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 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.
D'Auria
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Dipartimento di Scienze Fisiche Università Federico II, Napoli, Italy.
Fornaro
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Porzio
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Solimeno
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Olivares
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Paris
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MG