Nov 6, 2018, 10:00 AM
Our recent demonstration of a secret key exchange over a record distance of 421 km of optical fibre has been published in PRL as an Editor's suggestion as well as being featured in Physics Viewpoint. We push the limits to new heights by optimising all parts of the QKD system including increasing the generation rate of the quantum states to reach 2.5 GHz and high performance single-photon detectors developed in-house, which have very high efficiency and low noise. Finally, a new encoding method…