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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…