Gigahertz decoy quantum key distribution with 1 Mbit/s secure key rate.
We report the first gigahertz clocked decoy-protocol quantum key distribution (QKD). Record key rates have been achieved thanks to the use of self-differencing InGaAs avalanche photodiodes designed specifically for high speed single photon detection. The system is characterized with a secure key rate of 1.02 Mbit/s for a fiber distance of 20 km and 10.1 kbit/s for 100 km. As the present advance relies upon compact non-cryogenic detectors, it opens the door towards practical and low cost QKD systems to secure broadband communication in future.
Dixon
A R
AR
Toshiba Research Europe Ltd, Cambridge Research Laboratory, Cambridge, UK.
Yuan
Z L
ZL
Dynes
J F
JF
Sharpe
A W
AW
Shields
A J
AJ
D003195:Computer Communication Networks / Q000295:instrumentation*; D016494:Computer Security / Q000295:instrumentation*; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008872:Microwaves; D011789:Quantum Theory; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*