Light-Matter Interaction in dispersive Superconducting Circuit QED

• URL: http://arxiv.org/abs/2505.09322v2
• Date: Thu, 15 May 2025 15:33:52 GMT
• Title: Light-Matter Interaction in dispersive Superconducting Circuit QED
• Authors: Harsh Arora, Jay Deshmukh, Ansh Das, R. Vijay, Baladitya Suri,
• Abstract summary: In circuit QED, the interaction between non-linear charge qubits and superconducting resonators invariably involves the qubit coupling to a large set of resonator modes.<n>We show that superconducting dispersion plays a role in determining the effective light-matter interaction cut-off.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: It is well known that superconducting waveguides strongly attenuate the propagation of electromagnetic waves with frequencies beyond the superconducting gap. In circuit QED, the interaction between non-linear charge qubits and superconducting resonators invariably involves the qubit coupling to a large set of resonator modes. So far, strong dispersion effects near and beyond the superconducting-gap have been ignored in quantization models. Rather, it is assumed that the superconducting resonator behaves ideally across the large frequency intervals. We present a quantization approach which includes the superconducting frequency-dependent surface impedance and demonstrate that superconducting dispersion plays a role in determining the effective light-matter interaction cut-off.

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