Author(s)

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

Instituto de Fsica Teórica, Universidad Autónoma de Madrid, Madrid, Spain.

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.

Quantum Computing, Error Mitigation, CHSH Inequalities

Bultrini, D. , Gordon, M. , López, E. and Sierra, G. (2021) Simple Mitigation Strategy for a Systematic Gate Error in IBMQ. Journal of Applied Mathematics and Physics, 9, 1215-1229. doi: 10.4236/jamp.2021.96083.