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Proceedings Paper

Complete bi-partite CV entanglement characterization via coveriance matrix measurement
Author(s): Alberto Porzio; Virginia D'Auria; Stefano Fornaro; Salvatore Solimeno
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Paper Abstract

We report the first complete experimental reconstruction of the covariance matrix (CM) relative to a bi-partite continuous variable (CV) entangled state outing a non degenerate optical parametric oscillator (OPO) below threshold. The covariance matrix CM has been reconstructed following the method reported in V. D'Auria et al., J. Opt. B 7, S750 (2005). The two entangled beams (signal (a) and idler (b)) are produced by a by a continuous wave (CW) optical parametric oscillator (OPO) via type-II (same frequency but with orthogonal polarizations), phase matching and working below threshold. Our experimental setup makes use of a single homodyne detector and of a compact source of entangled beams. The quadratures values and other relevant quantities are reconstructed by quantum tomography, without making any a priori assumption on the state under evalutation.

Paper Details

Date Published: 18 May 2009
PDF: 10 pages
Proc. SPIE 7355, Photon Counting Applications, Quantum Optics, and Quantum Information Transfer and Processing II, 73550B (18 May 2009); doi: 10.1117/12.820351
Show Author Affiliations
Alberto Porzio, CNR-INFM Coherentia, Univ. Monte Sant'Angelo (Italy)
Virginia D'Auria, CNR-INFM Coherentia, Univ. Monte Sant'Angelo (Italy)
Univ. degli Studi di Napoli Federico II (Italy)
Stefano Fornaro, Univ. degli Studi di Napoli Federico II (Italy)
Salvatore Solimeno, CNR-INFM Coherentia, Univ. Monte Sant'Angelo (Italy)
Univ. degli Studi di Napoli Federico II (Italy)


Published in SPIE Proceedings Vol. 7355:
Photon Counting Applications, Quantum Optics, and Quantum Information Transfer and Processing II
Miloslav Dusek; Ivan Prochazka; Roman Sobolewski, Editor(s)

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