Floquet state depletion in ac-driven circuit QED

TL;DR

This paper investigates the behavior of Floquet states in a strongly driven double quantum dot system coupled to a resonator, revealing interference patterns and ground state depletion effects through spectroscopy and theoretical modeling.

Contribution

It demonstrates the experimental observation of Floquet state depletion and interference patterns in a circuit QED system under strong microwave driving, supported by theoretical simulations.

Findings

Observation of Landau-Zener-Stückelberg-Majorana interference patterns

Detection of ground state depletion in a driven two-level system

Agreement between experimental results and theoretical models

Abstract

We perform Floquet spectroscopy in a GaAs double quantum dot system coupled to a high-impedance superconducting resonator. By applying microwave induced consecutive passages under a double resonance condition, we observe novel Landau-Zener-St\"uckelberg-Majorana interference patterns that stem from a cavity-assisted interference pattern modified by the depletion of the ground state. Our experimental results reveal the stationary state behavior of a strongly driven two-level system, and are consistent with the simulations based on our theoretical model. This study provides an excellent platform for investigating the dynamics of Floquet states in the presence of strong driving.