tarucha

Seigo Tarucha

Team Leader, Semiconductor Quantum Information Device Research Team 

Outline

We study physics and technology of solid-state information processing based on a concept of quantum state control. We aim to demonstrate ability of spin-based quantum computing with semiconductor quantum dots, develop control methods of quantum coherence and entanglement and innovative quantum information devices, and in addition explore control methods of topological particles providing new concepts of quantum information.

Research Themes

・Research of high-fidelity quantum operations whose fidelities exceed the threshould for fault tolerant quantum computation.
・Research of scalable medium-scale quantum computing circuits.
・About physics and technology of topological quantum computation

Representative Research Results

・K. Takeda, A. Noiri, T. Nakajima, J. Yoneda, T. Kobayashi, and S. Tarucha, “Quantum tomography
of an entangled three-qubit state in silicon”, Nat. Nanotechnol. (2021).

・J. Yoneda, K. Takeda, A. Noiri, T. Nakajima, S. Li, J. Kamioka, T. Kodera, and S. Tarucha,
“Quantum non-demolition readout of an electron spin in silicon”, Nature Commun. 11,
1144-1150 (2020).

・T. Nakajima, A. Noiri, J.Yoneda, M.R. Delbecq, P. Stano, T. Otsuka, K. Takeda, S. Amaha, G. Allison,
K. Kawasaki, A. Ludwig, A.D. Wieck, D. Loss, and S. Tarucha “Quantum non-demolition
measurement of an electron spin qubit”, Nature Nanotechnol. 14, 555-560 (2019).

・K. Ueda, S. Matsuo, H. Kamata, S. Baba, Y. Sato, Y. Takeshige, K. Li, S. Jeppesen, L. Samuelson,
Q Xu, and S. Tarucha, “Dominant nonlocal superconducting proximity effect due to electron-
electron interaction in a ballistic double nanowire”, Science Adv. 5, eaaw2194, (2019).

・Press release
”Quantum non-demolition measurement of semiconductor qubits successful” 2019.4.16

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Fig.1 Photo of a Si/SiGe triple quantum dot with a micro-magnet used for generating three spin entanglement.




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Fig.2 Quantum non-demolition measurement using electron spin qubits. One of the entangled qubits is measured to non-demolitionally readout the other qubit.

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