Jan Perina (Palacky University, Olomouc, Czech Republic)

Identification and quantification of nonclassicality of experimental optical fields

Nonclassical optical fields are useful in numerous applications at present. Identification and quantification of their nonclassicality thus represents an important task. In the talk, identification of nonclassicality of optical fields via the so-called nonclassicality witnesses will be discussed in general using the experimental intensity moments as well as the measured photocount histograms (photon-number distributions). Different methods for the derivation of nonclassicality witnesses will be discussed and compared considering a general N-mode optical field. Applicability of the nonclassicality witnesses based on intensity moments and elements of photocount histograms (photon-number distributions) will be discussed. Quantification of the nonclassicality in relation to the discussed nonclassicality witnesses and using the concept of the Lee nonclassicality depth will also be mentioned. Photocount and photon-number distributions belonging to several types of experimental single mode, two-mode as well as three-mode non-classical optical fields (sub-Poissonian fields, fields with (anti-)correlations in photocounts and photon numbers) will be used to demonstrate the general results.