Efficient entanglement criteria beyond Gaussian limits using Gaussian measurements.
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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.
author list (cited authors)
Nha, H., Lee, S., Ji, S., & Kim, M. S.
complete list of authors
Nha, Hyunchul||Lee, Su-Yong||Ji, Se-Wan||Kim, MS