> In contrast to earlier approaches, the implemented protocol, which was developed by researchers at NUS, uses two measurement settings for key generation inste

> In contrast to earlier approaches, the implemented protocol, which was developed by researchers at NUS, uses two measurement settings for key generation instead of one: “By introducing the additional setting for key generation, it becomes more difficult to intercept information, and therefore the protocol can tolerate more noise and generate secret keys even for lower-quality entangled states,” says Charles Lim. With conventional QKD methods, by contrast, security is guaranteed only when the quantum devices used have been characterized sufficiently well. “And so, users of such protocols have to rely on the specifications furnished by the QKD providers and trust that the device will not switch into another operating mode during the key distribution,” explains Tim van Leent, one of the four lead authors of the paper alongside Wei Zhang, Robert Garthoff and Kai Redeker. It has been known for at least a decade that older QKD devices could easily be hacked from outside, continues van Leent. https://www.lmu.de/en/newsroom/news-overview/news/quantum-cryptography-hacking-futile.html https://www.lmu.de/en/newsroom/news-overview/news/quantum-cr...