Fast spin exchange across a multielectron mediator

Filip K. Malinowski, Frederico Martins, Thomas B. Smith, Stephen D. Bartlett, Andrew C. Doherty, Peter D. Nissen, Saeed Fallahi, Geoffrey C. Gardner, Michael J. Manfra, Charles M. Marcus and Ferdinand Kuemmeth ()
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Filip K. Malinowski: University of Copenhagen
Frederico Martins: University of Copenhagen
Thomas B. Smith: The University of Sydney
Stephen D. Bartlett: The University of Sydney
Andrew C. Doherty: The University of Sydney
Peter D. Nissen: University of Copenhagen
Saeed Fallahi: Purdue University
Geoffrey C. Gardner: Purdue University
Michael J. Manfra: Purdue University
Charles M. Marcus: University of Copenhagen
Ferdinand Kuemmeth: University of Copenhagen

Nature Communications, 2019, vol. 10, issue 1, 1-6

Abstract: Abstract Scalable quantum processors require tunable two-qubit gates that are fast, coherent and long-range. The Heisenberg exchange interaction offers fast and coherent couplings for spin qubits, but is intrinsically short-ranged. Here, we demonstrate that its range can be increased by employing a multielectron quantum dot as a mediator, while preserving speed and coherence of the resulting spin-spin coupling. We do this by placing a large quantum dot with 50–100 electrons between a pair of two-electron double quantum dots that can be operated and measured simultaneously. Two-spin correlations identify coherent spin-exchange processes across the multielectron quantum dot. We further show that different physical regimes of the mediated exchange interaction allow a reduced susceptibility to charge noise at sweet spots, as well as positive and negative coupling strengths up to several gigahertz. These properties make multielectron dots attractive as scalable, voltage-controlled coherent coupling elements.

Date: 2019
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DOI: 10.1038/s41467-019-09194-x

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