In-situ Characterization of Light-Matter Coupling in Multimode Circuit-QED Systems

• URL: http://arxiv.org/abs/2603.05583v1
• Date: Thu, 05 Mar 2026 19:00:00 GMT
• Title: In-situ Characterization of Light-Matter Coupling in Multimode Circuit-QED Systems
• Abstract summary: Multimode cavity-QED systems can be leveraged to explore a wide range of physical phenomena.<n>Here we present a general measurement protocol, applicable to both atomic and synthetic cavity-QED systems.
• Score: 35.385961271886316
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Multimode cavity-QED systems can be leveraged to explore a wide range of physical phenomena; however, a complex multimode environment makes systematic characterization of light-matter interactions challenging. Here we present a general measurement protocol, applicable to both atomic and synthetic cavity-QED systems, that enables the determination of coupling to individual photonic modes. The method leverages measurements of the AC-Stark and Kerr effects, along with known detuning dependencies, to eliminate the need for single-photon resolution, independent photon-number calibration, or insertion-loss calibration. We demonstrate the method using a superconducting transmon qubit coupled to a one-dimensional microwave resonator lattice. We validate the consistency of the extracted light-matter couplings $g$ determined at multiple qubit detunings, and from the self-Kerr and cross-Kerr shifts for three photon modes, which provide separate measurements of $g$ for each of the three modes.

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