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Campagne-Ibarcq, P., Eickbusch, A., Touzard, S., Zalys-Geller, E., Frattini, N.E., Sivak, V.V., et al. (2020) Quantum Error Correction of a Qubit Encoded in Grid States of an Oscillator. Nature, 584, 368-372.
https://doi.org/10.1038/s41586-020-2603-3

has been cited by the following article:

• TITLE: Simple Mitigation Strategy for a Systematic Gate Error in IBMQ

  AUTHORS: Daniel Bultrini, Max Hunter Gordon, Esperanza López, Germán Sierra

  KEYWORDS: Quantum Computing, Error Mitigation, CHSH Inequalities

  JOURNAL NAME: Journal of Applied Mathematics and Physics, Vol.9 No.6, June 15, 2021

  ABSTRACT: In this paper, we report the observation and characterisation of a systematic error in the implementation of U3 gates in the IBM quantum computers. By measuring the effect of this gate for various rotation angles the error appears as an over-rotation, whose magnitude does not correlate with IBM’s cited errors calculated using Clifford randomized benchmarking. We propose a simple mitigation procedure to limit the effects of this error. We show that using a simple mitigation strategy one can obtain improved results in the observed value for the CHSH inequality, measured in a cloud-based quantum computer. This work highlights the utility of simple mitigation strategies for short-depth quantum circuits.