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

TL;DR

This paper investigates how postselected von Neumann measurements influence the nonclassical properties of single-photon-added coherent states, revealing enhanced nonclassicality under specific measurement conditions.

Contribution

It provides explicit analytical expressions for field properties of SPACS after measurement and demonstrates the enhancement of nonclassicality through postselection.

Findings

SPACS exhibit increased sub-Poissonian photon statistics after measurement

Nonclassicality is significantly altered by measurement in certain regimes

Large weak values correlate with stronger nonclassical features

Abstract

The effects of von Neumann postselected measurement on nonclassicality of single-photon-added coherent state (SPACS) are studied. Explicit expressions and analytical results for various field properties of SPACS such as the photon number distribution, the Mandel Q_{m} factor and the squeezing parameter of field quadrature after postselected von Neumann 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.