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We demonstrate a method to generate entangled photons with controlled spatialshape by parametric down conversion (PDC) in a 2D nonlinear crystal. A compactand novel crystal source was designed and fabricated, generating directly pathentangled photons without the use of additional beam-splitters. This crystalsupports two PDC processes, emitting biphotons into two beamlike modessimultaneously. Two coherent path entangled amplitudes of biphotons werecreated and their interference observed. Our method enables the generation ofentangled photons with controlled spatial, spectral and polarizationproperties.

Compact 2D Nonlinear Photonic Crystal Source of Beamlike Path Entangled Photons