Experimental entangled photon pair generation using crystals with parallel optical axes

Abstract

We present an optical design where polarization-entangled photon pairs are generated within two $\beta$-Barium Borate crystals whose optical axes are parallel. This design increases the spatial mode overlap of the emitted photon pairs enhancing single mode collection without the need for additional spatial walk-off compensators. The observed photon pair rate is at least 65000 pairs/s/mW with a quantum state fidelity of 99.53$\pm$0.22% when pumped with an elliptical spatial profile.

5 pages, 4 figures

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• Experimental conversion of position correlation into polarization entanglement
• Fano-control of down-conversion in a nonlinear crystal embedded with plasmonic-quantum emitter hybrid structures
• Extended Source of Indistinguishable Polarization-entangled Photons over Wide Angles of Emission
• Enhancing SPDC brightness using elliptical pump shapes
• Compact and stable source of polarization-entangled photon-pairs based on a folded linear displacement interferometer
• Highly nondegenerate polarization-entangled photon pairs produced through noncritical phasematching in single-domain KTiOPO${}_4$
• Enhanced spontaneous down-conversion in a nonlinear crystal embedded with plasmonic-quantum emitter hybrid structures