Improving qubit coherence using closed-loop feedback

Author:

Vepsäläinen AnttiORCID,Winik RoniORCID,Karamlou Amir H.ORCID,Braumüller JochenORCID,Paolo Agustin DiORCID,Sung YoungkyuORCID,Kannan BharathORCID,Kjaergaard Morten,Kim David K.,Melville Alexander J.,Niedzielski Bethany M.ORCID,Yoder Jonilyn L.,Gustavsson SimonORCID,Oliver William D.

Abstract

AbstractSuperconducting qubits are a promising platform for building a larger-scale quantum processor capable of solving otherwise intractable problems. In order for the processor to reach practical viability, the gate errors need to be further suppressed and remain stable for extended periods of time. With recent advances in qubit control, both single- and two-qubit gate fidelities are now in many cases limited by the coherence times of the qubits. Here we experimentally employ closed-loop feedback to stabilize the frequency fluctuations of a superconducting transmon qubit, thereby increasing its coherence time by 26% and reducing the single-qubit error rate from (8.5 ± 2.1) × 10−4 to (5.9 ± 0.7) × 10−4. Importantly, the resulting high-fidelity operation remains effective even away from the qubit flux-noise insensitive point, significantly increasing the frequency bandwidth over which the qubit can be operated with high fidelity. This approach is helpful in large qubit grids, where frequency crowding and parasitic interactions between the qubits limit their performance.

Funder

United States Department of Defense | United States Army | U.S. Army Research, Development and Engineering Command | Army Research Office

United States Department of Defense | U.S. Air Force

National Science Foundation

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary

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