Decoy-state theory for the heralded single-photon source with intensity fluctuations
Shuang Wang, ShengLi Zhang, Hong-Wei Li, Zhen−Qiang Yin, Yibo Zhao, Wei Chen, Zheng‐Fu Han, Guang‐Can Guo · Physical Review A · 2009
The secure key rates of decoy-state quantum key distribution (QKD) using the heralded single-photon source (HSPS) are recalculated in the case of intensity fluctuations. By numerical simulations, we show that the HSPS is a good source for decoy-state QKD experiments not only because it has larger upper bound of transmission distance than the usual weak-coherent source (WCS) but also because it is more robust against intensity fluctuations than the WCS.