K
Kohei M. Itoh
Researcher at Keio University
Publications - 414
Citations - 15409
Kohei M. Itoh is an academic researcher from Keio University. The author has contributed to research in topics: Qubit & Silicon. The author has an hindex of 52, co-authored 403 publications receiving 12923 citations. Previous affiliations of Kohei M. Itoh include Lawrence Berkeley National Laboratory & Kyushu University.
Papers
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Journal ArticleDOI
A two-qubit logic gate in silicon
Menno Veldhorst,C. H. Yang,J. C. C. Hwang,W. Huang,Juan Pablo Dehollain,Juha T. Muhonen,Stephanie Simmons,Arne Laucht,Fay E. Hudson,Kohei M. Itoh,Andrea Morello,Andrew S. Dzurak +11 more
TL;DR: A two-qubit logic gate is presented, which uses single spins in isotopically enriched silicon and is realized by performing single- and two- qubits operations in a quantum dot system using the exchange interaction, as envisaged in the Loss–DiVincenzo proposal.
Journal ArticleDOI
An addressable quantum dot qubit with fault-tolerant control-fidelity
Menno Veldhorst,J. C. C. Hwang,C. H. Yang,A. W. Leenstra,B. de Ronde,Juan Pablo Dehollain,Juha T. Muhonen,Fay E. Hudson,Kohei M. Itoh,Andrea Morello,Andrew S. Dzurak +10 more
TL;DR: This work combines the best aspects of both spin qubit schemes and demonstrate a gate-addressable quantum dot qubit in isotopically engineered silicon with a control fidelity of 99.6%, consistent with that required for fault-tolerant quantum computing.
Journal ArticleDOI
A quantum-dot spin qubit with coherence limited by charge noise and fidelity higher than 99.9.
Jun Yoneda,Kenta Takeda,Tomohiro Otsuka,Tomohiro Otsuka,Takashi Nakajima,Matthieu R. Delbecq,Giles Allison,Takumu Honda,Tetsuo Kodera,Shunri Oda,Yusuke Hoshi,Noritaka Usami,Kohei M. Itoh,Seigo Tarucha +13 more
TL;DR: It is revealed that the free-evolution dephasing is caused by charge noise—rather than conventional magnetic noise—as highlighted by a 1/f spectrum extended over seven decades of frequency, offering a promising route to large-scale spin-qubit systems with fault-tolerant controllability.
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Electron spin coherence exceeding seconds in high-purity silicon
Alexei M. Tyryshkin,Shinichi Tojo,John J. L. Morton,Helge Riemann,Nikolai V. Abrosimov,Peter Becker,Hans Joachim Pohl,Thomas Schenkel,Mike L. W. Thewalt,Kohei M. Itoh,Stephen Aplin Lyon +10 more
TL;DR: These coherence lifetimes are without peer in the solid state and comparable to high-vacuum qubits, making electron spins of donors in silicon ideal components of quantum computers, or quantum memories for systems such as superconducting qubits.
Journal ArticleDOI
Storing quantum information for 30 seconds in a nanoelectronic device
Juha T. Muhonen,Juan Pablo Dehollain,Arne Laucht,Fay E. Hudson,Rachpon Kalra,T. Sekiguchi,Kohei M. Itoh,David N. Jamieson,Jeffrey C. McCallum,Andrew S. Dzurak,Andrea Morello +10 more
TL;DR: The (31)P nuclear spin sets the new benchmark coherence time of any single qubit in the solid state and reaches >99.99% control fidelity, and detailed noise spectroscopy indicates that--contrary to widespread belief--it is not limited by the proximity to an interface.