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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.
Read the whole article
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