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Rio De La Plata Workshop on Laser Dynamics and Nonlinear Photonics

Entanglement among bright light beams: Creation, structure, sudden death

Alessandro S. Villar, F. A. S. Barbosa, A. S. Coelho, K. N. Cassemiro, M. Martinelli, P. Nussenzveig

Published Dec 1, 2011• 0 citations
Publisher

Abstract

The possibility to generate multipartite entanglement in the laboratory allows further investigations of the structure of quantum correlations among many parties. We employ the optical parametric oscillator to directly produce three entangled bright beams of light and study their properties. In this tripartite continuous system, we observe a mixture of behaviours common to discrete systems pertaining to both the GHZ and the W classes of tripartite entangled states.

DOI
10.1109/ldnp.2011.6162083

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The possibility to generate multipartite entanglement in the laboratory allows further investigations of the structure of quantum correlations among many parties. We employ the optical parametric oscillator to directly produce three entangled bright beams of light and study their properties. In this tripartite continuous system, we observe a mixture of behaviours common to discrete systems pertaining to both the GHZ and the W classes of tripartite entangled states.
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The multipartite polarization entangled states of bright optical beams directly associating with the spin states of atomic ensembles are one of the essential resources in the future quantum information networks, which can be conveniently utilized to transfer and convert quantum states across a network composed of many atomic nodes. In this letter, we present the experimental demonstration of tripartite polarization entanglement described by Stokes operators of optical field. The tripartite entangled states of light at the frequency resonant with D1 line of Rubidium atoms are transformed into the continuous variable polarization entanglement among three bright optical beams via an optical beam splitter network. The obtained entanglement is confirmed by the extended criterion for polarization entanglement of multipartite quantized optical modes.