abstract:Decoy state Quantum key distribution (QKD) protocol is proposed to solve the multi-photon issue in QKD source. In QKD protocols, such as BB84, a single photon source is assumed to be used by the sender, Alice.
So in this paper, the optimal situation of the decoystate protocol applied to the QKD system with heralded single photon source (HSPS) is complemented and extended.