Direct production of tripartite pump-signal-idler entanglement in the above-threshold optical parametric oscillator.

@article{Villar2006DirectPO,
  title={Direct production of tripartite pump-signal-idler entanglement in the above-threshold optical parametric oscillator.},
  author={Alessandro S. Villar and Marcelo Martinelli and Claude Fabre and Paulo A. Nussenzveig},
  journal={Physical review letters},
  year={2006},
  volume={97 14},
  pages={
          140504
        }
}
We calculate the quantum correlations existing among the three output fields (pump, signal, and idler) of a triply resonant nondegenerate optical parametric oscillator operating above threshold. By applying the standard criteria [P. van Loock and A. Furusawa, Phys. Rev. A 67, 052315 (2003)], we show that strong tripartite continuous-variable entanglement is present in this well-known and simple system. Furthermore, since the entanglement is generated directly from a nonlinear process, the three… 

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    It should be noted, however, that such proposals may lead to even higher orders of entanglement, if the pump mode is taken into account