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Direct Sampling of Negative Quasiprobabilities of a Squeezed State

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons40457

Hage,  B.
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons40490

Schnabel,  R.
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

Externe Ressourcen
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Volltexte (frei zugänglich)

1105.4591
(Preprint), 457KB

PRL107_113604.pdf
(beliebiger Volltext), 369KB

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Zitation

Kiesel, T., Vogel, W., Hage, B., & Schnabel, R. (2011). Direct Sampling of Negative Quasiprobabilities of a Squeezed State. Physical Review Letters, 107: 113604. doi:10.1103/PhysRevLett.107.113604.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-03EF-2
Zusammenfassung
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.