Coherent spin qubit transport in silicon

J. Yoneda; W. Huang; M. Feng; C. H. Yang; K. W. Chan; T. Tanttu; W. Gilbert; R. C.C. Leon; F. E. Hudson; K. M. Itoh; A. Morello; S. D. Bartlett; A. Laucht; A. Saraiva; A. S. Dzurak

doi:10.1038/s41467-021-24371-7

Coherent spin qubit transport in silicon

J. Yoneda, W. Huang, M. Feng, C. H. Yang, K. W. Chan, T. Tanttu, W. Gilbert, R. C.C. Leon, F. E. Hudson, K. M. Itoh, A. Morello, S. D. Bartlett, A. Laucht, A. Saraiva, A. S. Dzurak

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Abstract

A fault-tolerant quantum processor may be configured using stationary qubits interacting only with their nearest neighbours, but at the cost of significant overheads in physical qubits per logical qubit. Such overheads could be reduced by coherently transporting qubits across the chip, allowing connectivity beyond immediate neighbours. Here we demonstrate high-fidelity coherent transport of an electron spin qubit between quantum dots in isotopically-enriched silicon. We observe qubit precession in the inter-site tunnelling regime and assess the impact of qubit transport using Ramsey interferometry and quantum state tomography techniques. We report a polarization transfer fidelity of 99.97% and an average coherent transfer fidelity of 99.4%. Our results provide key elements for high-fidelity, on-chip quantum information distribution, as long envisaged, reinforcing the scaling prospects of silicon-based spin qubits.

Original language	English
Article number	4114
Journal	Nature communications
Volume	12
Issue number	1
DOIs	https://doi.org/10.1038/s41467-021-24371-7
Publication status	Published - 2021 Dec 1

ASJC Scopus subject areas

Chemistry(all)
Biochemistry, Genetics and Molecular Biology(all)
General
Physics and Astronomy(all)

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10.1038/s41467-021-24371-7

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title = "Coherent spin qubit transport in silicon",

abstract = "A fault-tolerant quantum processor may be configured using stationary qubits interacting only with their nearest neighbours, but at the cost of significant overheads in physical qubits per logical qubit. Such overheads could be reduced by coherently transporting qubits across the chip, allowing connectivity beyond immediate neighbours. Here we demonstrate high-fidelity coherent transport of an electron spin qubit between quantum dots in isotopically-enriched silicon. We observe qubit precession in the inter-site tunnelling regime and assess the impact of qubit transport using Ramsey interferometry and quantum state tomography techniques. We report a polarization transfer fidelity of 99.97% and an average coherent transfer fidelity of 99.4%. Our results provide key elements for high-fidelity, on-chip quantum information distribution, as long envisaged, reinforcing the scaling prospects of silicon-based spin qubits.",

author = "J. Yoneda and W. Huang and M. Feng and Yang, {C. H.} and Chan, {K. W.} and T. Tanttu and W. Gilbert and Leon, {R. C.C.} and Hudson, {F. E.} and Itoh, {K. M.} and A. Morello and Bartlett, {S. D.} and A. Laucht and A. Saraiva and Dzurak, {A. S.}",

note = "Funding Information: We thank C. Escott for discussions and assistance with the work. We acknowledge support from the Australian Research Council (FL190100167 and CE170100012), the US Army Research Office (W911NF-17-1-0198), and the NSW Node of the Australian National Fabrication Facility. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Office or the US Government. J.Y acknowledges support from JSPS KAKENHI (No. JP21K14485). K.M.I. acknowledges support from a Grant-in-Aid for Scientific Research by MEXT. Publisher Copyright: {\textcopyright} 2021, The Author(s).",

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AU - Chan, K. W.

AU - Tanttu, T.

AU - Gilbert, W.

AU - Leon, R. C.C.

AU - Hudson, F. E.

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AU - Morello, A.

AU - Bartlett, S. D.

AU - Laucht, A.

AU - Saraiva, A.

AU - Dzurak, A. S.

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Coherent spin qubit transport in silicon

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