Demonstrating higher-order nonclassical effects by photon-added classical states: Realistic schemes

TL;DR

This paper demonstrates that photon-added classical states exhibit higher-order nonclassical effects, providing a new avenue for observing quantum properties beyond traditional sub-Poissonian statistics and squeezing.

Contribution

It introduces a realistic scheme showing that photon-added classical states display generalized nonclassical features in all orders, advancing the study of higher-order quantum effects.

Findings

Photon-added classical states exhibit nonclassical effects in all orders.

Higher-order nonclassical effects are robust against experimental imperfections.

The scheme offers a practical method for studying quantum nonclassicality.

Abstract

Detecting nonclassical properties that do not allow classical interpretation of photoelectric counting events is one of the crucial themes in quantum optics. Observation of individual nonclassical effects for a single-mode field, however, has been so far practically confined to sub-Poissonian statistics and quadrature squeezing. We show that a photon-added classical (coherent or thermal) state exhibits generalized nonclassical features in all orders of creation and annihilation operators, thereby becoming a promising candidate for studying higher-order nonclassical effects. Our analysis demonstrates robustness of these effects against nonideal experimental conditions.