Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 26: Quantum Optics IV

Q 26.6: Talk

Tuesday, March 1, 2016, 15:45–16:00, f442

Unified nonclassicality criteria and continuous sampling — •Semjon Köhnke, Sergej Ryl, Elizabeth Agudelo, Jan Sperling, Melanie Mraz, Boris Hage, and Werner Vogel — Arbeitsgruppe Experimentelle Quantenoptik, Institut für Physik, Universität Rostock, D-18059 Rostock, Germany

One principle scope of quantum physics is the formulation of measurable conditions, which are fulfilled for classical systems but may be violated for nonclassical ones. Hence a number of nonclassicality criteria have been formulated to certify quantum features of states.

One hierarchy is based on Bochner’s theorem and the characteristic function of the Glauber-Sudarshan representation (P function). Another hierarchy is formulated in terms of the matrix of moments. We combine the advantages of the CF and the MOM of the P function, resulting in a generalization of Bochner’s theorem. For applications of the generalized nonclassicality probes, we provide direct sampling formulas for balanced homodyne detection. A squeezed vacuum state is experimentally realized and characterized with our method.

Furthermore we present a continuous phase sampling technique. In contrast to discrete phase-locked measurements, the continuous sampling of a regularized P function allows an unconditional verification of nonclassicality, as we demonstrate for the phase-sensitive squeezed vacuum state.