Polarization-entangled photon pair source using beam displacers and thin crystals

TL;DR

This paper reports an experimental polarization-entangled photon pair source using beam displacers and thin crystals, achieving high fidelity and enabling applications in quantum imaging with many spatial modes.

Contribution

The work demonstrates a novel entangled photon source with high fidelity and a large number of spatial modes, suitable for quantum imaging applications.

Findings

State fidelity of 0.975±0.004 achieved

Violates CHSH inequality with S=2.75±0.01

Produces approximately 550 spatial modes

Abstract

We present an experimental implementation of a polarization-entangled photon pair source based on beam displacers. The down-converted photons are emitted via spontaneous parametric down-conversion in a non-degenerate and type-0 process. We obtain a state fidelity of $F=0.975\pm0.004$ and violate a Clauser-Horne-Shimony-Holt inequality with $S=2.75\pm0.01$. Our source also uses thin crystals for applications in quantum imaging, taking advantage of the large number of spatial modes. We estimate that our source could produce 550$\pm$12 spatial modes.