Entanglement generation in persistent current qubits

TL;DR

This paper explores how entanglement can be generated between two persistent current qubits and examines how fluctuations in control fields influence the entanglement, impacting practical quantum system design.

Contribution

It analyzes the effects of classical and quantum control field fluctuations on entanglement in coupled persistent current qubits.

Findings

Fluctuations in bias fields suppress entanglement.

Quantum control fields can mitigate some fluctuation effects.

Entanglement generation is sensitive to control field stability.

Abstract

In this paper we investigate the generation of entanglement between two persistent current qubits. The qubits are coupled inductively to each other and to a common bias field, which is used to control the qubit behaviour and is represented schematically by a linear oscillator mode. We consider the use of classical and quantum representations for the qubit control fields and how fluctuations in the control fields tend to suppress entanglement. In particular, we demonstrate how fluctuations in the bias fields affect the entanglement generated between persistent current qubits and may limit the ability to design practical systems.