Free-space quantum communication achieved over 144 km

July 2007
Laser Focus World;Jul2007, Vol. 43 Issue 7, p11
The article reports on the result of the free-space quantum-communication experiment carried out in the Canary Islands. It has achieved a quantum-key distribution over a 144 km distance, an order of magnitude longer than the previous record. A high-power ultraviolet-laser-pumped downconverting beta-barium-borate-crystal source and optics to produce polarization-entangled photon pairs were found in a free-space link set-up between the islands of La Palma and Tenerife.


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