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We have developed a theory of parametric photon generation in the waveguidescoupled to arrays of qubits with temporally modulated resonance frequencies.Such generation can be interpreted as a dynamical Casimir effect. Wedemonstrate numerically and analytically how the emission directionality andphoton-photon correlations can be controlled by the phases of the modulation.The emission spectrum is shown to be strongly dependent on the qubitanharmonicity parameter. Single- and double-excited state resonances have beenidentified in the emission spectrum.

Resonant Dynamical Casimir Effect in Waveguide-coupled Qubit Arrays