Multimode Strong-Coupling Processes in Circuit QED Lattices

• URL: http://arxiv.org/abs/2605.00983v1
• Date: Fri, 01 May 2026 18:00:01 GMT
• Title: Multimode Strong-Coupling Processes in Circuit QED Lattices
• Abstract summary: We present a circuit Lagrangian analysis which captures beyond tight-binding effects of strong photon-photon coupling.<n>Our circuit analysis reveals qualitatively new features such as emergent band gaps, lifted degeneracies, broadened flat bands, and frequency-dependent hopping.
• Score: 35.385961271886316
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Circuit QED systems provide an ideal platform for exploring the strong-coupling regime of multimode cavity QED. Here we present two new phenomena from multimode strong coupling: a circuit Lagrangian analysis which captures beyond tight-binding effects of strong photon-photon coupling and experimental observation of strong wave-mixing resonances in the qubit response. Our circuit analysis reveals qualitatively new features such as emergent band gaps, lifted degeneracies, broadened flat bands, and frequency-dependent hopping. Within the multimode photon environment, strong qubit-photon coupling in turn gives rise to multiphoton processes involving multiple normal modes. We demonstrate a strong four-wave-mixing process involving excitation of a qubit and simultaneous frequency conversion between modes. Notably, this wave-mixing process is dominated by localized flat-band modes of the photonic lattice, which exhibit the strongest coupling to the transmon qubit.

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