Hybrid rf SQUID qubit based on high kinetic inductance

TL;DR

This paper presents a hybrid rf SQUID qubit using high kinetic inductance TiN films, demonstrating small size, high anharmonicity, and potential for studying dissipation and decoherence in disordered superconducting films.

Contribution

Introduction of a hybrid rf SQUID qubit with high kinetic inductance TiN films, highlighting its compactness and suitability for investigating decoherence mechanisms.

Findings

Small physical size of the qubits.

High anharmonicity observed.

Potential to study dissipation in disordered films.

Abstract

We report development and microwave characterization of rf SQUID (Superconducting QUantum Interference Device) qubits, consisting of an aluminium-based Josephson junction embedded in a superconducting loop patterned from a thin film of TiN with high kinetic inductance. Here we demonstrate that the systems can offer small physical size, high anharmonicity, and small scatter of device parameters. The hybrid devices can be utilized as tools to shed further light onto the origin of film dissipation and decoherence in phase-slip nanowire qubits, patterned entirely from disordered superconducting films.