A continuous-variable formalism for the Faraday atom-light interface
Abstract
Quantum interfaces between polarized atomic ensembles and coherent states of light, applied recently to manipulate bipartite and multipartite entanglement, are revisited by means of a continuous-variable formalism. The explicit use of the continuous-variable formalism facilitates significantly the analysis of entanglement between different modes, reducing it to the study of the properties of a final covariance matrix which can be found analytically. Furthermore, it allows to study matter-light interfaces for mixed states, adapting the formalism to the experimental situations in which the initial prepared Gaussian states are, unavoidably, affected by a certain amount of noise. A multipartite scenario, leading to the generation of macroscopic cluster states is presented and analyzed in detail within this formalism.
Cite
@article{arxiv.1007.0403,
title = {A continuous-variable formalism for the Faraday atom-light interface},
author = {Julia Stasińska and Simone Paganelli and Carles Rodó and Anna Sanpera},
journal= {arXiv preprint arXiv:1007.0403},
year = {2011}
}