Entanglement in atomic resonance fluorescence

TL;DR

This paper demonstrates that atomic resonance fluorescence can serve as a continuous, robust source of non-Gaussian entangled radiation in two directions, with potential applications in quantum information processing.

Contribution

It reveals that resonance fluorescence from atoms produces non-Gaussian entangled light, with enhanced robustness against dephasing compared to squeezing, and extends understanding from single to multiple atoms.

Findings

Single atom entanglement occurs under squeezing conditions

Multi-atom entanglement is more robust against dephasing

Resonance fluorescence provides a continuous entangled radiation source

Abstract

The resonance fluorescence from regular atomic systems is shown to represent a continuous source of non-Gaussian entangled radiation propagating in two different directions. For a single atom entanglement occurs under the same conditions as squeezing. For more atoms, the entanglement can be more robust against dephasing than squeezing, hence providing a useful continuous source for various applications of entangled radiation.