Characterizations of classical and nonclassical states of quantized radiation

摘要: A new operator-based condition for distinguishing classical from nonclassical states of quantized radiation is developed. It exploits the fact that normal ordering rule correspondence to go quantum-dynamical variables does not in general maintain positivity. shown approach naturally leads several layers increasing nonclassicality, with more as number modes increases. generalization notion sub-Poissonian statistics two-mode fields achieved by analysing completely all correlations and fluctuations quadratic combinations mode annihilation creation operators conserving total photon number. This nontrivial intrinsically it goes beyond possible single projections field. The nonclassicality pair-coherent states, squeezed vacuum thermal analysed contrasted one another, comparing generalized extant signatures behaviour.