Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session Z46: Broadband Parametric Amplifiers and Circulators
11:30 AM–2:18 PM,
Friday, March 8, 2024
Room: 200AB
Sponsoring
Unit:
DQI
Chair: Debopam Datta, VTT technical research centre of Finland
Abstract: Z46.00011 : Assessing the Impact of Fabrication Variations on Josephson Travelling Wave Parametric Amplifiers
1:54 PM–2:06 PM
Presenter:
Andres E Lombo
(Massachusetts Institute of Technology)
Authors:
Andres E Lombo
(Massachusetts Institute of Technology)
Kaidong Peng
(Massachusetts Institute of Technology MI)
Eric Bui
(Massachusetts Institute of Technology)
Aranya Goswami
(Massachusetts Institute of Technology)
William D Oliver
(Massachusetts Institute of Technology MI)
Kevin P O'Brien
(Massachusetts Institute of Technology MI)
In this work, we analyze the superconducting circuit performance in the presence of fabrication variations to predict the process constraints needed to enable the high reproducibility of micro- and nanostructured components in the JTWPA fabricated on an all-Aluminium qubit-compatible process. We show systematic improvements in device performance from the refinement of Josephson junction fabrication treatments for yield and uniformity. We compare measurements on fabricated devices and correlate the effects of mismatched cell impedance and signal reflections between cells to the parameter spread in fabrication runs. Subsequently, we model cell-to-cell variations of circuit parameters and evaluate the impact of non-uniformity on the gain, quantum efficiency, return loss, and insertion loss. Finally, we combine experimental data and simulations to obtain gain scaling from the relative standard deviation of process parameters.
*This work was funded in part by the AWS Center for Quantum Computing
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