Generation of quadripartite continuous-variable entanglement in two coupled opto-mechanical systems

Abstract

Macroscopic multiple continuous-variable (CV) entanglement plays a central role in recent CV-based approaches to quantum multipartite network, quantum communication and quantum secret sharing. We propose a novel scheme to generate stationary quadripartite CV entanglement at the macroscopic level in two coupling Fabry–Perot cavities with a flux qutrit. We treat two cavity fields and two movable mirrors as intrinsically quadripartite and study quadripartite CV entanglement among them. We demonstrate that genuine quadripartite CV entanglement can be generated in this system.