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From The Engineer:
What is claimed to be the first commercial communication network using unbreakable encryption has been demonstrated in Vienna by a team from Bristol University and 40 other European institutions.
The technology is based on quantum cryptography — a technique that continually and randomly generates new encryption keys (codes) based on a stream of single photons emitted by a laser.
Photons have electrical fields that vibrate in different directions. The direction indicates a binary value, meaning photons are encoded with a value of 0 or 1.
The network, developed in the EU-funded SECOQC project, is installed in a standard optical fibre communication ring provided by Siemens Österreich in Vienna.
Previous developments in quantum cryptography focused on point-to-point connections between one sender and one receiver.
Although these solutions are suitable for some applications, such as connecting two data centres in metropolitan areas, there are disadvantages.
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