https://www.sciencedaily.com/releases/2018/07/180716114602.htm > The team have developed a way of generating very rapid single-photon light pulses. Each photon, or particle of light, represents a bit of binary code -- the fundamental language of computing. These photons cannot be intercepted without disturbing them in a way that would alert the sender that something was amiss. > Transferring data using light passed along fibre optic cables has become increasingly common over the past decades, but each pulse currently contains millions of photons. That means that, in principle, a portion of these could be intercepted without detection.