Entangled photons from the polariton vacuum in a switchable optical cavity

Details Entangled photons from the polariton vacuum in a switchable optical cavity Entangled photons from the polariton vacuum in a switchable optical cavity

2011-12-14

arxiv.org/abs/1112.3211v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9+ pages, 7 figures

Scientific paper

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.

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