Dynamical suppression of telegraph and 1/f noise due to quantum bistable fluctuator

TL;DR

This paper investigates how dynamical decoupling techniques can suppress non-Gaussian quantum noise, such as telegraph and 1/f noise, in qubits, revealing universal behaviors at high pulse frequencies and variable effects at intermediate frequencies.

Contribution

It provides analytic and numerical analysis of dynamical decoupling effects on non-Gaussian quantum noise, extending understanding to a broader class of environments.

Findings

Universal noise suppression at high pulse frequencies

Noise can be either suppressed or enhanced at intermediate frequencies

Technique applicable to various non-Gaussian environments

Abstract

We study dynamical decoupling of a qubit from non gaussian quantum noise due to discrete sources, as bistable fluctuators and 1/f noise. We obtain analytic and numerical results for generic operating point. For very large pulse frequency, where dynamic decoupling compensates decoherence, we found universal behavior. At intermediate frequencies noise can be compensated or enhanced, depending on the nature of the fluctuators and on the operating point. Our technique can be applied to a larger class of non-gaussian environments.