# Large time-asymmetric quantum fluctuations in amplitude-intensity correlation measurements of a V-type three-level atom resonance fluorescence

## TL;DR

This paper demonstrates that a bichromatically driven V-type three-level atom's resonance fluorescence exhibits significant time-asymmetry and violations of classical bounds in amplitude-intensity correlations due to noncommuting operators and non-Gaussian fluctuations.

## Contribution

It reveals large time-asymmetric quantum fluctuations in amplitude-intensity correlations, highlighting nonclassical features beyond second-order measures in a V-type atom system.

## Key findings

- Asymmetry and violation of classical bounds in correlations
- Large third-order fluctuations reveal nonclassicality
- Enhanced understanding of resonance fluorescence fluctuations

## Abstract

In this paper we show that the scattered field of a bichromatically driven V-type three-level atom exhibit asymmetry and large violation of classical bounds in amplitude-intensity correlations. These features result from the noncommutativity of amplitude and intensity field operators, and the strong non-Gaussian fluctuations in this system. The amplitude-intensity correlations of resonance fluorescence, with its large third-order fluctuations, describe the nonclassical features of the emitted field more accurately than the second-order measure related to squeezing. Spectra and variances of these correlations, along intensity-intensity correlations, provide a wealth of supporting information.