Atom-atom entanglement generated at early times by two photon emission

TL;DR

This paper investigates how two initially excited atoms become entangled through their interaction with the electromagnetic field, analyzing the effects of photon emission timing and interatomic distance on entanglement formation.

Contribution

It provides a detailed analysis of atom-atom entanglement generated at early times via two-photon emission, considering different field states and their influence on entanglement.

Findings

Entanglement can be generated when the field state is known.

Entanglement depends on time and interatomic distance.

Photon emission timing influences entanglement dynamics.

Abstract

We analyze entanglement generation between a pair of neutral two level atoms that are initially excited in a common electromagnetic vacuum. The nonlocal correlations that appear due to the interaction with the field can become entanglement when the field state is known. We distinguish two different situations: in the first, the field remains in the vacuum state, and second two photons are present in the final state. In both cases we study the dependence of the entanglement with time and interatomic distance, at ranges related with locality issues.