Quantum crypto edges closer

British boffins have made a breakthrough in quantum cryptography, an advanced code-making technology which is theoretically uncrackable, by developing a single photon-emitting diode.

The researchers from the University of Cambridge and Toshiba have discovered a way of incorporating semiconductor nano-technology into an LED so they can trigger the emission of single photons at regulated times.

This is important because the security of optical quantum cryptography relies on sending a single photon carrying digital information between two parties exchanging encoded information.

The laws of quantum physics dictate that an eavesdropper could not measure the properties of a single photon without the risk of altering those properties. This means a legitimate receiver of a message can test whether it has been intercepted or altered by a hacker during transmission.

In contrast to methods based on codes, the keys formed by quantum cryptography can, in principle, be completely uncrackable.

News source: The Register - Quantum crypto edges closer

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