Scientific Results

Experimental determination of a nonclassical Glauber-Sudarshan P function

Year: 2008

Authors: Kiesel T., Vogel W., Parigi V., Zavatta A., Bellini M.

Autors Affiliation: Arbeitsgruppe Quantenoptik, Institut für Physik, Universität Rostock, D-18051 Rostock, Germany; Department of Physics, University of Florence, I-50019 Sesto Fiorentino, Florence, Italy and LENS, Via Nello Carrara 1, 50019 Sesto Fiorentino, Florence, Italy; LENS, Via Nello Carrara 1, 50019 Sesto Fiorentino, Florence, Italy and Istituto Nazionale di Ottica Applicata, CNR, L. go E. Fermi, 6, I-50125, Florence, Italy

Abstract: A quantum state is nonclassical if its Glauber-Sudarshan P function fails to be interpreted as a probability density. This quantity is often highly singular, so that its reconstruction is a demanding task. Here we present the experimental determination of a well-behaved P function showing negativities for a single-photon-added thermal state. This is a direct visualization of the original definition of nonclassicality. The method can be useful under conditions for which many other signatures of nonclassicality would not persist.

Journal/Review: PHYSICAL REVIEW A

Volume: 78 (2)      Pages from: 021804  to: 021804

More Information: This work was partially supported by Ente Cassa di Risparmio di Firenze and CNR, under the RSTL initiative.
KeyWords: Electron energy levels, Direct visualization; Experimental determination; Non-classicality; P-function; Probability densities; Quantum states, Probability density function
DOI: 10.1103/PhysRevA.78.021804

Citations: 57
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