Australian scientists make breakthrough in developing "unhackable" quantum internet

　　Photo taken on Sept. 6, 2017 shows red fluorescence from the rare earth ions in an yttrium orthosilicate crystal interacting with a (yellow) laser beam in the Australian National University (ANU), Canberra. Australian scientists have made a significant breakthrough in developing an "unhackable" quantum internet, it was announced on Sept. 12. (Xinhua/ANU/Stuart Hay)