Satellites could keep your secrets safe in space

时间:2019-03-02 08:05:01166网络整理admin

It is a quantum leap of sorts: wireless quantum encryption over very long distances just got a step closer. Quantum communication relies on sending entangled photons, each carrying a bit of information. It is secure because it will be obvious if anyone intercepts the photons, since doing so will disrupt the entanglement. Safely received bits are then used as a key to encrypt further communications. The furthest a quantum key has been sent through free space is 144 kilometres (New Scientist, 9 June 2007,