Full characterization of Gaussian bipartite entangled states by a single homodyne detector

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 stat...

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Bibliographic Details
Published inPhysical review letters Vol. 102; no. 2; p. 020502
Main Authors D'Auria, V, Fornaro, S, Porzio, A, Solimeno, S, Olivares, S, Paris, M G A
Format Journal Article
LanguageEnglish
Published United States 16.01.2009
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.102.020502