Quantum key distribution over a 60-dB channel loss using SSPD with ultralow dark count rate
Hiroyuki Shibata, Toshimori Honjo, Kaoru Shimizu · 2013
We present the first quantum key distribution (QKD) experiment over 60 dB channel loss, which is equivalent to 300 km of fiber. We use the differential phase shift QKD protocol and ultra-low dark count SSPDs.