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Phys Rev Lett. 2011 Sep 9;107(11):113604. Epub 2011 Sep 8.

Direct sampling of negative quasiprobabilities of a squeezed state.

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  • 1Arbeitsgruppe Quantenoptik, Institut für Physik, Universität Rostock, D-18051 Rostock, Germany.

Abstract

Although squeezed states are nonclassical states, so far, their nonclassicality could not be demonstrated by negative quasiprobabilities. In this work we derive pattern functions for the direct experimental determination of so-called nonclassicality quasiprobabilities. The negativities of these quantities turn out to be necessary and sufficient for the nonclassicality of an arbitrary quantum state and are therefore suitable for a direct and general test of nonclassicality. We apply the method to a squeezed vacuum state of light that was generated by parametric down-conversion in a second-order nonlinear crystal.

PMID:
22026668
DOI:
10.1103/PhysRevLett.107.113604
[PubMed]
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