Three-Color Entanglement

@article{Coelho2009ThreeColorE,
  title={Three-Color Entanglement},
  author={Antonio S. Coelho and Felippe A. S. Barbosa and Katiuscia Nadyne Cassemiro and Alessandro S. Villar and Marcelo Martinelli and Paulo A. Nussenzveig},
  journal={Science},
  year={2009},
  volume={326},
  pages={823 - 826}
}
Entangling Rainbows Quantum mechanical entanglement is at the heart of quantum information processing. In the future, practical systems will contain a network of quantum components, possibly operating at different frequencies. Coelho et al. (p. 823, published online 17 September) present a technique that can entangle light beams of three different frequencies. The ability to swap entanglement between different light fields should prove useful in advanced quantum information protocols on systems… 

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