Scientific Results

Nonclassicality quasiprobability of single-photon-added thermal states

Year: 2011

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

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

Abstract: We report the experimental reconstruction of a nonclassicality quasiprobability for a single-photon-added thermal state. This quantity has significant negativities, which is necessary and sufficient for the nonclassicality of the quantum state. Our method exhibits several advantages compared to the reconstruction of the P function, since the nonclassicality filters used in this case can regularize the quasiprobabilities as well as their statistical uncertainties. A priori assumptions about the quantum state are therefore not necessary. We also demonstrate that, in principle, our method is not limited by small quantum efficiencies.

Journal/Review: PHYSICAL REVIEW A

Volume: 83 (3)      Pages from: 032116  to: 032116

More Information: This work was supported by the Deutsche Forschungsgemeinschaft through SFB 652, and partially supported by Ente Cassa di Risparmio di Firenze and Regione Toscana under project CTOTUS.
KeyWords: Nonclassicality; P-function; Quantum state; Quasiprobability; Statistical uncertainty; Thermal state, Particle beams; Photons, Quantum theory
DOI: 10.1103/PhysRevA.83.032116

Citations: 37
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English