Qubit noise deconvolution

TL;DR

This paper introduces a noise deconvolution method for qubit systems that effectively removes common noise types, enabling more accurate measurement of quantum observables both in simulations and on real hardware.

Contribution

It derives inverse maps for typical single qubit noisy channels and demonstrates their use in noise removal during data processing, improving measurement accuracy.

Findings

Successful deconvolution of a generic Pauli channel in simulations

Experimental noise removal on Rigetti quantum hardware

Enhanced accuracy of quantum measurements after deconvolution

Abstract

We present a noise deconvolution technique to remove a wide class of noises when performing arbitrary measurements on qubit systems. In particular, we derive the inverse map of the most common single qubit noisy channels and exploit it at the data processing step to obtain noise-free estimates of observables evaluated on a qubit system subject to known noise. We illustrate a self-consistency check to ensure that the noise characterization is accurate providing simulation results for the deconvolution of a generic Pauli channel, as well as experimental evidence of the deconvolution of decoherence noise occurring on Rigetti quantum hardware.