Efficient excitation of a symmetric collective atomic state with a single-photon through dipole blockade

TL;DR

This paper demonstrates a method to efficiently generate a symmetric collective atomic state with a single photon using dipole blockade, significantly improving success probability in quantum communication schemes.

Contribution

The study introduces a technique leveraging dipole blockade to excite a mesoscopic atomic ensemble into a single-excitation state with near-unity success probability, surpassing previous limitations.

Findings

Near-unity success probability for single-photon excitation

Suppression of higher-order excitations in atomic ensembles

Enhanced efficiency in quantum communication protocols

Abstract

In the famous quantum communication scheme developed by Duan {\it et al.}[L.M. Duan, M.D. Lukin, J.I. Cirac, and P. Zoller, Nature (London) {\bf 414} 413 (2001)], the probability of successful generating a symmetric collective atomic state with a single-photon emitted have to be far smaller than 1 to obtain an acceptable entangled state. Because of strong dipole-dipole interaction between two Rydberg atoms, more than one simultaneous excitations in an atomic ensembles are greatly suppressed, which makes it possible to excite a mesoscopic cold atomic ensemble into a singly-excited symmetric collective state accompanied by a signal photon with near unity success probability, at the same higher-order excitations can be significantly inhibited.