Decoherence of a qubit by non-Gaussian noise at an arbitrary working point

TL;DR

This paper develops an exact method to analyze qubit decoherence caused by non-Gaussian noise, applicable at any working point, enhancing understanding of noise effects in quantum systems.

Contribution

It introduces a novel exact formula for phase memory functional under non-Gaussian noise, specifically for independent random telegraph sources, at arbitrary qubit working points.

Findings

Exact phase memory functional derived for non-Gaussian noise

Applicable to arbitrary qubit working points

Enhanced understanding of decoherence mechanisms

Abstract

The decoherence of a qubit due to a classical non-Gaussian noise with correlation time longer than the decoherence time is discussed for arbitrary working points of the qubit. A method is developed that allows an exact formula for the phase memory functional in the presence of independent random telegraph noise sources to be derived.