Reducing the error rate of a superconducting logical qubit using analog readout information

Hany Ali; Jorge Marques; Ophelia Crawford; Joonas Majaniemi; Marc Serra-Peralta; David Byfield; Boris Varbanov; Barbara M. Terhal; Leonardo Dicarlo; Earl T. Campbell

doi:10.1103/PhysRevApplied.22.044031

Reducing the error rate of a superconducting logical qubit using analog readout information

Hany Ali, Jorge Marques, Ophelia Crawford, Joonas Majaniemi, Marc Serra-Peralta, David Byfield, Boris Varbanov, Barbara M. Terhal, Leonardo Dicarlo, Earl T. Campbell^*

^*Corresponding author for this work

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Abstract

Quantum error correction enables the preservation of logical qubits with a lower logical error rate than the physical error rate, with performance depending on the decoding method. Traditional decoding approaches rely on the binarization ("hardening") of readout data, thereby ignoring valuable information embedded in the analog ("soft") readout signal. We present experimental results showcasing the advantages of incorporating soft information into the decoding process of a distance-3 (d=3) bit-flip surface code with flux-tunable transmons.

Original language	English
Article number	044031
Number of pages	19
Journal	Physical Review Applied
Volume	22
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevApplied.22.044031
Publication status	Published - 2024

Keywords

artificial neural networks
optoelectronics
quantum circuits
quantum error correction
quantum information with solid state qubits
surface code quantum computing
superconducting qubits
microwave techniques

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10.1103/PhysRevApplied.22.044031

PhysRevApplied.22.044031Final published version, 2.42 MBLicence: CC BY

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AU - Crawford, Ophelia

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AU - Byfield, David

AU - Varbanov, Boris

AU - Terhal, Barbara M.

AU - Dicarlo, Leonardo

AU - Campbell, Earl T.

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Reducing the error rate of a superconducting logical qubit using analog readout information

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