Production and analysis of non-Gaussian radiation fields has evinced a lot of
attention recently. Simplest way of generating such non-Gaussians is through
adding (subtracting) photons to Gaussian fields. Interestingly, when photons
are added to classical Gaussian fields, the resulting states exhibit {\em
non-classicality}. Two important classical Gaussian radiation fields are
coherent and thermal states. Here, we study the non-classical features of such
states when photons are added to them. Non-classicality of these states shows
up in the negativity of the Wigner function. We also work out the {\em
entanglement potential}, a recently proposed measure of non-classicality for
these states. Our analysis reveals that photon added coherent states are
non-classical for all seed beam intensities; their non-classicality increases
with the addition of more number of photons. Thermal state exhibits
non-classicality at all temperatures, when a photon is added; lower the
temperature, higher is their non-classicality.Comment: Version 2, minor revision; new references added, to appear in Eur.
Phys. J. D, 6 pages, 10 figure ps files, RevTe
