Retrieval of multiple spin waves from a weakly excited, metastable atomic ensemble

TL;DR

This paper investigates how multiply excited atomic ensembles emit light, revealing the spatial separation of symmetric and non-symmetric spin-wave states, with implications for single photon sources and entanglement.

Contribution

It demonstrates the spatially distinct emission of symmetric and non-symmetric spin-wave states in atomic ensembles, advancing understanding of light-matter interactions for quantum applications.

Findings

Symmetric and non-symmetric states emit into separate spatial modes.

Atomic interactions enable isolated single photon emission.

Potential for spin wave entanglement and quantum communication.

Abstract

The emission of light from a multiply excited atomic ensemble is examined and it is shown how symmetric (spin-wave) and non-symmetric states of excitation radiate into spatially separate field modes. This observation has potential application to single photon generation and spin wave entanglement, since in the presence of atomic interactions it can result in isolated single photon emission into a phase-matched field mode.