(Source: PhysOrg.com) A team from Austria’s Institute for Quantum Optics and Quantum Information (IQOQI) managed to send entangled photons 144 kilometres (90 miles) between the Spanish islands of Las Palmas and the Balearics using satellites
Quantum cryptography is possible over a modern glass fibre net, but because of the high rate of transmission loss, this is limited to around 100 km. To realise future quantum communication networks on a global scale, satellite based systems must be developed and photons transmitted over optical free space distant from the ground.
More information:
http://www.nature.com/nphys/journal/vaop/ncurrent/abs/nphys1255.html
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