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 and A. S. Dzurak ()
Additional contact information
J. Yoneda: The University of New South Wales
W. Huang: The University of New South Wales
M. Feng: The University of New South Wales
C. H. Yang: The University of New South Wales
K. W. Chan: The University of New South Wales
T. Tanttu: The University of New South Wales
W. Gilbert: The University of New South Wales
R. C. C. Leon: The University of New South Wales
F. E. Hudson: The University of New South Wales
K. M. Itoh: Keio University
A. Morello: The University of New South Wales
S. D. Bartlett: University of Sydney
A. Laucht: The University of New South Wales
A. Saraiva: The University of New South Wales
A. S. Dzurak: The University of New South Wales

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: 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.

Date: 2021
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Citations: View citations in EconPapers (5)

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DOI: 10.1038/s41467-021-24371-7

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