%A Jing Wang(王静), Chun-Hui Zhang(张春辉), Jing-Yang Liu(刘靖阳), Xue-Rui Qian(钱雪瑞), Jian Li(李剑), and Qin Wang(王琴) %T Improving the purity of heralded single-photon sources through spontaneous parametric down-conversion process %0 Journal Article %D 2021 %J Chin. Phys. B %R 10.1088/1674-1056/abfb5c %P 70304-070304 %V 30 %N 7 %U {https://cpb.iphy.ac.cn/CN/abstract/article_123671.shtml} %8 2021-06-22 %X The high-purity single-photon source plays an important role in the field of quantum information. Usually, it is generated through spontaneous parametric down-conversion process. In this paper, we investigate and summarize a few approaches on obtaining single-photon sources with a high purity using either PPKTP or PPLN nonlinear crystals. Moreover, we present improved schemes to increase the purity based on existing work, corresponding applicable conditions and procedures are discussed and analyzed. Besides, we carry out numerical simulations and show that nearly perfect purity can be reached even without using any filters. Therefore, this work might provide valuable references for the generation and application of high purity single-photon sources.