Cramer, J., Kalb, N., Rol, M.A., Hensen, B., Blok, M.S., Markham, M., Twitchen, D.J., Hanson, R. and Taminiau, T.H. (2016) Repeated Quantum Error Correction on a Continuously Encoded Qubit by Real-Time Feedback. Nature Communications, 7, Article No. 11526.
https://doi.org/10.1038/ncomms11526

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.