Initial decoherence in solid state qubits

TL;DR

This paper investigates how low and high-frequency noise sources cause decoherence in solid state qubits, revealing complex interactions that affect qubit performance and spectroscopy.

Contribution

It extends existing models to include both classical low-frequency and quantum high-frequency noise, explaining complex decoherence phenomena in solid state qubits.

Findings

Inhomogeneous broadening caused by slow noise sources.

Effects of quantum noise on qubit decoherence.

Interaction between different noise types influences qubit dynamics.

Abstract

We study decoherence due to low frequency noise in Josephson qubits. Non-Markovian classical noise due to switching impurities determines inhomogeneous broadening of the signal. The theory is extended to include effects of high-frequency quantum noise, due to impurities or to the electromagnetic environment. The interplay of slow noise with intrinsically non-gaussian noise sources may explain the rich physics observed in the spectroscopy and in the dynamics of charge based devices.