processing for scaling up, the lab works on connecting chips through resonators and microwave communication links, and on implementing quantum algorithms and quantum error correction.
*Illustrative imagePhotonic quantum computers and quantum communication
The lab conducts experiments implementing quantum computation and quantum communication using light. In addition to component technologies for scaling up and integration, it studies light as an interface for connecting atom-based quantum computers for distributed processing.
*Illustrative imageQuantum cryptography
Quantum key distribution is the quantum information technology closest to practical use, allowing users to share keys that are guaranteed not to have been eavesdropped on. The lab pursues research on quantitative guarantees of security, information security technologies using quantum keys, and quantum network technologies.
*Illustrative imageReconfigurable optical elements
Using photorefractive elements, the lab aims to make the functions and wiring of optical elements reconfigurable by themselves to suit the situation. It aims to advance optical information processing and optical communication through multiplexing and demultiplexing in mode-division multiplexed optical communication and dynamic optical branching.
MembersFaculty
The members of the Optoelectronics Lab consist of faculty, researchers, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorHiroki Tokunaga
- Project Associate ProfessorAtsushi Okamoto
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: “Closing in” Simon Whitehead from Australia / CC BY 2.0 (cropped)
- Superconducting quantum computers: “XLD Pulse-Tube-Type Large Frame Dilution Refrigerator Cryostat” OJB Quantum / CC BY 4.0 (cropped)
- Photonic quantum computers and quantum communication: “Bobine Fibres optiques” photography taken by Christophe.Finot / CC BY-SA 3.0 (cropped)
- Quantum cryptography: “Antique Keys Pays basque” Alexmar983 / CC BY-SA 3.0 (cropped)
- Reconfigurable optical elements: “Blaue LED-Fiberglasleuchte” 4028mdk09 / CC BY-SA 3.0 (cropped)
- Related lab (Intelligent Informatics Lab): “Quiet Electric Engine V1 (QUEEN V1) Experiment (GRC-2024-C-06530)” NASA Glenn Research Center / NASA/GRC/Sara Lowthian-Hanna / Public domain (cropped)
- Related lab (Nanosystem Optical Manipulation Lab): “Lasers” 彭家杰 / CC BY-SA 3.0 (cropped)
- Related lab (Information and Communication Photonics Lab): “Red optical fibers” Tyler Nienhouse / CC BY 2.0 (cropped)
- Related lab (Media Dynamics Lab): “Aperture grille closeup” Selçuk Oral (drumex) / CC BY-SA 3.0 (cropped)
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