Improving qubit coherence using closed-loop feedback
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Improving qubit coherence using closed-loop feedback. / Vepsäläinen, Antti; Winik, Roni; Karamlou, Amir H.; Braumüller, Jochen; Paolo, Agustin Di; Sung, Youngkyu; Kannan, Bharath; Kjaergaard, Morten; Kim, David K.; Melville, Alexander J.; Niedzielski, Bethany M.; Yoder, Jonilyn L.; Gustavsson, Simon; Oliver, William D.
In: Nature Communications, Vol. 13, 1932, 2022.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Improving qubit coherence using closed-loop feedback
AU - Vepsäläinen, Antti
AU - Winik, Roni
AU - Karamlou, Amir H.
AU - Braumüller, Jochen
AU - Paolo, Agustin Di
AU - Sung, Youngkyu
AU - Kannan, Bharath
AU - Kjaergaard, Morten
AU - Kim, David K.
AU - Melville, Alexander J.
AU - Niedzielski, Bethany M.
AU - Yoder, Jonilyn L.
AU - Gustavsson, Simon
AU - Oliver, William D.
N1 - Publisher Copyright: © 2022, The Author(s).
PY - 2022
Y1 - 2022
N2 - 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.
AB - 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.
U2 - 10.1038/s41467-022-29287-4
DO - 10.1038/s41467-022-29287-4
M3 - Journal article
C2 - 35410327
AN - SCOPUS:85128071905
VL - 13
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
M1 - 1932
ER -
ID: 342679552