Effects of postselected von Neumann measurement on nonclassicality of single-photon-added coherent state

Abstract

The effects of von Neumann postselected measurement on the nonclassicality of single-photonadded coherent state (SPACS) are studied. Explicit expressions and analytical results for various field properties of SPACS such as the photon number distribution, the Mandel Qm factor and the squeezing parameter of field quadrature after postselected von-Neuman measurement are investigated. The results showed that the nonclassicality of SPACS after measurement changed dramatically than initial state. The measurement let SPACS possess more strong sub-Poissonian photon statistics in some definite coupling strength regimes and large weak values which accompanied by low postselection probabilities.