Data di Pubblicazione:
2010
Citazione:
Quantum characterization of bipartite Gaussian states / D. Buono, G. Nocerino, V. D'Auria, A. Porzio, S. Olivares, M. Paris. - In: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. B, OPTICAL PHYSICS. - ISSN 0740-3224. - 27:6(2010), pp. A110-A118.
Abstract:
Gaussian bipartite states are basic tools for the realization of quantum information protocols with continuous
variables. Their complete characterization is obtained by the reconstruction of the corresponding covariance
matrix. Here we describe in detail and experimentally demonstrate a robust and reliable method to fully char-
acterize bipartite optical Gaussian states by means of a single homodyne detector. We have successfully ap-
plied our method to the bipartite states generated by a sub-threshold type-II optical parametric oscillator
which produces a pair of thermal cross-polarized entangled cw frequency degenerate beams. The method pro-
vides a reliable reconstruction of the covariance matrix and allows us to retrieve all the physical information
about the state under investigation. These include observable quantities, such as energy and squeezing, as
well as nonobservable ones such as purity, entropy, and entanglement. Our procedure also includes advanced
tests for the Gaussianity of the state and, overall, representsapowerfultooltostudythebipartiteGaussianstate from the generation stage to the detection one.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
D. Buono, G. Nocerino, V. D'Auria, A. Porzio, S. Olivares, M. Paris
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