title: Full characterization of Gaussian bipartite entangled states by a single homodyne detector.
abstract: We present the full experimental reconstruction of Gaussian entangled states generated by a type-II optical parametric oscillator below threshold. Our scheme provides the entire covariance matrix using a single homodyne detector and allows for the complete characterization of bipartite Gaussian states, including the evaluation of purity, entanglement, and nonclassical photon correlations, without a priori assumptions on the state under investigation. Our results show that single homodyne schemes are convenient and robust setups for the full characterization of optical parametric oscillator signals and represent a tool for quantum technology based on continuous variable entanglement.
authors.affiliation: Dipartimento di Scienze Fisiche Università Federico II, Napoli, Italy.
authors.forename: V
authors.initials: V
authors.lastname: D'Auria
authors.forename: S
authors.initials: S
authors.lastname: Fornaro
authors.forename: A
authors.initials: A
authors.lastname: Porzio
authors.forename: S
authors.initials: S
authors.lastname: Solimeno
authors.forename: S
authors.initials: S
authors.lastname: Olivares
authors.forename: M G A
authors.initials: MG
authors.lastname: Paris