Heralded single photon source (HSPS) is an important way in generating genuine single photon, having advantages of experimental simplicity and versatility. However, HSPS intrinsically suffers from the trade-off between the heralded single photon rate and the single photon purity. To overcome this, one can apply multiplexing technology in different degrees of freedom to enhance the performance of HSPS. Here, by employing spectral multiplexing and active feed-forward spectral manipulating, we demonstrate a HSPS at 1.5 {\mu}m telecom-band. Our experimental results show that the spectral multiplexing effectively erases the frequency correlation of pair source and significantly improves the heralded single photon rate while keeping the g{^(^2^)}(0) as low as 0.0006{\pm}0.0001. The Hong-Ou-Mandel interference between the heralded single photons and photons from an independent weak coherent source indicates a high indistinguishability. Our results pave a way for scalable HSPS by spectral multiplexing towards deterministic single photon emission.
@article{arxiv.2104.02593,
title = {Spectrally multiplexed heralded single photon source at telecom-band},
author = {Hao Yu and Chenzhi Yuan and Ruiming Zhang and Zichang Zhang and Hao Li and You Wang and Guangwei Deng and Lixing You and Haizhi Song and Zhiming Wang and Guang-Can Guo and Qiang Zhou},
journal= {arXiv preprint arXiv:2104.02593},
year = {2022}
}