Photon statistics on the extreme entanglement

TL;DR

This paper explores the relationship between photon statistics and two-atom entanglement in a cavity QED system, revealing that optimal photon bunching and antibunching correspond to maximal entanglement under certain conditions.

Contribution

It demonstrates a direct connection between photon statistics and two-atom entanglement, providing a physical understanding of their relationship in cavity QED.

Findings

Maximal two-atom entanglement aligns with optimal photon antibunching and bunching.

Photon statistics can serve as indicators of entanglement in cavity systems.

Strong dissipation and dephasing influence the entanglement-photon statistics relationship.

Abstract

The effects of photon bunching and antibunching correspond to the classical and quantum features of the electromagnetic field, respectively. No direct evidence suggests whether these effects can be potentially related to quantum entanglement. Here we design a cavity quantum electrodynamics model with two atoms trapped in to demonstrate the connections between the steady-state photon statistics and the two-atom entanglement . It is found that within the weak dissipations and to some good approximation, the local maximal two-atom entanglements perfectly correspond to not only the quantum feature of the electromagnetic field---the optimal photon antibunching, but also the classical feature---the optimal photon bunching. We also analyze the influence of strong dissipations and pure dephasing. An intuitive physical understanding is also given finally.