Simulating single-photon sources based on backward-wave spontaneous parametric down-conversion in a periodically poled KTP waveguide

18th International Youth Scientific School "Coherent Optics and Optical Spectroscopy"

Shukhin, A.A.^1 ; Akatiev, D.O.^2 ; Latypov, I.Z.^1 ; Shkalikov, A.V.^1 ; Kalachev, A.A.^1,2

Zavoisky Physical-Technical Institute, 10/7, Sibirsky tract str., Kazan

420029, Russia^1

Kazan Federal University, Kremlevskaya str., 18, Kazan

420008, Russia^2

关键词: Effective index of refraction;    Heralded photons;    Periodically poled;    Periodically poled KTP;    Single photon state;    Single-photon source;    Spectral narrowing;    Spontaneous parametric down conversion;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/613/1/012015/pdf
DOI  :  10.1088/1742-6596/613/1/012015

来源: IOP

【 摘 要 】

The properties of the backward-wave spontaneous parametric down-conversion (SPDC) in a periodically poled potassium titanyl phosphate (KTP) waveguide are studied in the context of creating narrowband heralded sources of single-photon states. The effective index of refraction and spatial profile of different waveguide modes, efficiency of different SPDC processes and purity of heralded photons are calculated numerically for a given waveguide. Compared to the usual co-propagating SPDC, spectral narrowing of the backward- wave SPDC was observed as should be expected.