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  • Title: Design of spontaneous parametric down-conversion in integrated hybrid SixNy-PPLN waveguides.
    Author: Cheng X, Sarihan MC, Chang KC, Lee YS, Laudenbach F, Ye H, Yu Z, Wong CW.
    Journal: Opt Express; 2019 Oct 14; 27(21):30773-30787. PubMed ID: 31684320.
    Abstract:
    High-efficient and high-purity photon sources are highly desired for quantum information processing. We report the design of a chip-scale hybrid SixNy and thin film periodically-poled lithium niobate waveguide for generating high-purity type-II spontaneous parametric down-conversion (SPDC) photons in the telecommunication band. The modeled second harmonic generation efficiency of 225% W-1 • cm-2 is obtained at 1560nm. Joint spectral analysis is performed to estimate the frequency correlation of SPDC photons, yielding intrinsic purity with up to 95.17%. The generation rate of these high-purity photon pairs is estimated to be 2.87 × 107 pairs/s/mW within the bandwidth of SPDC. Our chip-scale hybrid waveguide design has the potential for large-scale on-chip quantum information processing and integrated photon-efficient quantum key distribution through high-dimensional time-energy encoding.
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