Efficient entanglement criteria beyond Gaussian limits using Gaussian measurements

Details Efficient entanglement criteria beyond Gaussian limits using Gaussian measurements Efficient entanglement criteria beyond Gaussian limits using Gaussian measurements

2012-01-24

arxiv.org/abs/1201.5092v1

Phys. Rev. Lett. 108, 030503 (2012)

Physics

Quantum Physics

published version, 6 pages, 3 figures, including Supplemental Material

Scientific paper

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.

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