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.