Tuesday, 6 October 2015

Researchers Demonstrate Quantum Cryptography Over 100km

Researchers at Toshiba's Cambridge Research Lab have quantum cryptography secure data over a distance of 100 kilometers knowledge exchange, which is a new record. The exchange took place over a single cable with a speed of 200 gigabits per second.

Quantum cryptography is a technique in which the encryption of information is performed with the aid of light, or photons. A zero or one is represented by a single light particle. At the level of single particles governed by the laws of quantum mechanics. That means that if the encrypted message is tapped, the contents of the message changes automatically.

A problem with quantum cryptography is the so-called "cross-talk", which provides a signal on one channel for problems in a different channel. The normal encoded data bits are shown in quantum cryptography by millions of photons, while the bits of the quantum key are received through a single photon. Dispersion of light makes detecting these key photons difficult, says researcher Andrew Shields opposite Electronics Weekly.

Because of the light in certain ways to filter the researchers succeeded in order to identify the key. The next step in the research is to build a network in order to demonstrate end-to-end-quantum cryptography. Earlier this year, Toshiba already announced that it is in 2020 with a communication system is that makes use of quantum cryptography, and in theory, is not to eavesdrop.

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