Quantum non-Gaussianity from a large ensemble of single photon emitters

TL;DR

This paper demonstrates that quantum non-Gaussianity, a key quantum property for advanced protocols, can be observed in light emitted from many single photon emitters even with significant optical losses, surpassing limitations of Wigner negativity.

Contribution

It introduces a hierarchy of criteria for quantum non-Gaussianity and predicts its observability in realistic multi-emitter light sources with high optical losses.

Findings

Quantum non-Gaussianity can be observed in multi-emitter light despite losses.

The hierarchy of criteria enables detection beyond Wigner negativity limits.

Light from many emitters exhibits quantum non-Gaussianity under realistic conditions.

Abstract

Quantum attributes of light have been related to non-classicality so far, i. e. to incompatibility with mixtures of coherent states. The progress in quantum optics indicates that this feature does not suffice to witness exotic behavior of light. Contrary, quantum non-Gaussianity is starting to appear as a promising and applicable property reflecting interesting states of light that are suitable for quantum protocols. We investigate a newly introduced hierarchy of criteria of quantum non-Gaussianity and predict this attribute can be observed on light emitted from many single photon emitters, even if the light undergoes realistic optical losses. It contrasts negativity of Wigner function, that is unreachable in experimental platforms with losses above fifty percent.