Test of Inseparability Criteria for Squeezed Number States of the Radiation Field |
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Authors: | Fabio Dell’Anno Silvio De Siena Fabrizio Illuminati |
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Affiliation: | (1) Dipartimento di Fisica “E. R. Caianiello” Università di Salerno, Coherentia CNR-INFM, Via S. Allende, 84081 Baronissi, (SA), Italy;(2) INFN Sezione di Napoli – Gruppo Collegato di Salerno, Via S. Allende, 84081 Baronissi, (SA), Italy |
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Abstract: | We investigate the efficiency of inseparability criteria in detecting the entanglement properties of two-mode non-Gaussian states of the electromagnetic field. We focus our study on the relevant class of two-mode squeezed number states. These states combine the entangling capability of two-mode squeezers with the non-Gaussian character (nonclassicality) of number states. They allow for some exact analytical treatments, and include as a particular case the two-mode Gaussian squeezed vacuum. We show that the generalized PPT criterion recently proposed by Shchukin and Vogel, based on higher order statistical moments, is very efficient in detecting the entanglement for this class of non-Gaussian states. |
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