Microscopic and Mesoscopic Junction Models for the Readout of Superconducting Qubits

Reliable high-fidelity qubit readout is essential for scalable quantum processors, with Josephson junction dynamics playing a decisive role in superconducting qubit architectures. This talk explores microscopic and mesoscopic models of junctions in the context of circuit quantum electrodynamics. Microscopic descriptions capture tunneling, dissipation, and noise at the junction level, while mesoscopic models provide an effective framework for system-level simulation and design. By linking these perspectives, we identify how transport in the junctions translates to parametric amplification for the readout of qubit information and present strategies for improved device performance. The presentation will highlight recent advances in modeling approaches and their implications for the engineering of robust superconducting qubit readout.