A crossbar network for silicon quantum dot qubits

Li, R; Petit, L; Franke, DP; Dehollain, JP; Helsen, J; Steudtner, M; Thomas, NK; Yoscovits, ZR; Singh, KJ; Wehner, S; Vandersypen, LMK; Clarke, JS; Veldhorst, M

A crossbar network for silicon quantum dot qubits

Li, R Petit, L Franke, DP Dehollain, JP

Helsen, J Steudtner, M Thomas, NK Yoscovits, ZR Singh, KJ Wehner, S Vandersypen, LMK Clarke, JS Veldhorst, M

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Publication Type:: Journal Article
Citation:: Science Advances, 2018, 4 (7)
Issue Date:: 2018-07-06

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Field	Value	Language
dc.contributor.author	Li, R	en_US
dc.contributor.author	Petit, L	en_US
dc.contributor.author	Franke, DP	en_US
dc.contributor.author	Dehollain, JP https://orcid.org/0000-0002-0425-4345	en_US
dc.contributor.author	Helsen, J	en_US
dc.contributor.author	Steudtner, M	en_US
dc.contributor.author	Thomas, NK	en_US
dc.contributor.author	Yoscovits, ZR	en_US
dc.contributor.author	Singh, KJ	en_US
dc.contributor.author	Wehner, S	en_US
dc.contributor.author	Vandersypen, LMK	en_US
dc.contributor.author	Clarke, JS	en_US
dc.contributor.author	Veldhorst, M	en_US
dc.date.available	2018-05-29	en_US
dc.date.issued	2018-07-06	en_US
dc.identifier.citation	Science Advances, 2018, 4 (7)	en_US
dc.identifier.uri	http://hdl.handle.net/10453/131528
dc.description.abstract	Copyright © 2018 The Authors. The spin states of single electrons in gate-defined quantum dots satisfy crucial requirements for a practical quantum computer. These include extremely long coherence times, high-fidelity quantum operation, and the ability to shuttle electrons as a mechanism for on-chip flying qubits. To increase the number of qubits to the thousands or millions of qubits needed for practical quantum information, we present an architecture based on shared control and a scalable number of lines. Crucially, the control lines define the qubit grid, such that no local components are required. Our design enables qubit coupling beyond nearest neighbors, providing prospects for nonplanar quantum error correction protocols. Fabrication is based on a three-layer design to define qubit and tunnel barrier gates. We show that a double stripline on top of the structure can drive high-fidelity single-qubit rotations. Self-aligned inhomogeneous magnetic fields induced by direct currents through superconducting gates enable qubit addressability and readout. Qubit coupling is based on the exchange interaction, and we show that parallel two-qubit gates can be performed at the detuning-noise insensitive point. While the architecture requires a high level of uniformity in the materials and critical dimensions to enable shared control, it stands out for its simplicity and provides prospects for large-scale quantum computation in the near future.	en_US
dc.relation.ispartof	Science Advances	en_US
dc.relation.isbasedon	10.1126/sciadv.aar3960	en_US
dc.title	A crossbar network for silicon quantum dot qubits	en_US
dc.type	Journal Article
utslib.citation.volume	7	en_US
utslib.citation.volume	4	en_US
utslib.for	0206 Quantum Physics	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - QSI - Centre for Quantum Software and Information
utslib.copyright.status	open_access
pubs.issue	7	en_US
pubs.publication-status	Published	en_US
pubs.volume	4	en_US

Abstract:

Copyright © 2018 The Authors. The spin states of single electrons in gate-defined quantum dots satisfy crucial requirements for a practical quantum computer. These include extremely long coherence times, high-fidelity quantum operation, and the ability to shuttle electrons as a mechanism for on-chip flying qubits. To increase the number of qubits to the thousands or millions of qubits needed for practical quantum information, we present an architecture based on shared control and a scalable number of lines. Crucially, the control lines define the qubit grid, such that no local components are required. Our design enables qubit coupling beyond nearest neighbors, providing prospects for nonplanar quantum error correction protocols. Fabrication is based on a three-layer design to define qubit and tunnel barrier gates. We show that a double stripline on top of the structure can drive high-fidelity single-qubit rotations. Self-aligned inhomogeneous magnetic fields induced by direct currents through superconducting gates enable qubit addressability and readout. Qubit coupling is based on the exchange interaction, and we show that parallel two-qubit gates can be performed at the detuning-noise insensitive point. While the architecture requires a high level of uniformity in the materials and critical dimensions to enable shared control, it stands out for its simplicity and provides prospects for large-scale quantum computation in the near future.

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http://hdl.handle.net/10453/131528