title: Efficient entanglement criteria beyond Gaussian limits using Gaussian measurements.
abstract: We present a formalism to derive entanglement criteria beyond the Gaussian regime that can be readily tested by only homodyne detection. The measured observable is the Einstein-Podolsky-Rosen (EPR) correlation. Its arbitrary functional form enables us to detect non-Gaussian entanglement even when an entanglement test based on second-order moments fails. We illustrate the power of our experimentally friendly criteria for a broad class of non-Gaussian states under realistic conditions. We also show rigorously that quantum teleportation for continuous variables employs a specific functional form of EPR correlation.
authors.affiliation: Department of Physics, Texas A & M University at Qatar, PO Box 23874, Doha, Qatar. hyunchul.nha@qatar.tamu.edu
authors.forename: Hyunchul
authors.initials: H
authors.lastname: Nha
authors.forename: Su-Yong
authors.initials: SY
authors.lastname: Lee
authors.forename: Se-Wan
authors.initials: SW
authors.lastname: Ji
authors.forename: M S
authors.initials: MS
authors.lastname: Kim