A continuous-variable formalism for the Faraday atom-light interface

Details A continuous-variable formalism for the Faraday atom-light interface A continuous-variable formalism for the Faraday atom-light interface

2010-07-02

arxiv.org/abs/1007.0403v3

Physics

Quantum Physics

Scientific paper

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.

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