Strongly entangled light from planar microcavities

TL;DR

This paper investigates the generation and quantification of strongly entangled photon pairs emitted from planar microcavities, highlighting the effects of phase-matching, external coupling, and dephasing on entanglement quality.

Contribution

It introduces a method to analyze and quantify entanglement in microcavity emission using Schmidt number witnesses, considering dephasing effects.

Findings

Strong bipartite entanglement achieved in microcavity emission

Schmidt number effectively quantifies entanglement resources

Dephasing reduces entanglement in propagation channels

Abstract

The emission of entangled light from planar semiconductor microcavities is studied and the entanglement properties are analyzed and quantified. Phase-matching of the intra-cavity scattering dynamics for multiple pump beams or pulses, together with the coupling to external radiation, leads to the emission of a manifold of entangled photon pairs. A decomposition of the emitted photons into two parties leads to a strong entanglement of the resulting bipartite system. For the quantification of the entanglement, the Schmidt number of the system is determined by the construction of Schmidt number witnesses. It is analyzed to which extend the resources of the originally strongly entangled light field are diminished by dephasing in propagation channels.