Non-classicality of photon added coherent and thermal radiations
Department of Physics, Bangalore University, Bangalore, 560 056, India
Corresponding author: a email@example.com
Revised: 24 April 2006
Published online: 15 June 2006
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.
PACS: 42.50.Dv – Nonclassical states of the electromagnetic field, including entangled photon states; quantum state engineering and measurements / 03.65.Wj – State reconstruction, quantum tomography / 03.67.Mn – Entanglement production, characterization, and manipulation
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006