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Entangled photons from the polariton vacuum in a switchable optical cavity

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2012

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http://nbn-resolving.de/urn:nbn:de:bsz:352-227235
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https://doi.org/10.1103/PhysRevB.85.235140
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Physical Review B. 2012, 85(23). ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.85.235140

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We study theoretically the entanglement of two-photon states in the ground state of the intersubband cavity system, i.e., 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 postselection 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 postselection.

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ISO 690AUER, Adrian, Guido BURKARD, 2012. Entangled photons from the polariton vacuum in a switchable optical cavity. In: Physical Review B. 2012, 85(23). ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.85.235140
BibTex
@article{Auer2012Entan-22723,
  year={2012},
  doi={10.1103/PhysRevB.85.235140},
  title={Entangled photons from the polariton vacuum in a switchable optical cavity},
  number={23},
  volume={85},
  issn={1098-0121},
  journal={Physical Review B},
  author={Auer, Adrian and Burkard, Guido}
}
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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, i.e., 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 postselection 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 postselection.</dcterms:abstract>
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