Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session B73: Superconducting Qubits: Design and device tools
11:30 AM–2:30 PM,
Monday, March 6, 2023
Room: Room 405
Sponsoring
Unit:
DQI
Chair: Alexander McDonald, Université de Sherbrooke
Abstract: B73.00015 : Design of a current-biased tunable coupler integrated with superconducting 3D-cavities*
2:18 PM–2:30 PM
Presenter:
Eva Gurra
(JILA)
Authors:
Eva Gurra
(JILA)
Ziyi Zhao
(JILA)
Konrad Lehnert
(JILA)
In this talk, we present the design of a current-controlled superconducting coupling element based on an inductive Wheatstone bridge. The inductors on the arms of the bridge are arrays of gradiometric rf SQUIDs, which are insensitive to uniform flux changes in the environment to first order. The bridge is controlled by a uniform trapped current in the outer loop and imbalanced by a gradiometric current. Numerical simulations of the bridge coupled to two superconducting 3D cavities predict that tunable coupling on the order of megahertz, with high on/off contrast, is achievable between the cavities.
*This work is supported by the U.S. Air Force Office of Scientific Research Multidisciplinary Research Program of the University Research Initiative (AFOSR MURI) under Grant No. FA9550-15-1-0015 and the National Science Foundation under Grant No. 1734006.
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