Design Of A Spontaneous Parametric Down-Conversion Photon Pair Source In A Heterogeneously Integrated Silicon Photonic/Lithium Niobate Platform

Spontaneous Parametric Down Conversion (SPDC) is a nonlinear photonic process used to produce entangled pairs of photons when supplied with a pump photon source. In this work, wafer bonding of LiNbO₃ onto silicon photonic wafers is utilized to design Type-0 degenerate SPDC entangled photon pair sources. By detecting one of the photons in the pair, we can herald the existence of the second photon. This thus provides a heralded single photon source, a key building block needed to generate Bell states for quantum logic [1].

[1] - Seshadri, S., Lu, H.-H., Leaird, D. E., Weiner, A. M., Lukens, J. M. (2022). Complete Frequency-Bin Bell Basis Synthesizer. Physical Review Letters, 129. https://doi.org/10.1103/physrevlett.129.230505



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