Development of a heralded photon source with the advantage of multiphoton reduction for improved quantum key distribution

Ling Hui Zhou, Zhenhua Li, Jipeng Wang +3 more

Tomoyuki Horikiri, Yuishi Takeno, Hideki Sasaki +3 more

Tomoyuki Horikiri, Yuishi Takeno, Atsushi Yabushita +1 more

We have suppressed multiphoton probability of a heralded-photon source, which is vital for quantum key distribution with a higher secure key generation rate. It is accomplished by utilizing a practical photon-number-resolving detector for triggering resulting in an important step for improved practical quantum key distribution. Heralded-photon source and a practical photon-number-resolving detector capable of real-time processed multiphoton rejection are stably operable at room temperature and enable us to generate a secure key at a distance as long as an ideal single photon source is used.

Xiaopeng Liu, Jia-Le Kang, Jiahui Xie +1 more

Yu Feng, Seounghun Lee, Semin Kim +2 more

In practical quantum key distribution (QKD) systems, the heralded single photon source (HSPS) based on parametric down-conversion (PDC) has attracted significant attentions from many researchers because its various advantages compared to the weak coherent source. We propose a heralded single photon source-based decoy-state QKD with dual detectors and demonstrate in a theoretical simulation that this method improves the performance of QKD system. The secure key generation rate is increased significantly with our proposal both in thermal and Poisson distributions of photons. The secure key rate produced by our scheme is higher than the state of the art key rate of current high-speed QKD system. The decoy-state QKD system using the heralded single photon source with dual detectors can be an important alternative for the present practical QKD systems.

Fen Zhou, Wenxiu Qu, Jipeng Wang +6 more