China plans to take 'hack-proof' quantum satellite technology to new heights

"China is planning new, cutting-edge quantum communications satellites. The satellite can

generate random but entangled pairs of photons, thus creating secret keys, which are distributed to two separate ground stations with detectors to measure the polarization of the incoming photons. Placing new quantum satellites in higher orbits, similar to those of GPS satellites, means they will have a greater view of Earth below than does Micius, which orbits at around 310 miles (500 km) above our planet, and will be visible to ground stations for longer periods of time. It also means Chinese scientists and engineers will need to be able to transmit the quantum keys accurately over much greater distances." Space.com