Doctor Rose Ahlefeldt (L) and Associate Professor Matthew Sellars try to operate a high resolution dye laser, which they use to study rare earth crystals in the Australian National University (ANU), Canberra, on Sept. 6, 2017. Australian scientists have made a significant breakthrough in developing an "unhackable" quantum internet, it was announced on Sept. 12. (Xinhua/ANU/Stuart Hay)
