Abstract
Ultrastrong coupling in circuit quantum electrodynamics makes enhanced fast quantum operations possible. We present a scheme to realize controllable qubit-resonator interactions in ultrastrong circuit quantum electrodynamics with the aid of a unitary transformation. The controllable qubit-resonator interaction is just one type of the so-called selective resonant interactions. From the effective dynamics, it is possible to create the multipartite Dicke states at nanoseconds with high fidelity if the large detuning constraint of the selective resonant interaction is fulfilled. We also investigate the performance of our scheme in the presence of decoherence. Our results present a promising way toward achieving enhanced fast generation of the Dicke states.