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Haruka Tanji Lab
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A lab that couples laser-cooled atoms and light in an optical cavity, aiming to develop quantum light sources.
AboutAbout the lab
Toward new quantum technologies through quantum state control of light and atoms.
The Haruka Tanji Lab conducts experimental research in cavity quantum electrodynamics (Cavity QED), a field in which the quantum-mechanical properties of light appear prominently through interaction with matter.
The lab confines laser-cooled gaseous atoms (tens of μK) inside an optical cavity to induce strong interactions between atoms and photons, and its research is based on controlling the quantum states of light and atoms.
Through two approaches, developing "quantum light sources" and controlling matter with extremely weak light, the lab aims to create new quantum technologies.
Recently, the lab has also begun observing the faint light emitted by living organisms.
Key terms
- Laser cooling
- Cooling gaseous atoms to temperatures as low as tens of μK using laser light
- Optical cavity
- A device that confines light between mirrors of very high reflectivity. Matter and photons interact strongly inside it
- Quantum light source
- A light source that can generate various quantum states of light, including photon-number states and entangled states
- Vacuum fluctuations
- Fluctuations that exist even in space containing no photons. This lab aims to control matter using them
NewsLab news
A master's student won an Excellent Presentation Award at the Physics Engineering Program master's thesis presentation
Associate Professor Haruka Tanji received the 20th Japan Society for the Promotion of Science Prize
ResearchResearch themes
Aiming to create new quantum technologies based on quantum state control of light and atoms, the lab uses strong interactions between photons and cold atoms confined in an optical cavity. Its research proceeds through the development of quantum light sources, control of matter with extremely weak light, and spectroscopy of faint bioluminescence.
*Illustrative imageDeveloping quantum light sources with cold atoms
The lab uses an ensemble of atoms cooled to about tens of μK with laser light and trapped in an optical cavity. It aims to realize a quantum light source that can generate a variety of quantum states of light, including photon-number states and entangled states, in a single experimental system.
*Illustrative imageControlling matter with extremely weak light
In an optical cavity built with extremely high-reflectivity mirrors, matter and photons interact strongly. The lab aims to control matter with single photons and vacuum fluctuations, and to realize various quantum devices that apply this.
*Illustrative imageSpectroscopy of faint bioluminescence
To elucidate the mechanism of a new bioluminescence phenomenon discovered in the Nakamura Lab and the Maki Lab at the Graduate School of Informatics and Engineering, the lab is jointly developing a measurement device that performs spectroscopy of faint light emitted from mouse liver.
MembersFaculty
The members of the Haruka Tanji Lab are faculty members, master's and undergraduate students, research assistants and administrative assistants, and collaborators.As of 2025
- Associate ProfessorHaruka Tanji
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: “Optical cavities” No machine-readable author provided. Fffred~commonswiki assumed (based on copyright claims). / Public domain (cropped)
- Developing quantum light sources with cold atoms: “Double Optical Ring Resonator” Lamboman2008 / CC BY-SA 3.0 (cropped)
- Controlling matter with extremely weak light: “Single photon probability question.” Illusterati / CC BY-SA 3.0 (cropped)
- Spectroscopy of faint bioluminescence: “Bioluminescence of Omphalotus olearius from Lausanne, Switzerland” The Brook / CC BY-SA 4.0 (cropped)
- Related lab (張 贇 研究室): “ALE4077” Alessiocoser / CC BY 4.0 (cropped)
- Related lab (森永 実 研究室): “Single Photon Detectors ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (武者 満 研究室): “Baffled LIGO Scientists” Nkij / CC BY 4.0 (cropped)
- Related lab (遠藤 晋平 研究室): “Atomic-nucleus-3435” Yasminperry2020 / CC BY-SA 4.0 (cropped)
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