We address the issue of quantifying the non-Gaussian character of a bosonic quantum state and introduce a non-Gaussianity measure based on the Hilbert-Schmidt distance between the state under examination and a reference Gaussian state. We analyze in detail the properties of the proposed measure and exploit it to evaluate the non-Gaussianity of some relevant single-mode and multimode quantum states. The evolution of non-Gaussianity is also analyzed for quantum states undergoing the processes of Gaussification by loss and de-Gaussification by photon-subtraction. The suggested measure is easily computable for any state of a bosonic system and allows one to define a corresponding measure for the non-Gaussian character of a quantum operation.
Measure of the non-Gaussian character of a quantum state / M.G. Genoni, M.G.A. Paris, K. Banaszek. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 76:4(2007), pp. 042327.042327-1-042327.042327-6.
|Titolo:||Measure of the non-Gaussian character of a quantum state|
PARIS, MATTEO (Secondo)
|Settore Scientifico Disciplinare:||Settore FIS/03 - Fisica della Materia|
|Data di pubblicazione:||2007|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1103/PhysRevA.76.042327|
|Appare nelle tipologie:||01 - Articolo su periodico|