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Quantum Device Engineering Lab
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A lab that manipulates the spin of a single electron, aiming for a semiconductor quantum computer.
AboutAbout the lab
From a single electron to a quantum computer.
The Quantum Device Engineering Lab studies the ways electric current flows that are unique to quantum mechanics in tiny semiconductor structures such as quantum dots.
The lab fabricates semiconductor quantum devices only nanometers in size by itself, and carries out experiments end to end, up to measuring the flow of current at cryogenic temperatures close to absolute zero.
The spin of a single electron in a quantum dot is a promising candidate for a qubit of a quantum computer.
Through techniques to manipulate and measure spin and to arrange many quantum dots, the lab aims to realize a semiconductor quantum computer.
Key terms
- Quantum dot
- A structure in which electrons are confined in a semiconductor box nanometers in size. A single electron can be added or removed.
- Spin
- A property of electrons like that of a tiny magnet. The up and down states can be used as information.
- Qubit
- The unit that represents information in a quantum computer. It can take a superposition of 0 and 1.
- Superconducting proximity effect
- A phenomenon in which superconducting properties seep into another material that is in contact with a superconductor.
NewsLab news
Associate Professor Kiyama received the 7th Materials and Devices Joint Research Award
Paper published in npj Quantum Information
ResearchResearch themes
The lab studies quantum transport phenomena in semiconductor quantum structures end to end, from device fabrication to measurement at cryogenic temperatures. It aims to realize a semiconductor quantum computer that uses the electron spins in quantum dots.
*Illustrative imageArranging quantum dots in two dimensions to increase the number of qubits
In quantum dots, the motion of a single electron can be detected in situ, and the orientation of a single electron's spin can be freely controlled. A practical semiconductor quantum computer requires many integrated qubits, and for that, arranging quantum dots in two dimensions is important. The lab builds two-dimensional quantum dot arrays and studies methods to manipulate and measure single-electron spins even in the presence of impurities and fabrication variations.
*Illustrative imageConnecting semiconductors and superconductors
At junctions between semiconductors and superconductors, the superconducting proximity effect produces a wide variety of phenomena, such as Cooper pair splitting and the emergence of Majorana particles. Using junctions between two-dimensional electron systems in semiconductors and superconductors, the lab builds hybrid quantum devices that can be integrated.
MembersFaculty
The members of the Quantum Device Engineering Lab are faculty members, researchers, administrative assistants, and master's and undergraduate students.As of 2026
- Associate ProfessorHaruki Kiyama
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: “Gold Cryostat 8K-4” Onri Jay Benally / CC BY-SA 2.0 (cropped)
- Arranging quantum dots in two dimensions to increase the number of qubits: “D-L- Glucose farbig V1” Vectorization: Alhadis / Public domain (cropped)
- Connecting semiconductors and superconductors: “Meissner effect p1390048” Mai-Linh Doan / CC BY-SA 3.0 (cropped)
- Related lab (集積磁気デバイス研究室): “2019 Rozebrane dyski twarde” Jacek Halicki / CC BY-SA 4.0 (cropped)
- Related lab (原子層プロセス科学研究室): “Filling with hazardous reagents for the atomic layer growth process” R Ashurov / CC BY 4.0 (cropped)
- Related lab (電子材料研究室): “Photonics chip 1” Tal b2 / CC BY-SA 4.0 (cropped)
- Related lab (超伝導理工学研究室): “Superconducting Magnets J-PARC” Patrick Dep / CC BY-SA 2.0 (cropped)
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