Correlated spectrum of distant semiconductor qubits coupled by microwave photons

• Published in: Science bulletin (Beijing) Vol. 66; no. 4; pp. 332 - 338
• Main Authors: Wang, Baochuan, Lin, Ting, Li, Haiou, Gu, Sisi, Chen, Mingbo, Guo, Guangcan, Jiang, Hongwen, Hu, Xuedong, Cao, Gang, Guo, Guoping
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 26-02-2021
• Subjects: Cavity quantum electrodynamics; Quantum computation; Semiconductor quantum dot; Semiconductor qubit; Strong coupling; Cavity quantum electrodynamics; Semiconductor qubit; Quantum computation; Semiconductor quantum dot; Strong coupling
• ISSN: 2095-9273
• DOI: 10.1016/j.scib.2020.10.005

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.