# Conditional nonclassical field generation in cavity QED

## TL;DR

This paper presents a method for generating nonclassical light states in a cavity by conditioning on atomic detection events, demonstrating properties like squeezing, sub-Poissonian statistics, and negative Wigner functions.

## Contribution

The authors propose a novel conditional scheme for nonclassical state generation in cavity QED using atomic detection, with detailed characterization of quantum properties.

## Key findings

- Nonclassical states exhibit quadrature squeezing.
- Photon-number distributions are sub-Poissonian.
- Wigner functions show negativity indicating nonclassicality.

## Abstract

We introduce a method for the conditional generation of nonclassical states of light in a cavity. We consider two-level atoms traveling along the transverse direction to the cavity axis and show that by conditioning on one of the output measurements nonclassical field states are generated. The two-level atoms are prepared in the ground state and we conditioned on the events in which they are also detected in the ground state. Nonclassical properties of the cavity mode are identified and characterized. This includes: quadrature squeezing, sub-Poissonian photon-number distributions, and negative Wigner functions. We determine the optimal parameter regions where the corresponding nonclassical features are most distinct.