Tailoring polarization entanglement in anisotropy-compensated SPDC

TL;DR

This paper demonstrates a method to engineer and tailor polarization entangled states in type-II SPDC by generalizing transverse walk-off compensation, enabling a richer set of entangled photon states.

Contribution

The authors introduce a generalized approach to polarization entanglement engineering in anisotropy-compensated SPDC, expanding the variety of achievable entangled states.

Findings

Angular spectrum contains a continuum of maximally entangled states

Polarization entangled states can be effectively engineered

Method enriches the set of generated entangled states

Abstract

We show that the angular spectrum of type-II SPDC contains a continuum of maximally entangled states. For the realization of a bright source of entangled two-photon states, a standard technique is to compensate for the transverse walk-off in the production crystal. We demonstrate that polarization entangled states can be effectively engineered by generalizing this approach. Our method allows to considerably enrich the set of generated entangled states with a controlled tailoring them.