Tunable Entanglement, Antibunching and Saturation effects in Dipole Blockade

TL;DR

This paper presents a model analyzing the dipole blockade effect in a two-atom system, demonstrating tunable entanglement, methods to lift the blockade, and potential for monitoring via photon correlations.

Contribution

It introduces a quantitative model for dipole blockade, showing how entanglement can be controlled and how to manipulate and monitor blockade effects.

Findings

Large concurrence achievable in the blockade regime

Entanglement tunable by laser intensity

Possible control and monitoring of blockade effects

Abstract

We report a model that makes it possible to analyze quantitatively the dipole blockade effect on the dynamical evolution of a two two-level atom system driven by an external laser field. The multiple excitations of the atomic sample are taken into account. We find very large concurrence in the dipole blockade regime. We further find that entanglement can be tuned by changing the intensity of the exciting laser. We also report a way to lift the dipole blockade paving the way to manipulate in a controllable way the blockade effects. We finally report how a continuous monitoring of the dipole blockade would be possible using photon-photon correlations of the scattered light in a regime where the spontaneous emission would dominate dissipation in the sample.