[1]http://www.dailymail.co.uk/sciencetech/article-3720772/China-launch-
   unbreakable-quantum-spy-satellite-say-one-day-lead-megascope-size-Earth
   -spot-license-plate-Jupiter-s-moons.html
   [quote]

China to launch unbreakable quantum spy satellite - and it could one day lead
to a megascope the size of Earth that could 'spot a license plate on
Jupiter's moons'

     * Satellite produces entangled photon pairs which form an encryption
       key
     * These photons will theoretically remain linked over great distances
     * This means that any attempts to listen in will be detected on the
       other side
     * Scientists say this could one day make for a secure global network

   Scientists in China are set to launch the world’s first ‘quantum
   satellite,’ which could one day make for an ultra-secure global
   communications network.
   The 1,300 pound craft contains a crystal that produces pairs of
   entangled photons, which will be fired to ground stations in China and
   Austria to form a ‘secret key.’
   Entangled photons theoretically maintain their link across any
   distance, and according to the scientists, any attempts to breach this
   type of communication would be easily detectable.
   [end of portion quoted]
                      Jim Bell
   (I have big questions about some of these statements in this article.
   But given the subject matter, quantum entanglement, confusion by lay
   individuals is to be expected.)

References

   1. http://www.dailymail.co.uk/sciencetech/article-3720772/China-launch-unbreakable-quantum-spy-satellite-say-one-day-lead-megascope-size-Earth-spot-license-plate-Jupiter-s-moons.html