Rubidium-Doped KTiOPO₄ Waveguides as a Dual-Type Photon Pair Source

2025/05/20 by Hendra, Patrick, León-Torres, Josué R., Gili, Valerio Flavio +1
#FOS: Physical sciences #Optics (physics.optics) #Quantum Physics (quant-ph)

paper · doi:10.48550/arxiv.2505.14269

Abstract

We investigate the dual generation of type-0 and type-II spontaneous parametric down conversions (SPDCs) within a single periodically poled rubidium-doped KTiOPO₄ (PPRKTP) waveguide. By coupling a 45 degree linearly polarized pump laser into the waveguide, both SPDC processes are concurrently excited: the type-0 SPDC process is facilitated via third-order quasi-phase matching (QPM) utilizing the nonlinear coefficient d₃₃ , while the type-II SPDC process employs first-order QPM with the nonlinear coefficient d₂₄. This dual-SPDC scheme holds potential for applications in quantum communication protocols targeting the telecommunication wavelength.

Citations

• Highly nondegenerate polarization-entangled photon pairs produced through noncritical phasematching in single-domain KTiOPO₄
• Efficient parametric frequency conversions in lithium niobate nanophotonic chips

Related

• Semi-classical modelling of second-order spontaneous down-conversion measured over 10 decades of pump intensity in a type II phase-matched KTP crystal
• Highly nondegenerate polarization-entangled photon pairs produced through noncritical phasematching in single-domain KTiOPO₄
• Telecom-band Multi-Type Spontaneous Parametric Downconversion in Periodically Polarized Nonlinear Materials
• Generation of spectrally factorable photon pairs via multi-order quasi-phase-matched spontaneous parametric downconversion
• Joint spectral amplitude analysis of SPDC photon pairs in a multimode ppLN ridge waveguide