@unpublished{Auer2011Entan-19242,
  year={2011},
  title={Entangled photons from the polariton vacuum in a switchable optical cavity},
  author={Auer, Adrian and Burkard, Guido},
  note={PDF auf arxiv-Server}
}

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    <dcterms:abstract xml:lang="eng">We study theoretically the entanglement of two-photon states in the ground state of the intersubband cavity system, the so-called polariton vacuum. The system consists of a sequence of doped quantum wells located inside a microcavity and the photons can interact with intersubband excitations inside the quantum wells. Using an explicit solution for the ground state of the system, operated in the ultrastrong coupling regime, a post-selection is introduced, where only certain two-photon states are considered and analyzed for mode entanglement. We find that a fast quench of the coupling creates entangled photons and that the degree of entanglement depends on the absolute values of the in-plane wave vectors of the photons. Maximally entangled states can be generated by choosing the appropriate modes in the post-selection.</dcterms:abstract>
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