  As an application in circuit quantum electrodynamics (cQED) coupled systems,
superconducting resonators play an important role in high-sensitivity
measurements in a superconductingsemiconductor hybrid architecture. Taking
advantage of a high-impedance NbTiN resonator, we perform excited-state
spectroscopy on a GaAs double quantum dot (DQD) by applying voltage pulses to
one gate electrode. The pulse train modulates the DQD energy detuning and gives
rise to charge state transitions at zero detuning. Benefiting from the
outstanding sensitivity of the resonator, we distinguish different spin-state
transitions in the energy spectrum according to the Pauli exclusion principle.
Furthermore, we experimentally study how the interdot tunneling rate modifies
the resonator response. The experimental results are consistent with the
simulated spectra based on our model.
