Dark Entangled Steady States of Interacting Rydberg Atoms

TL;DR

This paper introduces a fast, dissipative method to generate high-fidelity entangled steady states between two Rydberg atoms using a two-photon excitation process, dark state interference, and spontaneous emission.

Contribution

It presents a novel scheme for rapid entanglement generation that is robust over a wide range of physical parameters and weakly dependent on Rydberg interaction strength.

Findings

Entangled steady states form quickly under various parameters.

The process relies on dark state interference and spontaneous emission.

Time scale depends mainly on Raman and Rabi field strengths.

Abstract

We propose a scheme for rapid generation of high fidelity steady state entanglement between a pair of atoms. A two-photon excitation process towards long-lived Rydberg states with finite pairwise interaction, a dark state interference effect in the individual atoms, and spontaneous emission from their short-lived excited states lead to rapid, dissipative formation of an entangled steady state. We show that for a wide range of physical parameters, this entangled state is formed on a time scale given by the strengths of coherent Raman and Rabi fields applied to the atoms, while it is only weakly dependent on the Rydberg interaction strength.