Rubidium-Doped KTiOPO${}_4$ Waveguides as a Dual-Type Photon Pair Source

Abstract

We investigate the dual generation of type-0 and type-II spontaneous parametric down conversions (SPDCs) within a single periodically poled rubidium-doped KTiOPO${}_4$ (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 $d_{33}$ , while the type-II SPDC process employs first-order QPM with the nonlinear coefficient $d_{24}$. This dual-SPDC scheme holds potential for applications in quantum communication protocols targeting the telecommunication wavelength.

8 pages, 4 figures

References in corpus (7)

• Entangled photon-pair generation in periodically-poled thin-film lithium niobate waveguides
• Ultra-bright entangled-photon pair generation from an AlGaAs-on-insulator microring resonator
• Multipartite continuous-variable entanglement from concurrent nonlinearities
• High-performance source of spectrally pure, polarization entangled photon pairs based on hybrid integrated-bulk optics
• Direct Measurement of the Spatial-Spectral Structure of Waveguided Parametric Down-Conversion
• Towards metropolitan free-space quantum networks
• Quasiphasematched concurrent nonlinearities in periodically poled KTiOPO_4 for quantum computing over the optical frequency comb