Radio-Frequency Method for Investigation of Quantum Properties of Superconducting Structures

TL;DR

This paper demonstrates the use of impedance measurement technique (IMT) to characterize superconducting qubits by analyzing their response through a coupled tank circuit, providing a new approach for quantum property investigation.

Contribution

The paper introduces IMT as a novel, effective method for probing the quantum properties of superconducting qubits via tank circuit read-out.

Findings

IMT effectively characterizes superconducting qubits.

Tank circuit response reveals qubit state information.

IMT is a powerful tool for studying two-level quantum systems.

Abstract

We implement the impedance measurement technique (IMT) for characterization of interferometer-type superconducting qubits. In the framework of this method, the interferometer loop is inductively coupled to a high-quality tank circuit. We show that the IMT is a powerful tool to study a response of externally controlled two-level system to different types of excitations. Conclusive information about qubits is obtained from the read-out of the tank properties.