Eur. Phys. J. D (2014) 68: 164
https://doi.org/10.1140/epjd/e2014-40834-y

Regular Article

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

Department of Applied Physics, East China Jiaotong University, Nanchang 330013, P.R. China

^a e-mail: glingcheng@ecjtu.edu.cn

Received: 28 December 2013
Received in final form: 2 April 2014
Published online: 27 June 2014

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.