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

Journal article (2024)

Authors

H.A.S. Ali QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, QCD/DiCarlo Lab - QuTech Advanced Research Centre
J.M. Ferreira Marques QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, QCD/DiCarlo Lab - QuTech Advanced Research Centre
Ophelia Crawford Riverlane Ltd
Joonas Majaniemi Riverlane Ltd
M. Serra-Peralta QuTech Advanced Research Centre, QCD/Terhal Group - QuTech Advanced Research Centre
David Byfield Riverlane Ltd
B.M. Varbanov QCD/Terhal Group - QuTech Advanced Research Centre , QuTech Advanced Research Centre
B.M. Terhal Discrete Mathematics and Optimization - EEMCS , QuTech Advanced Research Centre
L. DiCarlo QCD/DiCarlo Lab - QuTech Advanced Research Centre , Kavli institute of nanoscience Delft, QN/DiCarlo Lab - AS , QuTech Advanced Research Centre
Earl T. Campbell University of Sheffield, Riverlane Ltd
Research Group
QCD/DiCarlo Lab (QuTech Advanced Research Centre) (TU Delft)
More Info
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Published Date

2024

Language

English

Faculty

QuTech Advanced Research Centre

Department

Quantum Computing Division

Research Group

QCD/DiCarlo Lab

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.