Bulk and surface loss in superconducting transmon qubits

Decoherence of superconducting transmon qubits is purported to be consistent with surface loss from two-level systems on the substrate surface. Here, we present a study of surface loss in transmon devices, explicitly designed to have varying sensitivities to different surface loss contributors. Our...

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Bibliographic Details
Published in:Superconductor science & technology 2016-04, Vol.29 (4), p.44001-44004
Main Authors: Dial, Oliver, McClure, Douglas T, Poletto, Stefano, Keefe, G A, Rothwell, Mary Beth, Gambetta, Jay M, Abraham, David W, Chow, Jerry M, Steffen, Matthias
Format: Article
Language:English
Subjects:
Devices
loss tangent
Qubits (quantum computing)
Sapphire
Substrates
Superconductivity
Superconductors
surface loss
transmon
Wafers
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Summary:Decoherence of superconducting transmon qubits is purported to be consistent with surface loss from two-level systems on the substrate surface. Here, we present a study of surface loss in transmon devices, explicitly designed to have varying sensitivities to different surface loss contributors. Our experiments also encompass two particular different sapphire substrates, which reveal the onset of a yet unknown additional loss mechanism outside of surface loss for one of the substrates. Tests across different wafers and devices demonstrate substantial variation, and we emphasize the importance of testing large numbers of devices for disentangling different sources of decoherence.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/29/4/044001