Simulating Single-Photon Sources Based on Backward-Wave Spontaneous Parametric Down-Conversion in a Periodically Poled KTP WaveguideA.A. Shukhin, I.Z. Latypov, A.V. Shkalikov and A.A. KalachevEPJ Web of Conferences, 103 (2015) 10009DOI: https://doi.org/10.1051/epjconf/201510310009