Correlated spectrum of distant semiconductor qubits coupled by microwave photons

We develop a new spectroscopic method to quickly and intuitively characterize the coupling of two microwave-photon-coupled semiconductor qubits via a high-impedance resonator. Highly distinctive and unique geometric patterns are revealed as we tune the qubit tunnel couplings relative to the frequency of the mediating photons. These patterns are in excellent agreement with a simulation using the Tavis-Cummings model, and allow us to readily identify different parameter regimes for both qubits in the detuning space. This method could potentially be an important component in the overall spectroscopic toolbox for quickly characterizing certain collective properties of multiple cavity quantum electrodynamics (QED) coupled qubits. (c) 2020 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.

Automated summary

A new spectroscopic method was developed to characterize the coupling of two microwave-photon-coupled semiconductor qubits via a high-impedance resonator, revealing distinctive geometric patterns that align with simulation results. This method could be a key component in quickly characterizing collective properties of multiple cavity QED-coupled qubits.