title: Experimental preparation of quadripartite cluster and Greenberger-Horne-Zeilinger entangled states for continuous variables.
abstract: The cluster states and Greenberger-Horne-Zeilinger (GHZ) states are two different types of multipartite quantum entangled states. We present the first experimental results generating continuous variable quadripartite cluster and GHZ entangled states of electromagnetic fields. Utilizing two amplitude-quadrature and two phase-quadrature squeezed states of light and linearly optical transformations, the two types of entangled states for amplitude and phase quadratures of light are experimentally produced. The combinations of the measured quadrature variances prove the full inseparability of the generated four subsystems. The presented experimental schemes show that the multipartite entanglement of continuous variables can be deterministically generated with the relatively simple implementation.
authors.affiliation: The State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan, 030006, People's Republic of China.
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Su
authors.forename: Aihong
authors.initials: A
authors.lastname: Tan
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Jia
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.forename: Changde
authors.initials: C
authors.lastname: Xie
authors.forename: Kunchi
authors.initials: K
authors.lastname: Peng