Fast spin exchange across a multielectron mediator

Malinowski, Filip K.; Martins, Frederico; Smith, Thomas B.; Bartlett, Stephen D.; Doherty, Andrew C.; Nissen, Peter D.; Fallahi, Saeed; Gardner, Geoffrey C.; Manfra, Michael J.; Marcus, Charles M.; Kuemmeth, Ferdinand

doi:10.1038/s41467-019-09194-x

Title: Fast spin exchange across a multielectron mediator

Journal Article · Wed Mar 13 00:00:00 EDT 2019 · Nature Communications

DOI:https://doi.org/10.1038/s41467-019-09194-x· OSTI ID:1610881

Malinowski, Filip K. ^[1];

^[1];

^[2]; Bartlett, Stephen D. ^[2]; Doherty, Andrew C. ^[2];

^[1]; Fallahi, Saeed ^[3]; Gardner, Geoffrey C. ^[3];

^[3];

^[1]; Kuemmeth, Ferdinand ^[1]

Univ. of Copenhagen (Denmark)
Univ. of Sydney, NSW (Australia)
Purdue Univ., West Lafayette, IN (United States)

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.

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Research Organization:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0006671

OSTI ID:: 1610881

Journal Information:: Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 31 works

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