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Horikiri-Ozawa Lab
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The lab studies quantum technologies such as quantum communication using light and matter.
AboutAbout the lab
Quantum technology built on light and matter.
The Horikiri-Ozawa Lab studies quantum technologies that use light and matter.
Drawing on quantum information science, which emerged from the fusion of quantum mechanics and information theory, the lab mainly studies long-distance quantum communication technologies aimed at quantum cryptographic communication and cloud quantum computing.
Associate Professor Ozawa specializes in precision spectroscopy experiments on atoms and molecules using lasers, and also develops frequency comb light sources and ion traps.
The lab's website presents it under the name "Quantum Optics Research Group."
Key terms
- Quantum memory
- A mechanism that stores the quantum state of light as a state of matter. It is important for quantum repeaters in long-distance quantum communication.
- Atomic frequency comb
- A technique that creates sharp, comb-like absorption peaks in an absorption spectrum. It is used to store multiplexed optical pulses.
- Parametric down-conversion
- A nonlinear optical process. When it takes place inside an optical cavity, it generates entangled photons with a narrow spectrum.
- Sum-frequency generation
- A nonlinear optical process used for wavelength conversion. It converts telecom-wavelength light to a wavelength that a quantum memory can absorb.
NewsLab news
A paper on storing frequency-multiplexed photons in a quantum memory was published in Applied Physics Letters
Prof. Horikiri received the Excellent Research Award in Yokohama National University's Outstanding Researcher Awards for FY2025 (Reiwa 7)
A paper co-authored by a master's student and SONY Corporation was published in Optics Express
A master's student received a Student Award at ALPS2025
A joint research agreement was concluded toward the practical use of scalable quantum information processing
ResearchResearch themes
From the standpoint of quantum information science, the lab mainly pursues research on long-distance quantum communication technologies, with applications such as quantum cryptographic communication and cloud quantum computing in view. It also works on precision spectroscopy experiments on atoms and molecules using lasers, and on the development of frequency comb light sources and ion traps.
*Illustrative imageEntangled Photon Pair Sources
To narrow the spectral width without lowering the generation rate of entangled photons, the lab performs parametric down-conversion inside an optical cavity. It has realized a photon-pair source at telecom wavelengths that couples efficiently to quantum memories.
*Illustrative imageWavelength Conversion Matched to Quantum Memories
Photons at telecom wavelengths, which can be transmitted through optical fiber with low loss, differ from the absorption wavelength of praseodymium-doped YSO crystals (around 606 nm), so the memory cannot accept them as they are. This makes it necessary to develop a wavelength converter based on sum-frequency generation.
*Illustrative imageMultiplexable Quantum Memories
To increase the communication rate, the lab studies multiplexable quantum memories using rare-earth-doped crystals. With a technique called an atomic frequency comb, which creates comb-like absorption peaks in the absorption spectrum, it stores trains of optical pulses and retrieves them with high efficiency as photon echoes.
*Illustrative imageLaser Frequency Stabilization
To couple entangled photons efficiently to quantum memories, the lab stabilizes the frequencies of lasers and other light sources. Together with the Hong Lab in the Physical Engineering course, it also studies systems such as one that transmits an excitation laser through optical fiber and, by beat measurement with an optical comb, continuously stabilizes it to the transition frequency of a remote quantum memory.
MembersFaculty
The members of the Horikiri-Ozawa Lab consist of faculty, project faculty, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorTomoyuki Horikiri
- Associate ProfessorAkira Ozawa
- Specially Appointed Faculty (Assistant Professor)Daisuke Yoshida
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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: “Full wafer of Intel quantum computers” Steve Jurvetson from Menlo Park, USA / CC BY 2.0 (cropped)
- Entangled Photon Pair Sources: “Entangled Photon Generation for Liquid Crystal Qubits Image” Alexander202511 / CC BY-SA 4.0 (cropped)
- Wavelength Conversion Matched to Quantum Memories: “Lasers” 彭嘉傑 / CC BY 2.5 (cropped)
- Multiplexable Quantum Memories: “RbMetal” Dnn87 / CC BY 3.0 (cropped)
- Laser Frequency Stabilization: “Glass nanoparticle suspended in an optical cavity” James Millen (UCL Physics & Astronomy) / CC BY 2.0 (cropped)
- Related lab (Hong-Akamatsu-Asakawa Lab): “Optical atomic clock ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (Kosaka-Sekiguchi Lab): “Alice in BBN laboratory - DARPA Quantum Network, January 2003” Daderot / CC0 (cropped)
- Related lab (Katayama-Tahara Lab): “Spectroscopy; Terahertz spectroscopy; Biomolecule dynamics ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (Kawamura Lab): “Muscovite structure 100” Kent G. Budge / CC0 (cropped)
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