28 May '14, 4pm

Quantum Cryptography with Ordinary Equipment

Researchers in Japan have come up with a way of doing quantum cryptography that could overcome two of the technology's big problems. The new protocol is designed to work with off-the-shelf equipment and use less bandwidth than existing methods. It’s just a mathematical proposal, but it could help make quantum key distribution more commercially viable. With an encrypted message, the sender and recipient share a key that unscrambles its contents. Ensuring that the key hasn't been stolen is the problem. With quantum cryptography , the key is created at the sender and receiver by transmitting photons over fiber-optic lines. The polarity of a photon—a quantum property that says whether it is oscillating vertically or at angle—can be determined by the receiver and compared with a second "entangled" photon created at the same time. The polarity of the photons is translated into b...

Full article: http://spectrum.ieee.org/tech-talk/computing/networks/qua...

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