Single-mode Quantum Non-Gaussian Light from Warm Atoms

TL;DR

This paper demonstrates the generation of quantum non-Gaussian light from warm atoms using a single-mode spontaneous four-wave mixing process, overcoming decoherence effects and enabling quantum information applications.

Contribution

It introduces a method to produce provably quantum non-Gaussian light from warm atomic ensembles in a single-mode regime, despite thermal decoherence.

Findings

Successful generation of QNG light from warm atoms.

High spectral bandwidth and low absorption enable direct observability.

Heralded QNG light achieved despite decoherence effects.

Abstract

The distributed quantum information processing and hybridization of quantum platforms raises increasing demands on the quality of light-matter interaction and realization of efficient quantum interfaces. This becomes particularly challenging for needed states possessing fundamental quantum non-Gaussian (QNG) aspects. They correspond to paramount resources in most potent applications of quantum technologies. We demonstrate the generation of light with provably QNG features from a tunable warm atomic ensemble in a single-mode regime. The light is generated in a spontaneous four-wave mixing process in the presence of decoherence effects caused by a large atomic thermal motion. Despite its high sensitivity to any excess noise, a direct observability of heralded QNG light could be achieved due to a combination of a fast resonant excitation, large spectral bandwidth, and a low absorption loss of resonant photons guaranteed by the source geometry.