Improving qubit coherence using closed-loop feedback
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Superconducting 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.
Originalsprog | Engelsk |
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Artikelnummer | 1932 |
Tidsskrift | Nature Communications |
Vol/bind | 13 |
ISSN | 2041-1723 |
DOI | |
Status | Udgivet - 2022 |
Bibliografisk note
Funding Information:
This work was supported in part by the U.S. Army Research Office (ARO) Grant W911NF-18-1-0411; by the ARO Multi-University Research Initiative W911NF-18-1-0218; and by the Assistant Secretary of Defense for Research and Engineering via MIT Lincoln Laboratory under Air Force Contract no. FA8721-05-C-0002. A.K. acknowledges support from the NSF Graduate Research Fellowship program. The authors thank Andy Ding for their comments on the manuscript.
Publisher Copyright:
© 2022, The Author(s).
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