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 summariz...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.展开更多
基金the National Key Research and Development Program of China(Grant Nos.2018YFA0306400 and 2017YFA0304100)the National Natural Science Foundation of China(Grant Nos.12074194,11774180,and U19A2075)the Leading-edge Technology Program of Jiangsu Natural Science Foundation,China(Grant No.BK20192001)。
文摘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.
