Non-classicality of photon added coherent and thermal radiations

Quantum Optics and Quantum Information


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.


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 


02.10.+t Quantum-Classical Transition 01.30.+r Quantum states and dynamics as a resource for information processing 


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© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Authors and Affiliations

  1. 1.Department of PhysicsBangalore UniversityBangaloreIndia

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