Entanglement of two-mode Gaussian states: characterization and experimental production and manipulation

A powerful theoretical structure has emerged in recent years on the characterization and quantification of entanglement in continuous-variable systems. After reviewing this framework, we will illustrate it with an original setup based on a type-II OPO with adjustable mode coupling. Experimental results allow a direct verification of many theoretical predictions and provide a sharp insight into the general properties of two-mode Gaussian states and entanglement resource manipulation. PACS numbers: 03.67.Mn, 42.65.Yj, 42.50.Dv, 42.50.Lc § To whom correspondence should be addressed ([email protected]) Entanglement of two-mode Gaussian states: characterization and experimental . . . 2