Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session L08: Superconducting Qubits: Materials, Fabrication and Coherence II
8:00 AM–10:48 AM,
Wednesday, March 4, 2020
Room: 104
Sponsoring
Unit:
DQI
Abstract: L08.00006 : Synchrotron X-ray studies of superconducting qubit materials*
Presenter:
Ignace Jarrige
(National Synchrotron Light Source II, Brookhaven National Laboratory)
Authors:
Ignace Jarrige
(National Synchrotron Light Source II, Brookhaven National Laboratory)
Anjali Premkumar
(Department of Electrical Engineering, Princeton University)
Conan R Weiland
(Materials Measurement Science Division, National Institute of Standards and Technology)
Jack Berthold
(Department of Electrical Engineering, Princeton University)
Alexander Place
(Department of Electrical Engineering, Princeton University)
Ira Waluyo
(National Synchrotron Light Source II, Brookhaven National Laboratory)
Adrian Hunt
(National Synchrotron Light Source II, Brookhaven National Laboratory)
Andrew M. Kiss
(National Synchrotron Light Source II, Brookhaven National Laboratory)
Yong Chu
(National Synchrotron Light Source II, Brookhaven National Laboratory)
Valentina Bisogni
(National Synchrotron Light Source II, Brookhaven National Laboratory)
Jonathan Pelliciari
(National Synchrotron Light Source II, Brookhaven National Laboratory)
Abdul K Rumaiz
(National Synchrotron Light Source II, Brookhaven National Laboratory)
Mike Miller
(Angstrom Engineering Inc.)
Paula Russo
(Angstrom Engineering Inc.)
David I Schuster
(Department of Physics and the James Franck Institute, University of Chicago)
Andrew Houck
(Department of Electrical Engineering, Princeton University)
Here, we report on the combined use of synchrotron X-ray scattering and spectroscopic tools to probe the surface electronic and bulk structural properties of Nb thin films deposited on sapphire, which emulate qubit capacitor pads. The thin films were deposited using four different techniques yielding varying film qualities and densities. Material properties, including crystalline grain sizes and surface oxide layer thicknesses and compositions, will be discussed in light of the coherence times obtained for transmon qubits using Nb capacitor pads deposited with the same four techniques. We will discuss possible scenarios for the correlations between the material properties and the qubit performance.
*AP, BJ, & AP thank ARO, NSF GRF, Humboldt Foundation, & NDSEG.
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