In-situ Characterization of Light-Matter Coupling in Multimode Circuit-QED Systems
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arXiv
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| Auteurs principaux: | , , , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866914372900618240 |
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| author | O'Brien, Kellen Lee, Won Chan Behne, Alexandra Fahimniya, Ali Wang, Yu-Xin Amouzegar, Maya Gorshkov, Alexey V. Kollár, Alicia J. |
| author_facet | O'Brien, Kellen Lee, Won Chan Behne, Alexandra Fahimniya, Ali Wang, Yu-Xin Amouzegar, Maya Gorshkov, Alexey V. Kollár, Alicia J. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_05583 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | In-situ Characterization of Light-Matter Coupling in Multimode Circuit-QED Systems O'Brien, Kellen Lee, Won Chan Behne, Alexandra Fahimniya, Ali Wang, Yu-Xin Amouzegar, Maya Gorshkov, Alexey V. Kollár, Alicia J. Quantum Physics Atomic Physics 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. |
| title | In-situ Characterization of Light-Matter Coupling in Multimode Circuit-QED Systems |
| topic | Quantum Physics Atomic Physics |
| url | https://arxiv.org/abs/2603.05583 |