D'Auria V, Fornaro S, Porzio A, Solimeno S, Olivares S, Paris MGA. Full characterization of Gaussian bipartite entangled states by a single homodyne detector.
PHYSICAL REVIEW LETTERS 2009;
102:020502. [PMID:
19257255 DOI:
10.1103/physrevlett.102.020502]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2008] [Indexed: 05/27/2023]
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.
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