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

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 downconversion in a non-degenerate and type-0 process. We obtain a state fidelity of F = 0.975 ± 0.004 and violate a Cl...

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Bibliographic Details
Published in:Optics letters 2024-10, Vol.49 (19), p.5467
Main Authors: Hong, Minjae, Gómez, Rodrigo, Flavio Gili, Valerio, Fuenzalida, Jorge, Gräfe, Markus
Format: Article
Language:English
Subjects:
Photon beams
Photons
Polarization
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Summary: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 downconversion in a non-degenerate and type-0 process. We obtain a state fidelity of F = 0.975 ± 0.004 and violate a Clauser-Horne-Shimony-Holt (CHSH) inequality with $\mathcal {S}=2.75\pm 0.01$. 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 ± 12 spatial modes.
ISSN:0146-9592
1539-4794
1539-4794
DOI:10.1364/OL.536820