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Probing higher-order transitions through scattering of microwave photons in the ultrastrong-coupling regime of circuit QED
Higher-order transitions can occur in the ultrastrong-coupling regime of circuit QED through virtual processes governed by the counter-rotating interactions. We propose a feasible way to probe higher-order transitions through the scattering of propagating microwave photons incident on the hybrid qubit-cavity system. The line shapes in the scattering spectra can indicate …