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Superconducting Qubits Open Quantum Systems Decoherence

Bulk and surface loss in superconducting transmon qubits

arXiv
Authors: Oliver Dial, Douglas T. McClure, Stefano Poletto, Jay M. Gambetta, David W. Abraham, Jerry M. Chow, Matthias Steffen

Year

2015

Paper ID

27274

Status

Preprint

Abstract Read

~2 min

Abstract Words

97

Citations

N/A

Abstract

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.

Why This Paper Matters

  • This paper contributes to the Superconducting Qubits research area in the Quantum Articles archive.
  • It adds a 2015 reference point for readers tracking recent quantum research.
  • Decoherence of superconducting transmon qubits is purported to be consistent with surface loss from two-level systems on the substrate surface.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1509.03859 [2] arXiv https://arxiv.org/abs/1509.03859 [3] Publisher https://arxiv.org/abs/1509.03859

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