Decoherence of the Superconducting Persistent Current Qubit

TL;DR

This paper presents a theoretical analysis of decoherence in a superconducting persistent current qubit, showing that decoherence sources are weak and the qubit has a high quality factor, indicating good coherence properties.

Contribution

It provides a simple theoretical framework to estimate decoherence in superconducting qubits and demonstrates the potential for high coherence in a specific design.

Findings

Decoherence sources are weak in the proposed design.

The qubit exhibits a high quality factor.

The theory estimates decoherence effects effectively.

Abstract

Decoherence of a solid state based qubit can be caused by coupling to microscopic degrees of freedom in the solid. We lay out a simple theory and use it to estimate decoherence for a recently proposed superconducting persistent current design. All considered sources of decoherence are found to be quite weak, leading to a high quality factor for this qubit.