Investigating nonclassicality in nonlinear electronic spectroscopy

TL;DR

This paper develops a theoretical framework linking nonlinear electronic spectroscopy signals to nonclassicality, enabling experimental detection of quantum coherence through observable polarization measurements.

Contribution

It introduces a method to infer nonclassicality from electronic spectroscopy data by connecting it to the non-disturbance condition, a novel approach in quantum spectroscopy.

Findings

Established a link between spectroscopy signals and nonclassicality

Expressed nonclassicality witness in terms of measurable observables

Provided a theoretical basis for experimental detection of quantum coherence

Abstract

In this work, we establish a connection between nonlinear electronic spectroscopy and the protocol for the non-disturbance condition, the non-fullfilment of which is a witness of nonclassicality and can be related to the presence of coherence. Our approach permits us to express the nonclassicality witness condition in terms of common observables in the context of electronic spectroscopy experiments, such as the induced polarization. In this way, we provide the theoretical framework allowing one to infer nonclassicality from the detected signals in these experiments.