Quadripartite entanglement of microwave photons from separated resonators via concurrent parametric interactions in superconducting quantum circuits

Abstract

We present an alternative scheme for generating quadripartite continuous variable entanglement using the dispersion interactions of four separated resonators with a single driven superconducting qubit. We show that the cluster and Greenberger-Horne-Zeilinger (GHZ) entangled states of four output microwave photons can be created at the presence of quantum relaxations. The physical mechanism is proposed in the dressed-state representation of driving interaction. With the proper choice of the physical parameters, the concurrent parametric down-conversion interactions occur among four microwave modes, which are responsible for the four-mode entanglement generation. In practice, our scheme provides a useful approach for the scalable information processing in the solid-state system.