Eur. Phys. J. D 40, 133-138 (2006)
https://doi.org/10.1140/epjd/e2006-00135-x

Non-classicality of photon added coherent and thermal radiations

Department of Physics, Bangalore University, Bangalore, 560 056, India

Corresponding author: ^a prabhurama@gmail.com

Received: 6 February 2006
Revised: 24 April 2006
Published online: 15 June 2006

Abstract

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 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 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.