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Furusawa Lab
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The lab aims to build fault-tolerant optical quantum computers by using the quantum properties of light.
AboutAbout the lab
A quantum computer that computes with waves of light
The Furusawa Lab uses methods from quantum optics to research optical quantum computers, which carry information on waves of light to perform computation.
The core technology is "quantum teleportation," which transfers a quantum state intact to another location.
Prof. Furusawa and colleagues were the first in the world to succeed in this experiment, and the lab is now working toward a quantum computer that can be used for any computation and can also correct errors.
The lab's work ranges from experiments that verify theory and principles to the integration of optical circuits with a view to practical use.
Key terms
- Quantum teleportation
- A technology that uses quantum entanglement to transfer a quantum state (wave function) to a distant location
- Quantum entanglement
- A state unique to quantum systems in which multiple particles or beams of light are linked so that they cannot be considered separately, even when far apart
- Squeezed light
- Special light in which part of the quantum fluctuation (noise) of the light is suppressed. It is a key resource for optical quantum computers
NewsLab news
A doctoral student received the Grand Prize of the Young Researcher Poster Award at the Moonshot Goal 6 Summer Camp
A doctoral student received the Outstanding Student Presentation Award from the Physical Society of Japan
A student received the Shoji Tanaka Award (Outstanding Master's Thesis Award)
A student received the Department of Applied Physics Outstanding Bachelor's Thesis Award and the Dean of the School of Engineering Award
Succeeded, jointly with NTT and others, in generating squeezed light with a waveguide-type optical device
ResearchResearch themes
With the ultimate goal of realizing a universal quantum computer that can also correct errors, the lab researches optical quantum computers that apply quantum teleportation technology. Using light makes it possible to realize a quantum computer that operates at room temperature and can perform large-scale computation.
*Illustrative imageLarge-scale quantum computation with time-domain multiplexing
This approach prepares a large-scale entangled state called a "cluster state" and performs various computations simply by changing how it is measured. The lab aims to scale up through "time-domain multiplexing," which places information on light divided into time slots.
*Illustrative imageDevelopment of the cubic phase gate
The lab is working on the "cubic phase gate," which is difficult to realize among the basic gates required for optical quantum computation. Experiments are proceeding with an indirect method that combines a special ancillary state with quantum teleportation.
*Illustrative imageA device for storing and retrieving quantum states
The lab studies a device that stores special quantum states, which can only be generated probabilistically, and releases them at any desired time. In addition to a quantum memory built by connecting resonators, the lab is also developing, through joint research, a detector that can distinguish the number of photons.
*Illustrative imageIntegrating optical quantum circuits with waveguides
Together with NTT, the lab works to make optical quantum computers smaller and faster. It integrates the part that generates quantum entanglement onto an optical chip, and generates broadband squeezed light at telecommunication wavelengths.
MembersFaculty
The members of the Furusawa Lab consist of faculty members, doctoral and master's students, joint researchers, and secretaries.As of 2026
- ProfessorAkira FurusawaPublications ↗
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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: “Femtosecond Laser and Pulse Compressor - Optics Lab - INRIM” Giorgio Brida from Torino, Italy / CC BY 2.0 (cropped)
- Large-scale quantum computation with time-domain multiplexing: “Infrared (1064 nm) Laser Beams and Pre-Mode Cleaner” Tobin from Rochester, NY, USA / CC BY-SA 2.0 (cropped)
- Development of the cubic phase gate: “Fig-BHD-E-RS” RSchnabel / CC BY-SA 4.0 (cropped)
- A device for storing and retrieving quantum states: “Ultrafast Single-Photon Detector ( )” National Institute of Standards and Technology / Public domain (cropped)
- Integrating optical quantum circuits with waveguides: “IR Optical Parametric Oscillator” Kkmurray / CC BY 3.0 (cropped)
- Related lab (遠藤研究室): “Infrared (1064 nm) Laser Beams and Pre-Mode Cleaner” Tobin from Rochester, NY, USA / CC BY-SA 2.0 (cropped)
- Related lab (香取・牛島研究室): “Sr-lattice-optical-atomi-clock opt” The Ye group and Brad Baxley, JILA / Public domain (cropped)
- Related lab (森竹研究室): “SRNL Developing Photonic Crystals ( )” Savannah River Site / Public domain (cropped)
- Related lab (佐藤研究室): “Boerdijk-Coxeter helices” Carsten Steger / CC BY-SA 4.0 (cropped)
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