Probing strongly driven and strongly coupled superconducting qubit-resonator system

TL;DR

This paper explores the complex quantum interference phenomena in a strongly driven, strongly coupled superconducting qubit-resonator system, revealing deviations from traditional Landau-Zener-Stückelberg-Majorana interferometry due to energy level distortions.

Contribution

It provides a detailed experimental and theoretical analysis of quantum interference effects in a hybrid superconducting qubit-resonator system under strong driving and coupling conditions.

Findings

Observation of quantum interference effects deviating from standard Landau-Zener-Stückelberg-Majorana patterns.

Theoretical description explaining how strong coupling distorts qubit energy levels.

Experimental validation of the distorted interference phenomena.

Abstract

We investigated a strongly driven qubit strongly connected to a quantum resonator. The measured system was a superconducting flux qubit coupled to a coplanar-waveguide resonator which is weakly coupled to a probing feedline. This hybrid qubit-resonator system was driven by a magnetic flux and probed with a weak probe signal through the feedline. We observed and theoretically described the quantum interference effects, deviating from the usual single-qubit Landau-Zener-St\"{u}ckelberg-Majorana interferometry, because the strong coupling distorts the qubit energy levels.