Storing quantum information for 30 seconds in a nanoelectronic device

Muhonen, Juha T., Dehollain, Juan P., Laucht, Arne, Hudson, Fay E., Kalra, Rachpon, Sekiguchi, Takeharu, Itoh, Kohei M., Jamieson, David N., McCallum, Jeffrey C., Dzurak, Andrew S. and Morello, Andrea (2014) Storing quantum information for 30 seconds in a nanoelectronic device. Nature Nanotechnology, 9 12: 986-991. doi:10.1038/nnano.2014.211

Author Muhonen, Juha T.
Dehollain, Juan P.
Laucht, Arne
Hudson, Fay E.
Kalra, Rachpon
Sekiguchi, Takeharu
Itoh, Kohei M.
Jamieson, David N.
McCallum, Jeffrey C.
Dzurak, Andrew S.
Morello, Andrea
Title Storing quantum information for 30 seconds in a nanoelectronic device
Journal name Nature Nanotechnology   Check publisher's open access policy
ISSN 1748-3395
Publication date 2014-01-01
Sub-type Article (original research)
DOI 10.1038/nnano.2014.211
Open Access Status Not yet assessed
Volume 9
Issue 12
Start page 986
End page 991
Total pages 6
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Language eng
Formatted abstract
The spin of an electron or a nucleus in a semiconductor naturally implements the unit of quantum information—the qubit. In addition, because semiconductors are currently used in the electronics industry, developing qubits in semiconductors would be a promising route to realize scalable quantum information devices. The solid-state environment, however, may provide deleterious interactions between the qubit and the nuclear spins of surrounding atoms, or charge and spin fluctuations arising from defects in oxides and interfaces. For materials such as silicon, enrichment of the spin-zero 28Si isotope drastically reduces spin-bath decoherence. Experiments on bulk spin ensembles in 28Si crystals have indeed demonstrated extraordinary coherence times. However, it remained unclear whether these would persist at the single-spin level, in gated nanostructures near amorphous interfaces. Here, we present the coherent operation of individual 31P electron and nuclear spin qubits in a top-gated nanostructure, fabricated on an isotopically engineered 28Si substrate. The 31P nuclear spin sets the new benchmark coherence time (>30 s with Carr–Purcell–Meiboom–Gill (CPMG) sequence) of any single qubit in the solid state and reaches >99.99% control fidelity. The electron spin CPMG coherence time exceeds 0.5 s, and detailed noise spectroscopy indicates that—contrary to widespread belief—it is not limited by the proximity to an interface. Instead, decoherence is probably dominated by thermal and magnetic noise external to the device, and is thus amenable to further improvement.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
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Created: Mon, 08 May 2017, 16:10:27 EST by Rachpon Kalra on behalf of School of Mathematics & Physics