Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session K48: Strongly Driven Superconducting Systems
3:00 PM–5:48 PM,
Tuesday, March 5, 2024
Room: 200E
Sponsoring
Unit:
DQI
Chair: Antoine Brillant, University of Chicago
Abstract: K48.00009 : High fidelity gates in a transmon using bath engineering for passive leakage reset*
4:36 PM–4:48 PM
Presenter:
Alexander McDonald
(Université de Sherbrooke)
Authors:
Alexander McDonald
(Université de Sherbrooke)
Ted Thorbeck
(IBM Quantum)
Olivia Lanes
(IBM)
Baptiste Royer
(Université de Sherbrooke)
Luke C Govia
(IBM Almaden Research Center)
Alexandre Blais
(Universite de Sherbrooke)
Although several proposals have been introduced to mitigate the effect of leakage, here we theoretically explore and experimentally demonstrate a passive filtering approach to leakage in a standard transmon. By coupling the qubit to a structured environment, we engineer the decay rate of the f-state to be large and e-state to be small; any erroneous f-state population (or higher leakage population) is quickly brought back to the qubit subspace, whereas the e-state remains long-lived. Considering only energetically relevant levels, we simulate the full coupled transmon-filter system and demonstrate that it is possible to obtain both a large f-state decay rate and a high averaged gate fidelity. Our work demonstrates the possibility of passive leakage reduction as a useful tool for fault-tolerant quantum computation.
*This work was undertaken thanks in part to funding from NSERC, Canada First Research Excellence Fund, and the Ministère de l'Économie et de l'Innovation du Québec.
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