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In our recent Physical Review Letters paper we demonstrate a novel detection scheme that provides a practical way of characterising entanglement for quantum communication networks. On the theory side, we devised a new witness of entanglement that is robust as well as scalable, meaning that it can be implemented in any number of parties, i.e. complex quantum networks. Experimentally we tested our witness for two and three parties, with different losses and with different degree of entanglement.…

In our letter published in Nature Photonics we have demonstrated quantum key distribution (QKD) over 307 km. The research has also been highlighted by several local newspapers, including Tribune de Genève. This is the first time that such a distance has been achieved, whilst maintaining a quantifiable security measure of the whole protocol. That is to say, we can quantify the probability of an unwanted person learning part of the secret key. In our case, the probability of this happening was…